A zinc-nickel battery positive electrode and preparation method thereof

Abstract

The present invention belongs to the field of alkaline zinc-nickel secondary batteries and discloses a positive electrode for zinc-nickel secondary batteries, its preparation method, and application. The positive electrode is prepared from a slurry containing water, an active substance, zinc powder, a metal compound additive, a highly conductive activated carbon material, a positive electrode additive, and a binder mixed in a certain proportion, and nickel foam. The slurry is coated using a slurry pulling method. This preparation method is simple, efficient, and highly flexible, making it conducive to large-scale production. Furthermore, the highly conductive cobalt oxide and the highly conductive activated carbon material in the zinc-nickel battery positive electrode formula provided by the present invention form an excellent conductive network, effectively increasing battery capacity and improving the stability of the positive electrode.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and in particular relates to a zinc-nickel battery positive electrode and a preparation method thereof. Background Art

[0002] As the contribution of electric vehicles to vehicle driving increases, the demand for battery energy increases significantly, especially for full hybrid and plug-in hybrid vehicles, which impose stricter standards on battery energy.

[0003] Nickel-zinc batteries are environmentally friendly aqueous batteries with advantages such as abundant raw material resources, high energy density, simple production processes, and a virtually pollution-free manufacturing process. They are suitable for applications in renewable energy generation, electric vehicles, and emergency power supplies. However, due to limited cycle life and the difficulty in realizing their high specific energy potential, nickel-zinc batteries still have significant room for improvement. Cathode additives can effectively enhance the performance of nickel-zinc batteries. Selecting the right additives can produce high-energy, highly stable nickel-zinc cathodes.

[0004] The active material in the positive electrode of zinc-nickel batteries is nickel oxyhydroxide or nickel hydroxide, which has poor conductivity. This will lead to a significant increase in polarization during battery cycling. In addition, the phase change of the active material during charge and discharge will affect its own stability, thereby affecting the battery capacity and life. Therefore, it is crucial to find ways to improve its conductivity, build an efficient conductive network, and enhance the stability of the positive electrode.

[0005] Traditional batteries use cobalt compounds such as cobalt, cobalt oxide, and cobalt hydroxide as cathode additives to increase conductivity and battery capacity. However, traditional cobalt oxides, such as cobaltous oxide, are not very conductive. Furthermore, excessive addition can lead to the formation of cobalt dendrites in the cathode, which can significantly reduce battery life.

[0006] Rare earth additives are also considered to be an effective additive to improve the stability of the positive electrode, but the cost is also a problem worth considering (see the Chinese patent publication number CN111463434A, invention name "High specific energy zinc nickel battery positive electrode").

[0007] Overall, this field urgently needs to develop a zinc-nickel battery positive electrode and its preparation method to reduce the cost of the positive electrode, improve the electrochemical activity, and enhance the potential for commercialization. Summary of the Invention

[0008] In order to address the deficiencies and shortcomings of the above-mentioned prior art, the present invention aims to provide a zinc-nickel battery positive electrode and a preparation method thereof, using a conductive agent, a positive electrode additive, and highly conductive cobalt tetroxide to replace ordinary cobalt and its compounds in traditional batteries to form an excellent conductive network. In addition, compared with non-metallic materials, the conductive network formed by metals and metal compounds also has excellent electrochemical activity, and the cost is significantly reduced relative to rare earth additives, which has commercial potential.

[0009] The technical solutions adopted in the present invention are as follows:

[0010] A zinc-nickel battery positive electrode comprises the following components in parts by weight:

[0011] 50-60 parts active substance

[0012] Conductive agent zinc powder 0.3-3 parts

[0013] 0.1-0.2 parts of metal compound additives

[0014] 8-15 parts of positive electrode additives

[0015] Highly conductive activated carbon material 1~4

[0016] 4.2-5 parts of binder

[0017] The active material includes nickel hydroxide;

[0018] The metal compound additive is selected from one or more of barium hydroxide, magnesium hydroxide, and calcium hydroxide;

[0019] The positive electrode additive is nickel powder and highly conductive cobalt oxide, or nickel powder and bismuth oxide, wherein the weight ratio of nickel powder to highly conductive cobalt oxide is 7-10:0.1-0.4, and the weight ratio of nickel powder to bismuth oxide is 2-6:8-10;

[0020] The highly conductive activated carbon material is one or more of XC72 conductive carbon black, superP, graphite, graphene, and carbon nanotubes with a high specific area and a porous or lamellar shape;

[0021] The binder is selected from a composite binder of an organic polymer binder rich in hydroxyl and carboxyl groups and polytetrafluoroethylene (PTFE). The organic polymer binder rich in hydroxyl and carboxyl groups is binder component 1, and polytetrafluoroethylene (PTFE) is binder component 2.

[0022] Preferably, the binder component 1 is selected from one or more of hydroxyethyl cellulose HEC, hydroxyethyl methyl cellulose MHEC, carboxymethyl cellulose CMC or potassium polyacrylate PAAK; the binder component 2 is a polytetrafluoroethylene (PTFE) aqueous solution with a PTFE solid content of 60%.

[0023] Preferably, the mass ratio of the binder component 1 to the binder component 2 is (0.1-2):(3-5).

[0024] Preferably, the nickel powder is ball chain-shaped T255 nickel powder.

[0025] Preferably, the metal compound additive is barium hydroxide.

[0026] Preferably, the highly conductive cobalt oxide is Co3O4.

[0027] A method for preparing the above-mentioned zinc-nickel battery positive electrode is characterized by comprising the following steps:

[0028] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0029] (2) Wet material preparation: the metal compound additive is added to deionized water and stirred to dissolve, and then the binder component 1 is dissolved therein to obtain a translucent viscous liquid without particles;

[0030] (3) Slurry preparation: The dry material in step (1) is slowly added to the viscous liquid in step (2) at a stirring speed of 800-1000 r / min in a mixer, and the highly conductive activated carbon material and the conductive agent are slowly added thereto after stirring for 20-40 minutes. Finally, the binder component 2 is added, and the stirring speed is reduced to 400-600 r / min. The stirring is continued for 10-30 minutes to obtain a uniform slurry;

[0031] (4) Pole coating process: coating the slurry in step (3) onto the nickel foam;

[0032] (5) The coated electrode is placed in an oven for high-temperature heat treatment, rolled by a roller press, cut, welded to the electrode tab and the extended electrode tab, and coated with a diaphragm to obtain a positive electrode for a zinc-nickel battery.

[0033] Preferably, the electrode coating process is specifically as follows: pre-leaving a blank on the nickel foam with high temperature glue, with a blank width of 6-10 mm, then pouring the slurry into the slurry bucket, and immersing the nickel foam in the slurry, and pulling the slurry around the roller, applying a certain pulling force to the front and back of the nickel foam during the slurry pulling and coating, and controlling the slurry pulling speed to be 1-1.5 m / min, and then allowing the nickel foam to be scraped and integrated with the coated slurry through a scraper;

[0034] and / or,

[0035] The step (5) is specifically as follows: placing the coated electrode piece in an oven at 140-180°C for high temperature heat treatment for 1-4h, and finally rolling it with a roller press at 0.40-0.60mm, and then cutting the electrode piece according to the size and shape; cutting the nickel-plated steel sheet that is easy to weld into a certain shape, and then welding it to the blank area of ​​the foam nickel on the electrode piece with a spot welder, and then welding the nickel electrode with the electrode ear glue to the electrode ear with a spot welder, and finally covering the electrode piece with a PE non-woven fabric diaphragm, and using a hot press to heat-seal the diaphragm to prepare the zinc-nickel battery positive electrode.

