Electrolyte for improving floating performance of zinc-nickel battery, preparation method and application thereof

Abstract

This invention relates to an electrolyte for improving the float charging performance of zinc-nickel batteries, its preparation method, and its application. The electrolyte comprises the following raw materials by weight percentage: 25-50% alkali agent, 5-15% ZnO, 0.5-5% lithium salt, 0.1-5% boric acid and / or borate, 0.005-0.03% silicate, 0.01-0.5% surfactant, and 0.01-0.5% additives, with the balance being pure water. The additives are ammonium o-sulfobenzoate, 3-amino-1,2,4-triazole, and N-benzyloxycarbonyl-L-threonine. The additives of this invention, through the synergistic effect of the three components, effectively inhibit dendrite growth and hydrogen evolution corrosion of the zinc anode, significantly improving the cycle stability, safety, and service life of zinc-nickel batteries under float charging conditions.

Description

Technical Field

[0001] This invention relates to the technical field of zinc-nickel batteries, and more specifically to an electrolyte for improving the float charging performance of zinc-nickel batteries, its preparation method, and its application. Background Technology

[0002] Nickel-zinc batteries are considered an ideal alternative to traditional lead-acid and nickel-cadmium batteries due to their advantages such as high operating voltage, high energy density, excellent power characteristics, relatively low cost, and environmental friendliness. They show great application potential, especially in uninterruptible power supplies (UPS), backup power for communication base stations, and emergency energy storage. A common characteristic of these applications is that the batteries are in a float charge state for extended periods, meaning they are continuously connected to a charging power source to maintain a full charge, thus ensuring instantaneous power delivery when the main power supply is interrupted.

[0003] However, nickel-zinc batteries face severe technical challenges in commercial applications, especially in situations requiring long-term float charging. Their performance bottleneck primarily stems from the instability of the zinc anode in alkaline electrolytes. Under float charging conditions, continuous charging voltage exacerbates corrosion and hydrogen evolution side reactions in the zinc electrode. This not only consumes active materials and water in the electrolyte but also leads to increased internal battery pressure, causing safety hazards such as casing bulging. Simultaneously, the inherent dendrite growth and electrode deformation issues of the zinc electrode during cycling accumulate under long-term, low-current float charging, easily puncturing the separator and causing internal short circuits, leading to sudden battery failure.

[0004] Furthermore, the electrolyte itself also suffers from stability issues. For example, it absorbs carbon dioxide from the air, leading to carbonation, which reduces the electrolyte's ionic conductivity and affects electrode performance. While existing technologies attempt to suppress specific problems by adding single or dual-component additives to the electrolyte, such as individually inhibiting dendrite formation or reducing corrosion rates, they often struggle to address the complex situation of multiple degradation mechanisms coexisting under float charging conditions. These degradation factors intertwine and reinforce each other, resulting in generally poor float charging performance of existing nickel-zinc batteries, characterized by large voltage fluctuations, rapid capacity decay, and actual lifespan far below theoretical expectations, thus limiting their widespread application in critical backup power applications. Therefore, developing a comprehensive technical solution that can synergistically address the aforementioned technical problems and significantly improve the float charging performance of nickel-zinc batteries has become an urgent technical challenge in this field. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an electrolyte that improves the float charging performance of zinc-nickel batteries, as well as its preparation method and application.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] In a first aspect, the present invention provides an electrolyte for improving the float charging performance of zinc-nickel batteries, comprising the following raw materials by weight percentage: 25-50% alkali agent, 5-15% ZnO, 0.5-5% lithium salt, 0.1-5% boric acid and / or borates, 0.005-0.03% silicates, 0.01-0.5% surfactants and 0.01-0.5% additives, with the balance being pure water; wherein the additives are ammonium o-sulfobenzoate, 3-amino-1,2,4-triazole and N-benzyloxycarbonyl-L-threonine.

[0008] The sulfonic acid group (-SO3-) in ammonium o-sulfobenzoate has a strong adsorption capacity, which can form a solid electrolyte interphase (SEI) layer on the zinc surface. This layer physically isolates water molecules from direct contact with zinc, thereby inhibiting hydrogen evolution corrosion at its source. Simultaneously, it promotes uniform Zn deposition. 2+ Flux, which prevents the rapid accumulation of zinc ions in local areas, provides a flat substrate for zinc deposition that can withstand continuous voltage and prevent protection failure.

