Organic zinc ion battery electrolyte and organic zinc ion battery

Abstract

The invention provides an organic zinc ion battery electrolyte and an organic zinc ion battery, the organic zinc ion battery electrolyte comprises water, and a zinc salt, a potassium salt and an iodized salt dissolved in the water, and the molar ratio of the iodized salt to the total amount of the zinc salt and the potassium salt is 1: (6-70). The organic zinc ion battery comprises a positive electrode, an electrolyte and a negative electrode, the positive electrode comprises dimethyl phenazine, and the electrolyte is the organic zinc ion battery electrolyte. The electrolyte based on the invention can effectively inhibit the dissolution of the dimethyl phenazine positive electrode in the charge-discharge process, and improves the long-term stable cycle performance of the zinc ion battery.

Description

Technical Field

[0001] The invention belongs to the technical field of zinc ion batteries and relates to an organic zinc ion battery electrolyte and an organic zinc ion battery. Background Art

[0002] In recent years, the rapid development of electric vehicles and renewable energy has greatly promoted the large-scale production and application of zinc-ion batteries (ZIBs). However, the cathode of traditional ZIBs faces problems such as high cost, limited raw material resources and safety. Therefore, the development of new electrode materials has become one of the important research directions in the field of energy storage. Redox-active organic materials (ROMs) are considered to be one of the most promising alternative materials due to their high cost-effectiveness, abundant resources and environmental friendliness. Compared with traditional transition metal-based inorganic materials, ROMs are composed of lightweight and naturally abundant elements (such as C, N, S and O), and have significant advantages in achieving high specific capacity and low cost. Among the many ROMs reported, multi-electron redox molecules have attracted much attention because they can provide higher specific capacity and become a strong candidate for high energy density organic electrode materials. Among them, dimethylphenazine (DMPZ) is a typical representative. The nitrobutadiene (NCCN) redox center in the DMPZ molecule can undergo a two-electron redox reaction, showing p-type characteristics, and its theoretical capacity is as high as 255 mAh g -1 The average redox potential is 1.3 V (relative to Zn / Zn 2+ ). Therefore, DMPZ electrodes exhibit excellent energy density and are expected to surpass traditional transition metal-based electrode materials.

[0003] However, DMPZ easily generates soluble quaternary ammonium salts during the charge and discharge process, which leads to serious loss of active substances and capacity decay, resulting in irreversible loss of electrode materials and a significant decrease in cycle life, which seriously restricts its practical application. This problem is also a universal challenge that most known organic electrode materials have long faced. In the past few decades, researchers have conducted a lot of exploration to solve these problems, including strategies such as encapsulating redox-active organic materials (ROMs) in host materials and adopting functional membranes. Although these methods have achieved certain results, they have not fundamentally solved the problem. In addition, research on inhibiting dissolution through structural adjustments at the material level (such as dimerization or polymerization) has also made some progress. However, the cycle performance of organic electrodes is still far from the requirements of practical applications. Therefore, developing more effective strategies to solve the dissolution problem of organic electrode materials and improve their cycle stability remains an important direction of current research. Summary of the invention

[0004] In order to solve the above problems of the prior art, the present invention provides an organic zinc ion battery electrolyte and an organic zinc ion battery, which can effectively inhibit the dissolution of the dimethylphenazine positive electrode during the charging and discharging process and improve the long-term stable cycle performance of the zinc ion battery.

[0005] The present invention is achieved through the following technical solutions: In a first aspect, the present invention provides an organic zinc ion battery electrolyte, comprising: water and zinc salt, potassium salt and iodine salt dissolved in the water, wherein the molar ratio of iodine salt to the total amount of zinc salt and potassium salt is 1:(6~70).

[0006] Preferably, the zinc salt is one of zinc acetate, zinc perchlorate and zinc sulfate.

[0007] Preferably, the potassium salt is one of potassium acetate, potassium perchlorate and potassium chloride.