[0036] A zinc-nickel battery positive electrode is prepared by the above-mentioned preparation method.

[0037] A zinc-nickel battery is characterized by being assembled from the above-mentioned zinc-nickel battery positive electrode and zinc-nickel battery negative electrode.

[0038] The beneficial effects of the present invention are as follows:

[0039] (1) By adding a suitable binder and further optimizing the composition, the positive electrode active material can maintain a suitable viscosity and uniform dispersion of the powder material when making the slurry, and improve the bonding strength of the positive electrode active material on the nickel foam. It can also reduce the softening and shedding of the active material caused by volume expansion and contraction during the charge and discharge process, that is, enhance the bonding strength between the active materials and between the active materials and the nickel foam matrix, thereby improving the mechanical strength of the positive electrode.

[0040] (2) By adding metal compound additives, the preferred Ba(OH)2 has a larger solubility product in the electrolyte, thus playing a role in pore formation, improving the transmission channel of ions between the solid and liquid phases, reducing the polarization degree of the nickel electrode, and improving the utilization rate of the positive electrode active material, thereby increasing the discharge capacity and improving the electrode cycle stability. In addition, the added zinc powder can not only improve the conductivity but also play a role in pore formation. The synergistic effect of barium hydroxide and zinc powder further improves the performance of the electrode.

[0041] (3) By adding positive electrode additives, the conductive properties of the electrode are improved and the charge and discharge efficiency is improved. Among them, the nickel powder is preferably a three-dimensional ball chain T255 nickel powder, which can effectively increase the effective conductive area. At the same time, the added high conductive cobalt oxide has rich oxygen defects and has a special Co 2+ With Co 3+ The distribution method makes its conductivity better than that of ordinary cobalt oxide. In addition, the added highly conductive activated carbon material with a porous or layered structure also has excellent electronic conductivity, which can further improve the conductivity of the electrode and improve the rate performance of the electrode;

[0042] (4) Through a specific order of adding materials, stirring speed and time control, slurry pulling method, and high-temperature heat treatment process, the electrode structure is stable and uniform, and the active material, conductive agent, and positive electrode additive are more closely combined with the substrate, thereby improving the cycle performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 This is a blank schematic diagram of nickel foam according to an embodiment of the present application;

[0045] Figure 2 This is a schematic diagram of the electrode coating process according to an embodiment of the present application;

[0046] Figure 3 This is a schematic diagram of the tab welding of an embodiment of the present application;

[0047] Figure 4 This is a picture of the pole piece in Example 1 of this application;

[0048] Figure 5 This is the pole piece picture of Example 13 of this application

[0049] Figure 6 The voltage, current-time diagram (Figure a) and CE-cycle number diagram (Figure b) of Example 1 of the present application under System 1 test;

[0050] Figure 7 The voltage, current-time diagram (Figure a) and CE-cycle number diagram (Figure b) of Example 9 of the present application under System 1 test;

[0051] Figure 8 The voltage, current-time diagram (Figure a) and the EE, CE-cycle number diagram (Figure b) of Example 1 of the present application under System 2;

[0052] Figure 9 The voltage, current-time diagram (Figure a) and the EE, CE-cycle number diagram (Figure b) of Example 9 of the present application under System 2 test;

[0053] Figure 10 The following is a comparison chart of the discharge specific capacity-cycle life of Example 1 of the present application and a commercially available electrode under system 3 test (Figure a) and a comparison chart of the discharge specific capacity retention rate-cycle number (Figure b);

[0054] Figure 11This is a graph showing the discharge specific capacity and discharge specific capacity retention rate versus cycle number for Example 9 of the present application under System 3;

[0055] Figure 12 This is a voltage-time diagram of the formation and capacity detection of Example 1 of the present application; DETAILED DESCRIPTION

[0056] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention and to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific implementation methods of the present invention are further described below.

[0057] The endpoints of the ranges and any values ​​disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0058] Example 1:

[0059] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, 0.12 parts of barium hydroxide as a metal compound, 9.09 parts of spherical chain T255 nickel powder as a positive electrode additive, 0.18 parts of Co3O4 as a highly conductive cobalt oxide, 2.23 parts of colloidal graphite as a highly conductive active carbon material, 1.279 parts of PVA (polyvinyl alcohol) as a binder, 3.48 parts of a PTFE aqueous solution (polytetrafluoroethylene) having a PTFE solid content of 60%, and 24.291 parts of deionized water.

[0060] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0061] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0062] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add PVA at a stirrer speed of 900 r / min, heat and stir until a translucent viscous liquid without particles is formed, and then cool;

[0063] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min in a mixer. After stirring for 30 min, colloidal graphite and zinc powder were slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added and the stirring speed was reduced to 500 r / min. The stirring was continued for 20 min to obtain a uniform slurry. The obtained slurry density was about 2.0 g / cm3.

[0064] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0065] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0066] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is coated with a PE non-woven fabric diaphragm and the diaphragm is heat-sealed using a hot press to prepare the electrode, as shown in FIG. Figure 4 shown.

[0067] The following examples and comparative examples are expressed in the same way.

[0068] The obtained positive electrode and zinc oxide negative electrode are assembled into a soft-pack zinc-nickel battery according to the existing zinc-nickel battery technology. Different systems are used to carry out cycle tests on the assembled soft-pack batteries. System 1 has an 8C discharge rate and a DOD of 8%. Table 4 shows the test steps of System 1; System 2 has a 0.8C discharge rate and a DOD of 56%. Table 5 shows the test steps of System 2; System 3 has a 0.72C discharge rate and a DOD of 100%. Table 6 shows the test steps of System 5. The formation processes of each system are the same, and the formation test system is shown in Table 2. In addition, the discharge capacity test system is described in Table 3. Figure 12This is a graph describing the formation capacity and the capacity detection discharge capacity voltage-time. The obtained positive electrode sheet load is 7.8g. The full battery cycles more than 3000 times under the test system 1, and stably cycles more than 420 times under the test system 2. Therefore, this embodiment has a high specific capacity and shows a high cycle life under different systems. In addition, we also provide the coulombic efficiency of the full battery under the test system 1 and the energy efficiency and coulombic efficiency under the test system 2. Among them, the average coulombic efficiency of the test system 1 is greater than 92%. Figure 6 The average energy efficiency and average coulombic efficiency under regime 2 are both greater than 85% and 99%, respectively. Figure 8 In addition, Figure 10 The assembled full battery has a discharge capacity of more than 225.3 mAh / g under the test system 3. In summary, we believe that this embodiment is one of the preferred examples. In addition, we also give the discharge capacity-cycle number of commercially available electrodes, such as Figure 10 As shown in the third test, the discharge capacity of the commercial electrode is only 156 mAh / g. After nearly 100 cycles, the full battery with the electrode of the present invention still has a discharge capacity of more than 161 mAh / g, while the commercial electrode has only 65 mAh / g. Therefore, the electrode of the present invention has superior performance compared to the commercial electrode.

[0069] Example 2:

[0070] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, 0.12 parts of barium hydroxide as a metal compound, 9.09 parts of spherical chain T255 nickel powder as a positive electrode additive, 0.18 parts of Co3O4 as a highly conductive cobalt oxide, 4 parts of colloidal graphite as a highly conductive active carbon material, 1.279 parts of PVA (polyvinyl alcohol) as a binder, 3.48 parts of a PTFE aqueous solution (polytetrafluoroethylene) having a PTFE solid content of 60%, and 22.521 parts of deionized water.