[0009] 3-Amino-1,2,4-triazole is a water-soluble heterocyclic amine compound. The amino and triazole rings in this additive molecule can complex with zinc ions to form a stable complex. This complex can regulate the migration rate of zinc ions and prevent excessive accumulation of zinc ions in local areas, thus resulting in more uniform zinc ion deposition on the electrode surface. After the complex is adsorbed on the zinc surface, it can also reduce the non-uniformity of the surface electric field and prevent dendrite growth caused by excessively strong local electric fields. When 3-amino-1,2,4-triazole is adsorbed onto the zinc electrode surface, it will cover some of the active sites that allow the hydrogen evolution reaction to occur, thereby inhibiting the hydrogen evolution reaction, reducing the generation of by-products, and improving coulombic efficiency.

[0010] N-Benzyloxycarbonyl-L-threonine can reduce the grain size of zinc deposits, resulting in a denser and smoother deposition layer, further reducing the possibility of dendrite growth. This additive guides zinc to preferentially grow horizontally, fundamentally avoiding the formation of vertical dendrites, ensuring that the deposition layer remains dense even under long-term microcurrents, greatly improving the stability of the electrode structure. Furthermore, because N-benzyloxycarbonyl-L-threonine is more easily adsorbed on the zinc metal anode surface, it can form a protective film on the zinc surface, reducing the contact between water molecules and zinc, thereby reducing hydrogen evolution corrosion and the formation of byproducts, thus improving coulombic efficiency.

[0011] The three additives in this invention, when combined, ensure that zinc deposition maintains a uniform interfacial film, preventing dendrite penetration. Furthermore, the formation of this interfacial film and the reduction in water molecule contact significantly decrease hydrogen evolution during float charging, reducing internal battery pressure rise, preventing casing bulging, and thus improving float charge cycle life. Moreover, the interfacial film also inhibits side reactions and zinc corrosion, allowing the battery to maintain a high capacity even under long-term float charging.

[0012] Preferably, the mass ratio of ammonium o-sulfobenzoate, 3-amino-1,2,4-triazole and N-benzyloxycarbonyl-L-threonine is (5-8):(2-3):1.

[0013] Preferably, the surfactant is a mixture of dodecyl dimethyl benzyl ammonium chloride and sorbitol in a mass ratio of (3-5):1.

[0014] Preferably, the alkaline agent is potassium hydroxide and / or sodium hydroxide.

[0015] Preferably, the lithium salt is lithium carbonate.

[0016] Preferably, the borate is at least one selected from sodium metaborate, potassium tetraborate, lithium borate, and ammonium borate.

[0017] Preferably, the silicate is at least one of potassium silicate, sodium silicate, sodium metasilicate, and potassium metasilicate.

[0018] Secondly, the present invention provides a method for preparing an electrolyte that improves the float charging performance of zinc-nickel batteries, comprising the following steps:

[0019] S1. Add the alkali to pure water and stir until completely dissolved to obtain an alkaline solution. Under stirring conditions, slowly add ZnO to the alkaline solution and continue stirring until completely dissolved to obtain an alkaline zincate solution.

[0020] S2. Add lithium salt, boric acid and / or borate to the alkaline zincate solution obtained in step S1, and stir until completely dissolved to obtain the first mixture;

[0021] S3. Disperse silicate in pure water to form a pre-dispersion, add the pre-dispersion to the first mixture obtained in step S2, and sonicate until uniformly dispersed to obtain a second mixture;

[0022] S4. Add surfactant and additive to the second mixture obtained in step S3, and stir until completely dissolved to obtain the electrolyte that improves the float charging performance of zinc-nickel batteries.