[0008] Preferably, the iodized salt is one of zinc iodide, potassium iodide and sodium iodide. Preferably, the concentration of the iodized salt is 0.1~1 M.

[0009] Preferably, the concentration of the zinc salt is 1-10 M.

[0010] Preferably, the concentration of the potassium salt is 2-20 M.

[0011] In a second aspect, the present invention provides an organic zinc ion battery, comprising a positive electrode, an electrolyte and a negative electrode, wherein the positive electrode component comprises dimethylphenazine, and the electrolyte is the organic zinc ion battery electrolyte as described above.

[0012] Preferably, the positive electrode component further comprises activated carbon, carbon black and polytetrafluoroethylene.

[0013] Preferably, the mass ratio of dimethylphenazine, activated carbon, carbon black and polytetrafluoroethylene is (5-10):(5-10):(0.5-2):(0.5-2).

[0014] Compared with the prior art, the present invention has the following beneficial effects: The organic zinc ion battery electrolyte of the present invention uses zinc salt and potassium salt as electrolytes and iodine salt as additives. When applied to an organic zinc ion battery using DMPZ as a positive electrode material, because DMPZ is a Lewis soft acid and iodine salt is a Lewis soft base, during the charge and discharge process, iodine ions can form a stable coordination structure with DMPZ molecules and deposit on the positive electrode of the battery, thereby significantly inhibiting the dissolution behavior of the DMPZ positive electrode material and ensuring the long-term stable cycle performance of the battery. The amount of iodine salt used cannot be too high, otherwise it is easy to cause multi-iodide shuttle, and it cannot be too low, otherwise it will not play a catalytic mediation role. The amount of iodine salt limited by the present invention can significantly inhibit the dissolution behavior of the DMPZ positive electrode material and will not cause multi-iodide shuttle. Compared with expedients such as physical encapsulation or the use of functional diaphragms, the present invention can fundamentally inhibit the dissolution of the DMPZ positive electrode during the charge and discharge process and improve the long-term stable cycle performance of the organic zinc ion battery. At the same time, the capacity and rate performance of the organic zinc ion battery are also provided.

[0015] Furthermore, the concentration of potassium salt and zinc salt should not be too high, which will increase the viscosity of the electrolyte and reduce the Zn 2+ The concentration of potassium salt and zinc salt should not be too low, which will reduce the ionic conductivity, resulting in a decrease in the conductivity of the electrolyte and an increase in the internal resistance of the battery. The concentration of potassium salt and zinc salt defined in the present invention can ensure that the electrolyte has good conductivity and Zn 2+ Migration rate.

[0016] The organic zinc ion battery based on the organic zinc ion battery electrolyte of the present invention can form a stable coordination structure with DMPZ and deposit on the positive electrode of the battery during the charge and discharge process, thereby significantly inhibiting the dissolution behavior of the DMPZ positive electrode material, so that the organic zinc ion battery has good long-term stable cycle performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a diagram of the mechanism of action of dimethylphenazine with iodine; Figure 2 The charge and discharge curves of the DMPZ-I zinc ion battery of Examples 12 to 15; Figure 3 It is the long cycle curve of the DMPZ-I zinc ion battery of Examples 12, 16 to 18; Figure 4 The self-discharge curves of the DMPZ zinc ion battery (a) of Comparative Example 1 and the DMPZ-I zinc ion battery (b) of Example 12; Figure 5 The charge and discharge curves (a) and rate performance (b) of the DMPZ zinc ion battery of Comparative Example 1 and the DMPZ-I zinc ion battery of Example 12; Figure 6 Long cycle curves of the DMPZ zinc ion battery of Comparative Example 1 and the DMPZ-I zinc ion battery of Example 12; (a) Current density 0.1A g -1 , (b) current density 1A g -1 . DETAILED DESCRIPTION

[0019] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0020] It should be noted that the process equipment or devices not specifically specified in the following embodiments are all conventional equipment or devices in the art.