[0071] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0072] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0073] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add PVA at a stirrer speed of 900 r / min, heat and stir until a translucent viscous liquid without particles is formed, and then cool;

[0074] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min in a mixer. After stirring for 30 min, colloidal graphite and zinc powder were slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added and the stirring speed was reduced to 500 r / min. The stirring was continued for 20 min to obtain a uniform slurry. The obtained slurry density was about 2.0 g / cm3.

[0075] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0076] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0077] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0078] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. Cycling tests were conducted on the assembled soft-pack batteries using different cycle times. With an 8-gram positive electrode sheet loading, the positive electrode active material discharge capacity was 216.9 mAh / g. The full battery achieved over 2,500 stable cycles under cycle 1 and over 370 stable cycles under cycle 2.

[0079] Example 3:

[0080] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, 0.12 parts of barium hydroxide as a metal compound, 9.09 parts of spherical chain T255 nickel powder as a positive electrode additive, 0.18 parts of Co3O4 as a highly conductive cobalt oxide, 1 part of colloidal graphite as a highly conductive activated carbon material, 1.279 parts of PVA (polyvinyl alcohol) as a binder, 3.48 parts of a PTFE aqueous solution (polytetrafluoroethylene) having a PTFE solid content of 60%, and 25.521 parts of deionized water.

[0081] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0082] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0083] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add PVA at a stirrer speed of 900 r / min, heat and stir until a translucent viscous liquid without particles is formed, and then cool;

[0084] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min in a mixer. After stirring for 30 min, colloidal graphite and zinc powder were slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added and the stirring speed was reduced to 500 r / min. The stirring was continued for 20 min to obtain a uniform slurry. The obtained slurry density was about 2.0 g / cm3.

[0085] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0086] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0087] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0088] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. Cycling tests were conducted on the assembled soft-pack batteries using different cycle times. With a positive electrode loading of 7.9 grams, the positive electrode active material exhibited a specific discharge capacity of 210.2 mAh / g. The full battery achieved over 2500 stable cycles under cycle 1 and over 370 stable cycles under cycle 2.

[0089] Example 4:

[0090] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, 0.12 parts of barium hydroxide as a metal compound, 9.09 parts of spherical chain T255 nickel powder as a positive electrode additive, 0.1 parts of Co3O4 as a highly conductive cobalt oxide, 2.23 parts of colloidal graphite as a highly conductive active carbon material, 1.279 parts of PVA (polyvinyl alcohol) as a binder, 3.48 parts of a PTFE aqueous solution (polytetrafluoroethylene) having a PTFE solid content of 60%, and 24.371 parts of deionized water.

[0091] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0092] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0093] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add PVA at a stirrer speed of 900 r / min, heat and stir until a translucent viscous liquid without particles is formed, and then cool;

[0094] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min in a mixer. After stirring for 30 min, colloidal graphite and zinc powder were slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added and the stirring speed was reduced to 500 r / min. The stirring was continued for 20 min to obtain a uniform slurry. The obtained slurry density was about 2.0 g / cm3.

[0095] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0096] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0097] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0098] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. Cycling tests were conducted on the assembled soft-pack batteries using different cycle times. With an 8.1-gram positive electrode loading, the positive electrode active material exhibited a specific discharge capacity of 211.3 mAh / g. The full battery achieved over 2,600 stable cycles under cycle 1 and over 380 stable cycles under cycle 2.

[0099] Example 5:

[0100] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, 0.12 parts of barium hydroxide as a metal compound, 9.09 parts of spherical chain T255 nickel powder as a positive electrode additive, 0.4 parts of Co3O4 as a highly conductive cobalt oxide, 2.23 parts of colloidal graphite as a highly conductive active carbon material, 1.279 parts of PVA (polyvinyl alcohol) as a binder, 3.48 parts of a PTFE aqueous solution (polytetrafluoroethylene) having a PTFE solid content of 60%, and 24.071 parts of deionized water.

[0101] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0102] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0103] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add PVA at a stirrer speed of 900 r / min, heat and stir until a translucent viscous liquid without particles is formed, and then cool;

[0104] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min in a mixer. After stirring for 30 min, colloidal graphite and zinc powder were slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added and the stirring speed was reduced to 500 r / min. The stirring was continued for 20 min to obtain a uniform slurry. The obtained slurry density was about 2.0 g / cm3.

[0105] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0106] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0107] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0108] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. Cycling tests were conducted on the assembled soft-pack batteries using different cycle times. With an 8-gram positive electrode sheet loading, the positive electrode active material discharge capacity was 214.7 mAh / g. The full battery achieved over 2,600 stable cycles under cycle 1 and over 380 stable cycles under cycle 2.

[0109] Example 6:

[0110] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, 0.12 parts of barium hydroxide as a metal compound, 9.09 parts of spherical chain T255 nickel powder as a positive electrode additive, 0.18 parts of Co3O4 as a highly conductive cobalt oxide, 2.23 parts of XC72 conductive carbon black as a highly conductive active carbon material, 1.279 parts of PVA (polyvinyl alcohol) as a binder, 3.48 parts of a PTFE aqueous solution (polytetrafluoroethylene) having a PTFE solid content of 60%, and 24.291 parts of deionized water.

[0111] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0112] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0113] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add PVA at a stirrer speed of 900 r / min, heat and stir until a translucent viscous liquid without particles is formed, and then cool;

[0114] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min in a mixer. After stirring for 30 min, colloidal graphite and zinc powder were slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added and the stirring speed was reduced to 500 r / min. The stirring was continued for 20 min to obtain a uniform slurry. The obtained slurry density was about 2.0 g / cm3.

[0115] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0116] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0117] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0118] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. Cycling tests were conducted on the assembled soft-pack batteries using different cycle times. With a positive electrode loading of 7.7 grams, the positive electrode active material had a specific discharge capacity of 213.5 mAh / g. The full battery achieved over 2500 stable cycles under cycle 1 and over 370 stable cycles under cycle 2.

[0119] Example 7:

[0120] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, 0.12 parts of barium hydroxide as a metal compound, 9.09 parts of spherical chain T255 nickel powder as a positive electrode additive, 0.18 parts of Co3O4 as a highly conductive cobalt oxide, 2.23 parts of graphene as a highly conductive active carbon material, 1.279 parts of PVA (polyvinyl alcohol) as a binder, 3.48 parts of a PTFE aqueous solution (polytetrafluoroethylene) having a PTFE solid content of 60%, and 24.291 parts of deionized water.

[0121] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0122] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0123] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add PVA at a stirrer speed of 900 r / min, heat and stir until a translucent viscous liquid without particles is formed, and then cool;

[0124] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min in a mixer, and graphene and zinc powder were slowly added thereto after stirring for 30 min. After continuing to stir evenly, the PTFE aqueous solution was added, and the stirring speed was reduced to 500 r / min. The stirring was continued for 20 min to finally obtain a uniform slurry, wherein the obtained slurry density was about 2.0 g / cm3;

[0125] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0126] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0127] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0128] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. The assembled soft-pack batteries were cycled using different test systems. With a positive electrode loading of 7.9 grams, the positive electrode active material had a specific discharge capacity of 215.5 mAh / g. The full battery achieved over 2500 stable cycles under test system 1 and over 370 stable cycles under test system 2.

[0129] Example 8:

[0130] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, 0.12 parts of barium hydroxide as a metal compound, 9.09 parts of spherical chain T255 nickel powder as a positive electrode additive, 0.18 parts of Co3O4 as a highly conductive cobalt oxide, 2.23 parts of carbon nanotubes as a highly conductive active carbon material, 1.279 parts of PVA (polyvinyl alcohol) as a binder, 3.48 parts of a PTFE aqueous solution (polytetrafluoroethylene) having a PTFE solid content of 60%, and 24.291 parts of deionized water.