[0023] Thirdly, the present invention provides the application of the electrolyte described in the first aspect for improving the float charging performance of zinc-nickel batteries in the preparation of zinc-nickel batteries.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] The additive of this invention effectively inhibits dendrite growth and hydrogen evolution corrosion of the zinc anode through the synergistic effect of three components: ammonium o-sulfobenzoate forms a stable SEI film on the zinc surface, homogenizing the zinc ion flux; 3-amino-1,2,4-triazole complexes with zinc ions and adsorbs on the electrode surface, balancing the electric field distribution and inhibiting dendrite growth and hydrogen evolution; N-benzyloxycarbonyl-L-threonine refines the grains and reduces the interfacial water content, further inhibiting dendrite growth and hydrogen evolution. These three components together construct a multi-layered synergistic interfacial protection system, significantly improving the cycle stability, safety, and lifespan of zinc-nickel batteries under float charging conditions. Detailed Implementation

[0026] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0027] The sources of raw materials used in the following examples and comparative examples are as follows:

[0028] ammonium o-sulfobenzoate: Manufacturer: Hubei Jusheng Technology Co., Ltd., Product No.: JS1009;

[0029] 3-Amino-1,2,4-triazole: Manufacturer: Glentham, Product No.: GK0366;

[0030] N-Benzyloxycarbonyl-L-threonine: Manufacturer: Guangdong Wengjiang Chemical Reagent Co., Ltd., Product No.: PA13601;

[0031] Unless otherwise specified, all other materials, reagents, etc. used in the examples and comparative examples are commercially available.

[0032] Example 1

[0033] An electrolyte for improving the float charging performance of zinc-nickel batteries comprises the following raw materials by weight percentage: 43% alkali, 10% ZnO, 3% lithium salt, 2% borate, 0.01% silicate, 0.3% surfactant, and 0.3% additive, with the balance being pure water; wherein the alkali is sodium hydroxide, the lithium salt is lithium carbonate, the borate is sodium metaborate, the silicate is potassium silicate and sodium metasilicate in a mass ratio of 1:0.4, the surfactant is dodecyl dimethyl benzyl ammonium chloride and sorbitol in a mass ratio of 4:1, and the additive is ammonium o-sulfobenzoate, 3-amino-1,2,4-triazole, and N-benzyloxycarbonyl-L-threonine in a mass ratio of 6:2.4:1;

[0034] The method for preparing the electrolyte for improving the float charging performance of zinc-nickel batteries includes the following steps:

[0035] S1. Add the alkali to 1 / 3 of the total mass of pure water and stir until completely dissolved to obtain an alkaline solution. Under stirring conditions, slowly add ZnO to the alkaline solution and continue stirring until completely dissolved to obtain an alkaline zincate solution.

[0036] S2. Add lithium salt and borate to the alkaline zincate solution obtained in step S1, and stir until completely dissolved to obtain the first mixture;

[0037] S3. Disperse silicate in the remaining pure water to form a pre-dispersion, add the pre-dispersion to the first mixture obtained in step S2, and sonicate until uniformly dispersed to obtain the second mixture.

[0038] S4. Add surfactant and additive to the second mixture obtained in step S3, and stir until completely dissolved to obtain the electrolyte that improves the float charging performance of zinc-nickel batteries.

[0039] Example 2

[0040] An electrolyte for improving the float charging performance of zinc-nickel batteries comprises the following raw materials by weight percentage: 25% alkali, 5% ZnO, 0.5% lithium salt, 0.1% boric acid, 0.005% silicate, 0.01% surfactant, and 0.01% additive, with the balance being pure water; wherein the alkali is sodium hydroxide, the lithium salt is lithium carbonate, the silicate is sodium silicate, the surfactant is dodecyl dimethyl benzyl ammonium chloride and sorbitol in a mass ratio of 3:1, and the additive is ammonium o-sulfobenzoate, 3-amino-1,2,4-triazole, and N-benzyloxycarbonyl-L-threonine in a mass ratio of 5:2:1;

[0041] The method for preparing the electrolyte for improving the float charging performance of zinc-nickel batteries includes the following steps:

[0042] S1. Add the alkaline agent to 1 / 3 of the total mass of pure water and stir until completely dissolved to form an alkaline solution. Under stirring conditions, gradually add ZnO to the alkaline solution and continue stirring until completely dissolved to obtain an alkaline zincate solution.

[0043] S2. Add lithium salt and boric acid to the alkaline zincate solution obtained in step S1, and stir until completely dissolved to obtain the first mixture;

[0044] S3. Disperse the silicate in the remaining pure water to form a pre-dispersion, then add it to the first mixture obtained in step S2, and sonicate it to disperse it evenly to obtain the second mixture.