[0021] It should be noted that the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or to define the scope of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the present invention without substantially changing the technical content.

[0022] The present invention finds that Lewis soft acid and Lewis soft base can form a stable coordination complex. In order to effectively inhibit the dissolution of DMPZ, the present invention proposes a strategy of introducing Lewis soft base (iodide ion) into the electrolyte, such as Figure 1 As shown in the figure, during the charge and discharge process, iodine ions can form a stable coordination structure with DMPZ molecules, thereby significantly inhibiting the dissolution behavior of DMPZ positive electrode materials and ensuring the long-term stable cycle performance of zinc ion batteries. This strategy provides a new idea and method for solving the dissolution problem of organic electrode materials.

[0023] Specifically, the organic zinc ion battery electrolyte of the present invention comprises water and zinc salt, potassium salt and iodine salt dissolved in the water, wherein the molar ratio of iodine salt to the total amount of zinc salt and potassium salt is 1:(6~70), more preferably 1:(6~30).

[0024] The iodine salt is used as an electrolyte additive to provide iodine ions, which are coupled to the redox reaction coordination of Lewis soft acid (dimethylphenazine) and Lewis soft base (polyiodide ions) during the charge and discharge process, in order to inhibit the dissolution of the dimethylphenazine positive electrode.

[0025] Specifically, the iodized salt in the present invention can be zinc iodide, potassium iodide or sodium iodide. The zinc salt is one of zinc acetate, zinc perchlorate and zinc sulfate. The potassium salt is one of potassium acetate, potassium perchlorate and potassium chloride.

[0026] In the organic zinc ion battery electrolyte of the present invention, zinc salt and potassium salt are used as electrolytes to provide zinc ions and potassium ions.

[0027] In the organic zinc ion battery electrolyte of the present invention, the concentration of iodine salt is preferably 0.1~1 M, more preferably 0.5~0.8 M; the concentration of zinc salt is preferably 1~10 M, more preferably 1~5 M; the concentration of potassium salt is 2~20 M, more preferably 2~10 M.

[0028] Based on the organic zinc ion battery electrolyte, the present invention assembles an organic zinc ion battery, which includes a positive electrode, an electrolyte and a negative electrode, the active component of the positive electrode is dimethylphenazine, and the electrolyte is the organic zinc ion battery electrolyte of the present invention.

[0029] In the organic zinc ion battery of the present invention, when a cycle reaction is carried out, iodine ions in the electrolyte of the organic zinc ion battery can form a coordination structure with dimethylphenazine, thereby avoiding the dissolution of dimethylphenazine and improving the cycle stability of the organic zinc ion battery.

[0030] In some embodiments of the present invention, the components of the positive electrode further include activated carbon, carbon black and polytetrafluoroethylene, and the mass ratio of dimethylphenazine, activated carbon, carbon black and polytetrafluoroethylene is (5~10):(5~10):(1~3):(0.5~2).

[0031] Among them, activated carbon as a carrier provides high specific surface area and pore structure to promote the uniform distribution of dimethylphenazine. Carbon black as a conductive additive improves the conductivity and electrochemical performance of the electrode. Polytetrafluoroethylene as a binder enhances the mechanical strength and stability of the electrode.

[0032] In some embodiments of the present invention, the negative electrode is a zinc negative electrode.

[0033] Example 1 This embodiment provides an organic zinc ion battery electrolyte, including zinc iodide, zinc acetate, potassium acetate and water; the concentration of the zinc iodide is 0.1 M, the concentration of the zinc acetate is 1 M; the concentration of the potassium acetate is 2 M.

[0034] Example 2 This embodiment provides an organic zinc ion battery electrolyte, including zinc iodide, zinc acetate, potassium acetate and water; the concentration of the zinc iodide is 0.5 M, the concentration of the zinc acetate is 2 M; the concentration of the potassium acetate is 5 M.