[0131] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0132] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0133] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add PVA at a stirrer speed of 900 r / min, heat and stir until a translucent viscous liquid without particles is formed, and then cool;

[0134] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min in a stirrer. After stirring for 30 min, carbon nanotubes and zinc powder were slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added and the stirring speed was reduced to 500 r / min. The stirring was continued for 20 min to obtain a uniform slurry. The obtained slurry density was about 2.0 g / cm3.

[0135] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0136] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0137] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0138] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. Cycling tests were conducted on the assembled soft-pack batteries using different cycle times. With an 8-gram positive electrode sheet loading, the positive electrode active material discharge capacity was 214.6 mAh / g. The full battery achieved over 2,500 stable cycles under cycle 1 and over 370 stable cycles under cycle 2.

[0139] Example 9:

[0140] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, 0.12 parts of barium hydroxide as a metal compound, 9.09 parts of spherical chain T255 nickel powder as a positive electrode additive, 0.18 parts of Co3O4 as a highly conductive cobalt oxide, 2.23 parts of colloidal graphite as a highly conductive active carbon material, 1.279 parts of CMC (carboxymethyl cellulose) as a binder, 3.48 parts of a PTFE aqueous solution (polytetrafluoroethylene) having a PTFE solid content of 60%, and 24.291 parts of deionized water.

[0141] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0142] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0143] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add CMC at a stirrer speed of 900 r / min and stir until a translucent viscous liquid without particles is formed;

[0144] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min in a mixer. After stirring for 30 min, colloidal graphite and zinc powder were slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added and the stirring speed was reduced to 500 r / min. The stirring was continued for 20 min to obtain a uniform slurry. The obtained slurry density was about 2.0 g / cm3.

[0145] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0146] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0147] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0148] The obtained positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery according to existing zinc-nickel battery technology. The assembled soft-pack battery was cycled using different systems. The positive electrode sheet was loaded with 8.2 grams, and the discharge capacity of the positive electrode active material was 227.0 mAh / g. Figure 10 The discharge capacity and retention rate under the third test cycle are shown in the graph. After 90 cycles, the discharge capacity is still greater than 161mAh / g. Under the first test of the full battery, the stable cycle time is more than 3000, and the coulombic efficiency is greater than 91%. Figure 7 As shown in the figure. Under the second system test, the stable cycle exceeds 420 cycles, and the energy efficiency and coulomb efficiency are higher than 84% and 99% respectively. Figure 9 shown.

[0149] Example 10:

[0150] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, 0.12 parts of barium hydroxide as a metal compound, 9.09 parts of spherical chain T255 nickel powder as a positive electrode additive, 0.18 parts of Co3O4 as a highly conductive cobalt oxide, 2.23 parts of colloidal graphite as a highly conductive activated carbon material, 1.279 parts of PAAK (potassium polyacrylate) as a binder, 3.48 parts of a PTFE aqueous solution (polytetrafluoroethylene) having a PTFE solid content of 60%, and 24.291 parts of deionized water.

[0151] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0152] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0153] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add PAAK at a stirrer speed of 900 r / min and stir until a translucent viscous liquid without particles is formed;

[0154] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min in a mixer. After stirring for 30 min, colloidal graphite and zinc powder were slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added and the stirring speed was reduced to 500 r / min. The stirring was continued for 20 min to obtain a uniform slurry. The obtained slurry density was about 2.0 g / cm3.

[0155] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0156] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0157] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0158] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. Cycling tests were conducted on the assembled soft-pack batteries using different cycle times. With an 8-gram positive electrode sheet loading, the specific discharge capacity of the positive electrode active material was 211.1 mAh / g. The full battery achieved over 2400 stable cycles under cycle 1 and over 340 stable cycles under cycle 2.

[0159] Example 11:

[0160] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 50 parts of cobalt-coated spherical nickel hydroxide, a conductive agent, 1.24 parts of zinc powder, a metal compound, preferably 0.12 parts of barium hydroxide, a positive electrode additive, preferably 9.09 parts of spherical chain T255 nickel powder, and a highly conductive cobalt oxide, preferably 0.18 parts of Co3O4, a highly conductive activated carbon material, preferably 2.23 parts of colloidal graphite, a binder, preferably 1.279 parts of PVA (polyvinyl alcohol), and a PTFE aqueous solution (polytetrafluoroethylene) having a PTFE solid content of 60%, and 32.381 parts of deionized water.

[0161] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0162] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0163] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add PVA at a stirrer speed of 900 r / min, heat and stir until a translucent viscous liquid without particles is formed, and then cool;

[0164] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min in a mixer. After stirring for 30 min, colloidal graphite and zinc powder were slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added and the stirring speed was reduced to 500 r / min. The stirring was continued for 20 min to obtain a uniform slurry. The obtained slurry density was about 2.0 g / cm3.

[0165] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0166] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0167] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0168] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. Cycling tests were conducted on the assembled soft-pack batteries using different cycle times. With a positive electrode loading of 7.6 grams, the positive electrode active material exhibited a specific discharge capacity of 206.9 mAh / g. The full battery achieved over 2,300 stable cycles under cycle 1 and over 330 stable cycles under cycle 2.

[0169] Example 12:

[0170] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 60 parts of cobalt-coated spherical nickel hydroxide, a conductive agent, 1.24 parts of zinc powder, a metal compound, preferably 0.12 parts of barium hydroxide, a positive electrode additive, preferably 9.09 parts of spherical chain T255 nickel powder, and a highly conductive cobalt oxide, preferably 0.18 parts of Co3O4, a highly conductive active carbon material, preferably 2.23 parts of colloidal graphite, a binder, preferably 1.279 parts of PVA (polyvinyl alcohol), and a PTFE aqueous solution (polytetrafluoroethylene) having a PTFE solid content of 60%, and 22.381 parts of deionized water.

[0171] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0172] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0173] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add PVA at a stirrer speed of 900 r / min, heat and stir until a translucent viscous liquid without particles is formed, and then cool;

[0174] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min in a mixer. After stirring for 30 min, colloidal graphite and zinc powder were slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added and the stirring speed was reduced to 500 r / min. The stirring was continued for 20 min to obtain a uniform slurry. The obtained slurry density was about 2.0 g / cm3.

[0175] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0176] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0177] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0178] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. Cycling tests were conducted on the assembled soft-pack batteries using different cycle times. With a positive electrode loading of 7.8 grams, the specific discharge capacity of the positive electrode active material was 207.8 mAh / g. The full battery achieved over 2,300 stable cycles under cycle 1 and over 330 stable cycles under cycle 2.

[0179] Example 13:

[0180] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, 0.12 parts of barium hydroxide as a metal compound, 4 parts of spherical chain T255 nickel powder and 9 parts of bismuth oxide as positive electrode additives, 2.23 parts of colloidal graphite as a highly conductive active carbon material, 1.279 parts of PVA (polyvinyl alcohol) as a binder, 3.48 parts of a PTFE aqueous solution (polytetrafluoroethylene) having a PTFE solid content of 60%, and 20.561 parts of deionized water.

[0181] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0182] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0183] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add PVA at a stirrer speed of 900 r / min, heat and stir until a translucent viscous liquid without particles is formed, and then cool;

[0184] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min. After stirring for 30 min, colloidal graphite and zinc powder were slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added. The stirring speed was maintained at 900 r / min and the stirring was continued for 20 min to finally obtain a uniform slurry with a slurry density of about 2.0 g / cm3.

[0185] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0186] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0187] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is coated with a PE non-woven fabric diaphragm and the diaphragm is heat-sealed using a hot press to prepare the electrode, as shown in FIG. Figure 5 shown.