[0045] S4. Add surfactant and additive to the second mixture obtained in step S3, and stir until completely dissolved to obtain the electrolyte that improves the float charging performance of zinc-nickel batteries.

[0046] Example 3

[0047] An electrolyte for improving the float charging performance of zinc-nickel batteries comprises the following raw materials by weight percentage: 50% alkali, 15% ZnO, 5% lithium salt, 5% borate, 0.03% silicate, 0.5% surfactant, and 0.5% additive, with the balance being pure water; wherein the alkali is potassium hydroxide, the lithium salt is lithium carbonate, the borate is sodium metaborate and ammonium borate in a mass ratio of 1:1, the silicate is sodium silicate and potassium metasilicate in a mass ratio of 2:1, the surfactant is dodecyl dimethyl benzyl ammonium chloride and sorbitol in a mass ratio of 5:1, and the additive is ammonium o-sulfobenzoate, 3-amino-1,2,4-triazole, and N-benzyloxycarbonyl-L-threonine in a mass ratio of 8:3:1;

[0048] The method for preparing the electrolyte for improving the float charging performance of zinc-nickel batteries includes the following steps:

[0049] S1. Add the alkaline agent to 1 / 3 of the total mass of pure water and stir until completely dissolved to form an alkaline solution. Under stirring conditions, gradually add ZnO to the alkaline solution and continue stirring until completely dissolved to obtain an alkaline zincate solution.

[0050] S2. Add lithium salt and borate to the alkaline zincate solution obtained in step S1, and stir until completely dissolved to obtain the first mixture;

[0051] S3. Disperse the silicate in the remaining pure water to form a pre-dispersion, then add it to the first mixture obtained in step S2, and sonicate it to disperse it evenly to obtain a second mixture.

[0052] S4. Add surfactant and additive to the second mixture obtained in step S3, and stir until completely dissolved to obtain the electrolyte that improves the float charging performance of zinc-nickel batteries.

[0053] Example 4

[0054] The only difference between Example 4 and Example 1 is that the amount of surfactant added remains the same, dodecyl dimethyl benzyl ammonium chloride is not added, and sorbitol is used to make up for the missing amount.

[0055] Example 5

[0056] The only difference between Example 5 and Example 1 is that the amount of surfactant added remains the same, sorbitol is not added, and dodecyl dimethyl benzyl ammonium chloride is used to make up the missing amount.

[0057] Example 6

[0058] The only difference between Example 6 and Example 1 is that the amount of the additive remains the same, and the mass ratio of ammonium o-sulfobenzoate, 3-amino-1,2,4-triazole and N-benzyloxycarbonyl-L-threonine is 2.4:6:1.

[0059] Example 7

[0060] The only difference between Example 7 and Example 1 is that the amount of the additive remains the same, and the mass ratio of ammonium o-sulfobenzoate, 3-amino-1,2,4-triazole and N-benzyloxycarbonyl-L-threonine is 6:1:2.4.

[0061] Comparative Example 1

[0062] The only difference between Comparative Example 1 and Example 1 is that no additives are added to the electrolyte, and pure water is used to make up the missing amount.

[0063] Comparative Example 2

[0064] The only difference between Comparative Example 2 and Example 1 is that the amount of additives added remains the same, ammonium o-sulfobenzoate is not added, and 3-amino-1,2,4-triazole and N-benzyloxycarbonyl-L-threonine in a mass ratio of 2.4:1 are used to make up the missing amount.

[0065] Comparative Example 3

[0066] The only difference between Comparative Example 3 and Example 1 is that the amount of additives added remains the same, 3-amino-1,2,4-triazole is not added, and ammonium o-sulfobenzoate and N-benzyloxycarbonyl-L-threonine in a mass ratio of 6:1 are used to make up the missing amount.

[0067] Comparative Example 4

[0068] The only difference between Comparative Example 4 and Example 1 is that the amount of additives added remains the same, N-benzyloxycarbonyl-L-threonine is not added, and ammonium o-sulfobenzoate and 3-amino-1,2,4-triazole in a mass ratio of 6:2.4 are used to make up the missing amount.

[0069] Application Example 1-7 and Comparative Application Example 1-4

[0070] The zinc-nickel batteries used in Application Examples 1-7 and Comparative Application Examples 1-4 include a positive electrode, a negative electrode, a separator, and an electrolyte. The assembly method is as follows: the positive electrode, separator, and negative electrode are stacked sequentially, with the separator positioned between the positive and negative electrodes for isolation. Then, the bare cell is wound up. The bare cell is placed in a steel casing, and the exposed edge of the negative electrode is welded to the negative current collector. The negative current collector is then welded to the steel casing. Electrolyte injection, cap welding, and sealing are then performed to produce the zinc-nickel battery.

[0071] The electrolytes were prepared in Examples 1-7 and Comparative Examples 1-4.

[0072] Preparation method of negative electrode: Active material (ZnO), conductive agent (acetylene black), and binder (PVDF) are weighed and ground uniformly at a mass ratio of 8:1:1 to obtain a mixture. N-methyl-2-pyrrolidone (NMP) is titrated (material-to-liquid ratio of 1 g:20 mL), and the mixture is stirred for 10 h to form a uniform slurry. The slurry is then coated onto a current collector carbon cloth with a diameter of 1.3 cm and dried at 80 °C for 12 h. The loading of each electrode is 2 mg·cm⁻¹. -2 about;

[0073] Preparation method of positive electrode: Commercial Ni(OH)2 powder and acetylene black are mixed at a mass ratio of 8:1. Finally, 10 wt% PTFE emulsion is added dropwise, followed by ultrasonic mixing with an equal mass of alcohol. The mixture is then dried in a forced-air drying oven at 80℃. The dried mixture is then moistened with alcohol at a material-to-liquid ratio of 1g:2mL to form a clay-like consistency, resulting in a positive electrode slurry. This slurry is then uniformly pressed onto a substrate with a surface density of 400g / m³. 2 On the nickel foam current collector, the amount of positive electrode slurry in each nickel foam current collector is the same (the deviation does not exceed 0.5%). After the electrode is vacuum dried at 120°C for 8 hours, it is pressed at 10 MPa under a hydraulic press and then cut to obtain the positive electrode.

[0074] Performance testing

[0075] The zinc-nickel batteries corresponding to use cases 1-6 and comparative application examples 1-4 were subjected to three cycles of 0.2C charge-discharge, and the highest electrochemical capacity was recorded as the standard capacity.

[0076] Storage performance testing involved placing fully charged batteries at 60℃ for 10, 20, and 30 days respectively. High-temperature storage at 60℃ simulates 4 years of storage at room temperature. After storage, the batteries were removed and left at room temperature for 2 hours before discharge. The discharge capacity SOC was calculated as (discharge capacity / standard capacity) × 100%. Three 0.2C charge-discharge cycles were then performed, and the final discharge capacity SOH was recorded as (discharge capacity / standard capacity) × 100%. The test results are shown in Table 1.

[0077] Table 1. Discharge capacity results of zinc-nickel batteries in each group

[0078]

[0079] A higher SOC% under float charging conditions indicates a lower self-discharge rate for the zinc-nickel battery. The battery retains a high charge level even after 10, 20, and 30 days of rest, demonstrating stronger capacity retention, self-discharge resistance, hydrogen evolution resistance, corrosion resistance, and dendrite resistance under prolonged charging conditions. A higher SOH% indicates slower capacity decay and almost no irreversible capacity loss during storage, suggesting a stable electrode structure, minimal active material shedding, and minimal dendrite formation.

[0080] Combining the data from Application Example 1 and Application Examples 4-5 in Table 1, it can be seen that the SOC% and SOH% of Application Example 4-5 are lower than those of Application Example 1. This may be because the dodecyl dimethyl benzyl ammonium chloride and sorbitol in the surfactant system can synergistically increase the viscosity of the electrolyte, improve wettability, stabilize zincate and help suppress dendrites. The absence of either one will destroy this synergistic effect.