[0188] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. Cycling tests were conducted on the assembled soft-pack batteries using different cycle times. With an 8.4-gram positive electrode sheet loading, the positive electrode active material exhibited a specific discharge capacity of 218.3 mAh / g. The full battery achieved over 2,600 stable cycles under cycle 1 and over 370 stable cycles under cycle 2.

[0189] Comparative Example 1:

[0190] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, a metal compound, preferably 0.12 parts of barium hydroxide, a positive electrode additive, preferably 9.09 parts of spherical chain T255 nickel powder, and a highly conductive cobalt oxide, preferably 0.18 parts of Co3O4, a highly conductive active carbon material, preferably 2.23 parts of colloidal graphite, a binder, preferably 1.279 parts of PVA (polyvinyl alcohol), and a PTFE aqueous solution (polytetrafluoroethylene) having a PTFE solid content of 60%, and 25.531 parts of deionized water.

[0191] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0192] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0193] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add PVA at a stirrer speed of 900 r / min, heat and stir until a translucent viscous liquid without particles is formed, and then cool;

[0194] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min in a stirrer. After stirring for 30 min, colloidal graphite was slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added and the stirring speed was reduced to 500 r / min. Stirring was continued for 20 min to obtain a uniform slurry. The obtained slurry density was about 2.0 g / cm3.

[0195] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0196] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0197] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0198] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. Cycling tests were conducted on the assembled soft-pack batteries using different cycle times. With an 8-gram positive electrode sheet loading, the positive electrode active material had a specific discharge capacity of 20.2 mAh / g. The full battery achieved over 2,100 stable cycles under cycle 1 and over 300 stable cycles under cycle 2.

[0199] Comparative Example 2:

[0200] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, 0.12 parts of barium hydroxide as a metal compound, 9.09 parts of spherical chain-shaped T255 nickel powder and 0.18 parts of highly conductive cobalt oxide, preferably Co3O4, as a positive electrode additive, 1.279 parts of PVA (polyvinyl alcohol) as a binder, 3.48 parts of a PTFE aqueous solution (polytetrafluoroethylene) having a PTFE solid content of 60%, and 26.521 parts of deionized water.

[0201] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0202] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0203] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add PVA at a stirrer speed of 900 r / min, heat and stir until a translucent viscous liquid without particles is formed, and then cool;

[0204] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min in a stirrer. After stirring for 30 min, the PTFE aqueous solution was slowly added thereto, and the stirring speed was reduced to 500 r / min. The stirring was continued for 20 min to obtain a uniform slurry. The obtained slurry density was about 2.0 g / cm3.

[0205] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0206] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0207] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0208] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. The assembled soft-pack batteries were cycled using different test systems. With an 8.1-gram positive electrode loading, the positive electrode active material exhibited a specific discharge capacity of 202.7 mAh / g. The full battery achieved over 2,000 stable cycles under test system 1 and over 280 stable cycles under test system 2.

[0209] Comparative Example 3:

[0210] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, a positive electrode additive, preferably 9.09 parts of spherical chain T255 nickel powder and 0.18 parts of highly conductive cobalt oxide, preferably Co3O4, a highly conductive active carbon material, preferably 2.23 parts of colloidal graphite, a binder, preferably 1.279 parts of PVA (polyvinyl alcohol), 3.48 parts of a PTFE aqueous solution (polytetrafluoroethylene) having a PTFE solid content of 60%, and 24.411 parts of deionized water.

[0211] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0212] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0213] (2) Wet material preparation: prepare the required deionized water, then slowly add PVA at a stirrer speed of 900 r / min, heat and stir until a translucent viscous liquid without particles is obtained, and then cool;

[0214] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min in a mixer. After stirring for 30 min, colloidal graphite and zinc powder were slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added and the stirring speed was reduced to 500 r / min. The stirring was continued for 20 min to obtain a uniform slurry. The obtained slurry density was about 2.0 g / cm3.

[0215] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0216] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0217] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0218] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. Cycling tests were conducted on the assembled soft-pack batteries using different cycle times. With an 8-gram positive electrode sheet loading, the positive electrode active material discharge capacity was 203.3 mAh / g. The full battery achieved over 2,300 stable cycles under cycle 1 and over 320 stable cycles under cycle 2.

[0219] Comparative Example 4:

[0220] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, 0.12 parts of barium hydroxide as a metal compound, 0.18 parts of highly conductive cobalt oxide Co3O4 as a positive electrode additive, 2.23 parts of colloidal graphite as a highly conductive active carbon material, 1.279 parts of PVA (polyvinyl alcohol) as a binder, 3.48 parts of a PTFE aqueous solution (polytetrafluoroethylene) with a PTFE solid content of 60%, and 33.321 parts of deionized water.

[0221] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0222] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0223] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add PVA at a stirrer speed of 900 r / min, heat and stir until a translucent viscous liquid without particles is formed, and then cool;

[0224] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min in a mixer. After stirring for 30 min, colloidal graphite and zinc powder were slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added and the stirring speed was reduced to 500 r / min. The stirring was continued for 20 min to obtain a uniform slurry. The obtained slurry density was about 2.0 g / cm3.

[0225] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0226] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0227] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0228] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. Cycling tests were conducted on the assembled soft-pack batteries using different cycle times. With a positive electrode loading of 7.6 grams, the specific discharge capacity of the positive electrode active material was 201.2 mAh / g. The full battery achieved over 1800 stable cycles under cycle 1 and over 250 stable cycles under cycle 2.

[0229] Comparative Example 5:

[0230] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, 0.12 parts of barium hydroxide as a metal compound, 9.09 parts of spherical chain-shaped T255 nickel powder as a positive electrode additive, 2.23 parts of colloidal graphite as a highly conductive active carbon material, 1.279 parts of PVA (polyvinyl alcohol) as a binder, 3.48 parts of a PTFE aqueous solution (polytetrafluoroethylene) with a PTFE solid content of 60%, and 24.371 parts of deionized water.

[0231] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0232] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0233] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add PVA at a stirrer speed of 900 r / min, heat and stir until a translucent viscous liquid without particles is formed, and then cool;

[0234] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min in a mixer. After stirring for 30 min, colloidal graphite and zinc powder were slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added and the stirring speed was reduced to 500 r / min. The stirring was continued for 20 min to obtain a uniform slurry. The obtained slurry density was about 2.0 g / cm3.

[0235] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0236] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0237] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0238] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. Cycling tests were conducted on the assembled soft-pack batteries using different cycle times. With a positive electrode loading of 7.9 grams, the positive electrode active material exhibited a specific discharge capacity of 203.5 mAh / g. The full battery achieved over 2500 stable cycles under cycle 1 and over 370 stable cycles under cycle 2.

[0239] Comparative Example 6:

[0240] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, 0.12 parts of barium hydroxide as a metal compound, 9.09 parts of spherical chain T255 nickel powder and 0.18 parts of highly conductive cobalt oxide, preferably Co3O4, as a positive electrode additive, 2.23 parts of colloidal graphite as a highly conductive activated carbon material, 3.48 parts of a PTFE aqueous solution (polytetrafluoroethylene) with a 60% solid content of PTFE as a binder, and 25.57 parts of deionized water.

[0241] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0242] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0243] (2) Wet material preparation: Add the metal compound into deionized water and stir to dissolve;

[0244] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min in a mixer. After stirring for 30 min, colloidal graphite and zinc powder were slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added and the stirring speed was reduced to 500 r / min. The stirring was continued for 20 min to obtain a uniform slurry. The obtained slurry density was about 1.9 g / cm3.