[0081] Combining the data from Application Examples 1 and 6-7 in Table 1, it can be seen that the SOC% and SOH% of Application Examples 4-5 are lower than those of Application Example 1. This indicates that when the mass ratio of ammonium o-sulfobenzoate, 3-amino-1,2,4-triazole, and N-benzyloxycarbonyl-L-threonine is not within the preferred range of (5-8):(2-3):1, it may lead to instability of the zinc anode interface film, unbalanced zinc ion migration, intensified dendrite growth, and increased hydrogen evolution corrosion, thereby significantly reducing the SOC% and SOH% of the battery under float charging conditions. Therefore, only when the three additives are within the preferred ratio range can the optimal float charging performance improvement effect be achieved.

[0082] Combining the data from Application Example 1 and Comparative Application Examples 1-4 in Table 1, it can be seen that the SOC% and SOH% of Comparative Application Examples 1-4 are significantly lower than those of Application Example 1, with Comparative Application Example 1 showing the worst performance. This indicates that the addition of additives is a key factor in improving the float charging performance of zinc-nickel batteries. Furthermore, the electrolytes in Comparative Application Examples 2-4 lack one of the following: ammonium o-sulfobenzoate, 3-amino-1,2,4-triazole, or N-benzyloxycarbonyl-L-threonine. This results in instability at the zinc anode interface, increased dendrite growth, and increased hydrogen evolution corrosion. This suggests that ammonium o-sulfobenzoate, 3-amino-1,2,4-triazole, and N-benzyloxycarbonyl-L-threonine can synergistically improve the float charging performance of zinc-nickel batteries.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An electrolyte for improving the float charging performance of zinc-nickel batteries, characterized in that, The raw materials comprise the following by weight percentage: 25-50% alkali, 5-15% ZnO, 0.5-5% lithium salt, 0.1-5% boric acid and / or borates, 0.005-0.03% silicates, 0.01-0.5% surfactants and 0.01-0.5% additives, with the balance being pure water; wherein the additives are ammonium o-sulfobenzoate, 3-amino-1,2,4-triazole and N-benzyloxycarbonyl-L-threonine.

2. The electrolyte for improving the float charging performance of zinc-nickel batteries as described in claim 1, characterized in that, The mass ratio of ammonium o-sulfobenzoate, 3-amino-1,2,4-triazole and N-benzyloxycarbonyl-L-threonine is (5-8):(2-3):

1.

3. The electrolyte for improving the float charging performance of zinc-nickel batteries as described in claim 1, characterized in that, The surfactant is a mixture of dodecyl dimethyl benzyl ammonium chloride and sorbitol in a mass ratio of (3-5):

1.

4. The electrolyte for improving the float charging performance of zinc-nickel batteries as described in claim 1, characterized in that, The alkaline agent is potassium hydroxide and / or sodium hydroxide.

5. The electrolyte for improving the float charging performance of zinc-nickel batteries as described in claim 1, characterized in that, The lithium salt is lithium carbonate.

6. The electrolyte for improving the float charging performance of zinc-nickel batteries as described in claim 1, characterized in that, The borate is at least one selected from sodium metaborate, potassium tetraborate, lithium borate, and ammonium borate.

7. The electrolyte for improving the float charging performance of zinc-nickel batteries as described in claim 1, characterized in that, The silicate is at least one of potassium silicate, sodium silicate, sodium metasilicate, and potassium metasilicate.

8. The method for preparing the electrolyte for improving the float charging performance of zinc-nickel batteries according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Add the alkali to pure water and stir until completely dissolved to obtain an alkaline solution. Under stirring conditions, slowly add ZnO to the alkaline solution and continue stirring until completely dissolved to obtain an alkaline zincate solution. S2. Add lithium salt, boric acid and / or borate to the alkaline zincate solution obtained in step S1, and stir until completely dissolved to obtain the first mixture; S3. Disperse silicate in pure water to form a pre-dispersion, add the pre-dispersion to the first mixture obtained in step S2, and sonicate until uniformly dispersed to obtain a second mixture; S4. Add surfactant and additive to the second mixture obtained in step S3, and stir until completely dissolved to obtain the electrolyte that improves the float charging performance of zinc-nickel batteries.

9. The application of the electrolyte for improving the float charge performance of zinc-nickel batteries according to any one of claims 1-7 in the preparation of zinc-nickel batteries.

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