[0245] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0246] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0247] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0248] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. Cycling tests were conducted on the assembled soft-pack batteries using different cycle times. With a positive electrode loading of 7.1 grams, the specific discharge capacity of the positive electrode active material was 203.6 mAh / g. The full battery achieved over 2000 stable cycles under cycle 1 and over 270 stable cycles under cycle 2.

[0249] Comparative Example 7:

[0250] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, 0.12 parts of barium hydroxide as a metal compound, 9.09 parts of spherical chain T255 nickel powder as a positive electrode additive, and 0.18 parts of highly conductive cobalt oxide, preferably Co3O4, as a highly conductive activated carbon material, preferably 2.23 parts of colloidal graphite, 1.279 parts of PVA (polyvinyl alcohol) as a binder, and 27.771 parts of deionized water.

[0251] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0252] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0253] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add PVA at a stirrer speed of 900 r / min, heat and stir until a translucent viscous liquid without particles is formed, and then cool;

[0254] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min in a mixer. After stirring for 30 min, colloidal graphite and conductive agent zinc powder were slowly added thereto. Stirring was continued for 20 min to obtain a uniform slurry. The obtained slurry density was about 1.9 g / cm3.

[0255] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0256] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0257] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0258] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. Cycling tests were conducted on the assembled soft-pack batteries using different cycle times. With a positive electrode loading of 7.1 grams, the specific discharge capacity of the positive electrode active material was 203.6 mAh / g. The full battery achieved over 2000 stable cycles under cycle 1 and over 270 stable cycles under cycle 2.

[0259] Comparative Example 8:

[0260] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, 0.12 parts of barium hydroxide as a metal compound, 9.09 parts of spherical chain T255 nickel powder as a positive electrode additive, 0.18 parts of Co3O4 as a highly conductive cobalt oxide, 2.23 parts of colloidal graphite as a highly conductive active carbon material, 1.279 parts of PVA (polyvinyl alcohol) as a binder, 3.48 parts of a PTFE aqueous solution (polytetrafluoroethylene) having a PTFE solid content of 60%, and 24.291 parts of deionized water.

[0261] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0262] (1) Mixing of dry materials: Active material, positive electrode additive, colloidal graphite, and zinc powder are mixed uniformly in a blender to prepare dry materials;

[0263] (2) Wet material preparation: The metal compound is added to deionized water and stirred to dissolve, and then PVA is slowly added at a stirrer speed of 900 r / min, heated and stirred until a translucent viscous liquid without particles is formed, and then cooled, wherein the mass fraction of PVA is 5%;

[0264] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min, and stirred until a uniform slurry was obtained, wherein the obtained slurry density was about 2.0 g / cm3;

[0265] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0266] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0267] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0268] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. Cycling tests were conducted on the assembled soft-pack batteries using different cycle times. With a positive electrode loading of 7.8 grams, the positive electrode active material exhibited a specific discharge capacity of 200.9 mAh / g. The full battery achieved over 2200 stable cycles under cycle 1 and over 280 stable cycles under cycle 2.

[0269] Comparative Example 9:

[0270] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, 0.12 parts of barium hydroxide as a metal compound, 9.09 parts of spherical chain T255 nickel powder as a positive electrode additive, 0.18 parts of Co3O4 as a highly conductive cobalt oxide, 2.23 parts of colloidal graphite as a highly conductive active carbon material, 1.279 parts of PVA (polyvinyl alcohol) as a binder, 3.48 parts of a PTFE aqueous solution (polytetrafluoroethylene) having a PTFE solid content of 60%, and 24.291 parts of deionized water.

[0271] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0272] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0273] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add PVA at a stirrer speed of 900 r / min, heat and stir until a translucent viscous liquid without particles is formed, and then cool;

[0274] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 500 r / min in a mixer. After stirring for 30 min, colloidal graphite and zinc powder were slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added. The stirring speed was maintained at 500 r / min and the stirring was continued for 20 min to finally obtain a uniform slurry with a slurry density of about 2.0 g / cm3.

[0275] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0276] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0277] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0278] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. Cycling tests were conducted on the assembled soft-pack batteries using different cycle times. With an 8-gram positive electrode sheet loading, the specific discharge capacity of the positive electrode active material was 209.5 mAh / g. The full battery achieved over 2,300 stable cycles under cycle 1 and over 300 stable cycles under cycle 2.

[0279] Comparative Example 10:

[0280] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, 0.12 parts of barium hydroxide as a metal compound, 9.09 parts of spherical chain T255 nickel powder as a positive electrode additive, 0.18 parts of Co3O4 as a highly conductive cobalt oxide, 2.23 parts of colloidal graphite as a highly conductive active carbon material, 1.279 parts of PVA (polyvinyl alcohol) as a binder, 3.48 parts of a PTFE aqueous solution (polytetrafluoroethylene) having a PTFE solid content of 60%, and 24.291 parts of deionized water.

[0281] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0282] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0283] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add PVA at a stirrer speed of 900 r / min, heat and stir until a translucent viscous liquid without particles is formed, and then cool;

[0284] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min. After stirring for 30 min, colloidal graphite and zinc powder were slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added. The stirring speed was maintained at 900 r / min and the stirring was continued for 20 min to finally obtain a uniform slurry with a slurry density of about 2.0 g / cm3.

[0285] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0286] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 160°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0287] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0288] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. Cycling tests were conducted on the assembled soft-pack batteries using different cycle times. With an 8-gram positive electrode sheet loading, the specific discharge capacity of the positive electrode active material was 210.4 mAh / g. The full battery achieved over 2400 stable cycles under cycle 1 and over 300 stable cycles under cycle 2.

[0289] Comparative Example 11:

[0290] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, 0.12 parts of barium hydroxide as a metal compound, 9.09 parts of spherical chain T255 nickel powder as a positive electrode additive, 0.18 parts of Co3O4 as a highly conductive cobalt oxide, 2.23 parts of colloidal graphite as a highly conductive active carbon material, 1.279 parts of PVA (polyvinyl alcohol) as a binder, 3.48 parts of a PTFE aqueous solution (polytetrafluoroethylene) having a PTFE solid content of 60%, and 24.291 parts of deionized water.

[0291] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0292] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0293] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add PVA at a stirrer speed of 900 r / min, heat and stir until a translucent viscous liquid without particles is formed, and then cool;

[0294] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min. After stirring for 30 min, colloidal graphite and zinc powder were slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added. The stirring speed was reduced to 500 r / min and stirring was continued for 20 min to obtain a uniform slurry. The obtained slurry density was about 2.0 g / cm3.

[0295] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0296] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 200°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The size of the active material coating area is 9.4 cm × 7.7 cm;

[0297] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0298] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. The assembled soft-pack batteries were cycled using different test cycles. With a positive electrode loading of 7.6 grams, the positive electrode active material had a specific discharge capacity of 206.9 mAh / g. The full battery achieved over 2,300 stable cycles under test cycle 1 and over 300 stable cycles under test cycle 2.

[0299] Comparative Example 12:

[0300] A zinc-nickel battery positive electrode with excellent stability comprises the following components in parts by weight: an active material, preferably 58.09 parts of cobalt-coated spherical nickel hydroxide, 1.24 parts of zinc powder as a conductive agent, 0.12 parts of barium hydroxide as a metal compound, 9.09 parts of spherical chain T255 nickel powder as a positive electrode additive, 0.18 parts of Co3O4 as a highly conductive cobalt oxide, 2.23 parts of colloidal graphite as a highly conductive active carbon material, 1.279 parts of PVA (polyvinyl alcohol) as a binder, 3.48 parts of a PTFE aqueous solution (polytetrafluoroethylene) having a PTFE solid content of 60%, and 24.291 parts of deionized water.

[0301] A method for preparing a positive electrode for a zinc-nickel battery with excellent stability comprises the following steps:

[0302] (1) Mixing of dry materials: The active material and the positive electrode additive are mixed evenly in a blender to prepare dry materials;

[0303] (2) Wet material preparation: Add the metal compound to deionized water and stir to dissolve, then slowly add PVA at a stirrer speed of 900 r / min, heat and stir until a translucent viscous liquid without particles is formed, and then cool;

[0304] (3) Slurry preparation: The dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min. After stirring for 30 min, colloidal graphite and zinc powder were slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added. The stirring speed was maintained at 900 r / min and the stirring was continued for 20 min to finally obtain a uniform slurry with a slurry density of about 2.0 g / cm3.

[0305] (4) Pole coating process: the slurry in (3) is coated on the nickel foam. Specifically, the nickel foam is pre-treated with high temperature glue to leave a blank, and the blank width is 8mm. Figure 1 As shown. Then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. When pulling the slurry, a certain pulling force is applied to the front and back of the nickel foam, and the pulling speed is controlled to be 1.2m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; as shown. Figure 2 shown.

[0306] (5) Place the coated electrode into an oven for high-temperature heat treatment, and finally roll it through a roller press and cut it into electrode pieces; specifically: place the coated electrode into an oven for high-temperature heat treatment at 120°C for 2 hours, and finally roll it through a roller press with a thickness of 0.35mm, and then cut out the electrode pieces. The active material coating area size is 9.4 cm × 7.7 cm;

[0307] (6) Welding the tabs and extended tabs, diaphragm coating: Cut the nickel-plated steel sheet that is easy to weld into a certain shape, and weld it to the blank area of ​​the nickel foam on the electrode with a spot welder, such as Figure 3 As shown, the nickel tab with tab glue is then welded to the tab using a spot welder. Finally, the electrode is covered with a PE non-woven fabric diaphragm, and the diaphragm is heat-sealed using a hot press to prepare the electrode.

[0308] The resulting positive electrode and zinc oxide negative electrode were assembled into a soft-pack zinc-nickel battery using existing zinc-nickel battery technology. Cycling tests were conducted on the assembled soft-pack batteries using different cycle times. With a positive electrode loading of 7.8 grams, the specific discharge capacity of the positive electrode active material was 207.8 mAh / g. The full battery achieved over 2000 stable cycles under cycle 1 and over 280 stable cycles under cycle 2.

[0309] The differences between Examples 2-12 and Comparative Examples 1-10 compared to Example 1 are as follows:

[0310] Example 2: Compared with Example 1, the content of colloidal graphite is 4 parts;

[0311] Example 3: Compared with Example 1, the content of colloidal graphite is 1 part;

[0312] Example 4: Compared with Example 1, the content of Co3O4 is 0.1 parts;

[0313] Example 5: Compared with Example 1, the content of Co3O4 is 0.4 parts;

[0314] Example 6: Compared with Example 1, the highly conductive activated carbon material is XC72 conductive carbon black instead of colloidal graphite;

[0315] Example 7: Compared with Example 1, the highly conductive activated carbon material is graphene instead of colloidal graphite;

[0316] Example 8: Compared with Example 1, the highly conductive activated carbon material is replaced by carbon nanotubes instead of colloidal graphite;

[0317] Example 9: Compared with Example 1, PVA (polyvinyl alcohol) is replaced by CMC (carboxymethyl cellulose);

[0318] Example 10: Compared with Example 1, PVA (polyvinyl alcohol) is replaced with PAAK (potassium polyacrylate);

[0319] Example 11: Compared with Example 1, the content of cobalt-coated spherical nickel hydroxide is 50 parts;

[0320] Example 12: Compared with Example 1, the content of cobalt-coated spherical nickel hydroxide is 70 parts;

[0321] Example 13: Compared to Example 1, the positive electrode additives are 4 parts of nickel powder and 9 parts of bismuth oxide;

[0322] Comparative Example 1: Compared with Example 1, the zinc powder content is 0;

[0323] Comparative Example 2: Compared with Example 1, the content of highly conductive activated carbon material is 0;

[0324] Comparative Example 3: Compared with Example 1, the barium hydroxide content is 0:

[0325] Comparative Example 4: Compared with Example 1, the content of ball chain T255 nickel powder is 0:

[0326] Comparative Example 5: Compared with Example 1, the content of high-conductive cobalt oxide is 0;

[0327] Comparative Example 6: Compared with Example 1, the content of binder component 1 is 0;

[0328] Comparative Example 7: Compared with Example 2, the content of binder component 2 is 0;

[0329] Comparative Example 8: Compared with Example 1, all solid components were mixed in step (1);

[0330] Comparative Example 9: Compared with Example 1, in step (3) of the preparation method, the dry material of (1) was slowly added to the solution of (2) at a stirring speed of 500 r / min in a stirrer, and after stirring for 30 minutes, colloidal graphite and conductive agent zinc powder were slowly added thereto. After continuing to stir evenly, the PTFE aqueous solution was added, and the stirring speed was maintained at 500 r / min. Stirring was continued for 20 minutes to finally obtain a uniform slurry;

[0331] Comparative Example 10, compared with Example 1, in step (3) of the preparation method, the dry material of (1) was slowly added to the solution of (2) at a stirring speed of 900 r / min in a stirrer, and after stirring for 30 minutes, colloidal graphite and conductive agent zinc powder were slowly added thereto, and after continuing to stir evenly, the PTFE aqueous solution was added, and the stirring speed was maintained at 900 r / min, and stirring was continued for 20 minutes to finally obtain a uniform slurry;

[0332] In comparative example 11, compared with example 1, step (5) in the preparation method is: placing the coated electrode piece in an oven for high-temperature heat treatment, finally rolling it through a roller press, and cutting it into electrode pieces; specifically, placing the coated electrode piece in an oven for high-temperature heat treatment at 200°C for 2 hours, finally rolling it through a roller press with a thickness of 0.35mm, and then cutting out the electrode piece, and the active material coating area size is 9.4 cm × 7.7 cm;

[0333] In comparative example 12, compared with example 1, step (5) in the preparation method is: placing the coated electrode piece in an oven for high-temperature heat treatment, finally rolling it through a roller press, and cutting it into electrode pieces; specifically, placing the coated electrode piece in an oven for high-temperature heat treatment at 120°C for 2 hours, finally rolling it through a roller press at 0.35mm, and then cutting out the electrode piece, and the active material coating area size is 9.4 cm × 7.7 cm;

[0334] The electrode parameters and full battery capacity performance of the embodiments and comparative examples of the present application are shown in Table 1 below, the cycle performance of the full battery under different test systems is shown in Table 2, the full battery formation system table is shown in Table 3 below, the full battery capacity detection test system table is shown in Table 4 below, the test system of system 1 is shown in Table 5 below, the test system of system 2 is shown in Table 6 below, and the test system of system 3 is shown in Table 7 below.

[0335] Table 1. Table of pole piece parameters and full battery capacity performance of the embodiments and comparative examples of the present application

[0336] sample Pole load (g) Discharge capacity (mAh / g) Example 1 7.8 225.3 Example 2 8 216.9 Example 3 7.9 210.2 Example 4 8.1 211.3 Example 5 8 214.7 Example 6 7.7 213.5 Example 7 7.9 215.5 Example 8 8 214.6 Example 9 8.2 227.0 Example 10 8 211.1 Example 11 8.5 213.1 Example 12 8.6 215.1 Example 13 8.4 218.3 Comparative Example 1 8 208.2 Comparative Example 2 8.1 202.7 Comparative Example 3 8 203.3 Comparative Example 4 7.6 201.2 Comparative Example 5 7.9 203.5 Comparative Example 6 7.1 203.6 Comparative Example 7 7.2 206.2 Comparative Example 8 7.8 200.9 Comparative Example 9 8 209.5 Comparative Example 10 8 210.4 Comparative Example 11 7.6 206.9 Comparative Example 12 7.8 207.8

[0337] Table 2. Cycling performance of full batteries of the present embodiment and comparative example under different test systems

[0338]

[0339]

[0340] Table 3. Full battery formation test system

[0341] ID Process Test parameters Deadline 1 Constant current charging <![CDATA[0.248(mA / cm 2 )]]> Time ≥ 30 minutes 2 Let it sit 6min Time ≥ 6 minutes 3 Constant current charging <![CDATA[2.36(mA / cm 2 )]]> Voltage ≥ 1.95V or time ≥ 3h 4 Let it sit 6min Time ≥ 6 minutes 5 Constant current charging <![CDATA[1.19(mA / cm 2 )]]> Time ≥ 4 hours 6 Let it sit 6min Time ≥ 6 minutes 7 Constant current discharge <![CDATA[2.36(mA / cm 2 )]]> Voltage ≤ 1.4V 8 Let it sit 6min Time ≥ 6 minutes 9 Constant current charging <![CDATA[2.36(mA / cm 2 )]]> Voltage ≥ 1.95V or time ≥ 3.5h 10 Let it sit 6min Time ≥ 6 minutes 11 Constant current charging <![CDATA[1.19(mA / cm 2 )]]> Time ≥ 2 hours 12 Let it sit 6min Time ≥ 6 minutes 13 Constant current charging <![CDATA[0.99(mA / cm 2 )]]> Time ≥ 4 hours 14 Let it sit 6min Time ≥ 6 minutes 15 Constant current discharge <![CDATA[2.36(mA / cm 2 )]]> Voltage ≤ 1.4V 16 Let it sit 6min Time ≥ 6 minutes 17 Constant current charging <![CDATA[1.19(mA / cm 2 )]]> Time ≥ 3 hours 18 Let it sit 6min Time ≥ 6 minutes 19 Constant current charging <![CDATA[0.99(mA / cm 2 )]]> Time ≥ 6 hours 20 Let it sit 6min Time ≥ 6 minutes

[0342] Table 4. Full battery capacity test system

[0343]

[0344]

[0345] Table 5 System 1 Test System

[0346]

[0347] Table 6 System 2 test system table

[0348]

[0349] Table 7 System 3 test system table

[0350]

[0351]

[0352] The embodiments of the present invention are described in detail above, but the present invention is not limited to the described embodiments. It is apparent to those skilled in the art that various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and spirit of the present invention are still within the scope of protection of the present invention.

Claims

1. A method for preparing a positive electrode for a zinc-nickel battery, characterized in that: The nickel-zinc battery positive electrode comprises the following components in parts by weight: 50-60 parts of active substance; Conductive agent zinc powder 0.3-3 parts; 0.1-0.2 parts of metal compound additives; 8-15 parts of positive electrode additive; 1-4 parts of highly conductive activated carbon material; 4.2-5 parts of binder; The active material includes nickel hydroxide; The metal compound additive is selected from one or more of barium hydroxide, magnesium hydroxide, and calcium hydroxide; The positive electrode additive is nickel powder and highly conductive cobalt oxide, or nickel powder and bismuth oxide, wherein the weight ratio of nickel powder to highly conductive cobalt oxide is 7-10:0.1-0.4, and the weight ratio of nickel powder to bismuth oxide is 2-6:8-10; the highly conductive cobalt oxide is Co3O4; The highly conductive activated carbon material is one or more of super P, graphite, graphene, and carbon nanotubes with a porous or lamellar shape and a high specific surface area; The binder is selected from a composite binder of an organic polymer binder rich in hydroxyl and carboxyl groups and polytetrafluoroethylene (PTFE), wherein the organic polymer binder rich in hydroxyl and carboxyl groups is binder component 1, and the polytetrafluoroethylene (PTFE) is binder component 2; The binder component 1 is selected from one or more of polyvinyl alcohol (PVA), hydroxyethyl cellulose (HEC), hydroxyethyl methyl cellulose (MHEC), carboxymethyl cellulose (CMC) or potassium polyacrylate (PAAK); The method comprises the following steps: (1) Mixing of dry materials: Mix the active material and cathode additives evenly in a blender to obtain dry materials; (2) Wet material preparation: the metal compound additive is added to deionized water and stirred to dissolve, and then the binder component 1 is dissolved therein to obtain a translucent viscous liquid without particles; (3) Slurry preparation: The dry material in step (1) is slowly added to the viscous liquid in step (2) at a stirring speed of 800-1000 r / min in a mixer. After stirring for 20-40 min, the highly conductive activated carbon material and the conductive agent zinc powder are slowly added thereto. Finally, the binder component 2 is added, and the stirring speed is reduced to 400-600 r / min. The stirring is continued for 10-30 min to obtain a uniform slurry. (4) Pole coating process: coating the slurry in step (3) onto the nickel foam; (5) The coated electrode is placed in an oven for high-temperature heat treatment, rolled by a roller press, cut, welded to the electrode tab and extended electrode tab, and coated with a diaphragm to obtain a positive electrode for a zinc-nickel battery. The temperature of the high-temperature heat treatment is 140-180°C and the treatment time is 1-4 hours.

2. The method for preparing a positive electrode for a zinc-nickel battery according to claim 1, wherein: The mass ratio of the binder component 1 to the binder component 2 is (0.1-2):(3-5).

3. A method for preparing a positive electrode for a zinc-nickel battery according to claim 1 or 2, characterized in that: The binder component 2 is a polytetrafluoroethylene (PTFE) aqueous solution with a PTFE solid content of 60%.

4. A method for preparing a positive electrode for a zinc-nickel battery according to claim 1 or 2, characterized in that: The metal compound additive is barium hydroxide.

5. The method for preparing a positive electrode for a zinc-nickel battery according to claim 1, wherein: The electrode coating process is specifically as follows: pre-use high-temperature glue to leave a blank on the nickel foam, with a blank width of 6-10mm, then pour the slurry into the slurry bucket, immerse the nickel foam in the slurry, and pull the slurry around the roller. During the slurry coating, a certain pulling force is applied to the nickel foam front and back, and the slurry pulling speed is controlled to be 1-1.5m / min. Then, the nickel foam is scraped and integrated with the coated slurry by a scraper; and / or, The step (5) is specifically as follows: placing the coated electrode into an oven at 140-180°C for high temperature heat treatment for 1-4h, and finally rolling it with a roller press at 0.40-0.60mm, and then cutting the electrode into a size and shape; cutting the nickel-plated steel sheet that is easy to weld into a certain shape, and then welding it to the blank area of ​​the foam nickel on the electrode with a spot welder, and then welding the nickel electrode with the electrode glue to the electrode with a spot welder, and finally covering the electrode with a PE non-woven fabric diaphragm, and using a hot press to heat-seal the diaphragm to prepare the zinc-nickel battery positive electrode.

6. A zinc-nickel battery positive electrode, characterized in that: The positive electrode of a zinc-nickel battery is prepared by the method for preparing the positive electrode of a zinc-nickel battery according to any one of claims 1 to 5.

7. A zinc-nickel battery, characterized in that: The nickel-zinc battery is assembled from the positive electrode of claim 6 and the negative electrode of the nickel-zinc battery.

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