[0035] Example 3 This embodiment provides an organic zinc ion battery electrolyte, including zinc iodide, zinc acetate, potassium acetate and water; the concentration of the zinc iodide is 0.5 M, the concentration of the zinc acetate is 1 M; the concentration of the potassium acetate is 2 M.

[0036] Example 4 This embodiment provides an organic zinc ion battery electrolyte, including zinc iodide, zinc acetate, potassium acetate and water; the concentration of the zinc iodide is 0.5 M, the concentration of the zinc acetate is 5 M; the concentration of the potassium acetate is 10 M.

[0037] Example 5 This embodiment provides an organic zinc ion battery electrolyte, including zinc iodide, zinc acetate, potassium acetate and water; the concentration of the zinc iodide is 0.5 M, the concentration of the zinc acetate is 10 M; and the concentration of the potassium acetate is 20 M.

[0038] Example 6 This embodiment provides an organic zinc ion battery electrolyte, including zinc iodide, zinc acetate, potassium acetate and water; the concentration of the zinc iodide is 0.1 M, the concentration of the zinc acetate is 2 M; the concentration of the potassium acetate is 5 M.

[0039] Example 7 This embodiment provides an organic zinc ion battery electrolyte, including zinc iodide, zinc acetate, potassium acetate and water; the concentration of the zinc iodide is 0.3 M, the concentration of the zinc acetate is 2 M; the concentration of the potassium acetate is 5 M.

[0040] Example 8 This embodiment provides an organic zinc ion battery electrolyte, including zinc iodide, zinc acetate, potassium acetate and water; the concentration of the zinc iodide is 0.8 M, the concentration of the zinc acetate is 2 M; the concentration of the potassium acetate is 5 M.

[0041] Example 9 This embodiment provides an organic zinc ion battery electrolyte, including zinc iodide, zinc acetate, potassium acetate and water; the concentration of the zinc iodide is 1 M, the concentration of the zinc acetate is 10 M; the concentration of the potassium acetate is 20 M.

[0042] Example 10 This embodiment provides an organic zinc ion battery electrolyte, including sodium iodide, zinc acetate, potassium acetate and water; the concentration of the sodium iodide is 0.1 M, the concentration of the zinc acetate is 1 M; the concentration of the potassium acetate is 2 M.

[0043] Embodiment 11 An embodiment of the present invention provides an organic zinc ion battery electrolyte, comprising potassium iodide, zinc acetate and potassium acetate; the concentration of the potassium iodide is 0.1 M, the concentration of the zinc acetate is 1 M; and the concentration of the potassium acetate is 2 M.

[0044] Example 12 This embodiment provides an organic zinc ion battery, including a positive electrode, a zinc sheet negative electrode, a separator and the electrolyte described in Example 2.

[0045] Dimethylphenazine, activated carbon (AC), Ketjen black (KB) and polytetrafluoroethylene (PTFE) were mixed in a weight ratio of 8:8:1:1, and an appropriate amount of isopropyl alcohol (IPA) was added as a solvent, and the mixture was fully stirred until it formed a uniform wet dough. Subsequently, the wet dough was pressed into an electrode film with uniform thickness and good mechanical strength, and rolled on a titanium mesh (60 mesh). Finally, the electrode was placed at room temperature and dried for 24 hours to obtain the final DMPZ positive electrode.

[0046] The zinc sheet negative electrode needs to be polished with 2000-grit sandpaper before use. After polishing for 20 minutes, it is polished with 0.3mm and 0.05mm alumina polishing powder and anhydrous ethanol respectively. It is then ultrasonically cleaned in a mixed solution of acetone, deionized water and isopropanol (acetone, deionized water and isopropanol volume ratio 1:1:1), dried at room temperature and punched into discs with a diameter of 12 mm.

[0047] The zinc-ion battery was assembled and tested using a CR2032 button cell case. The DMPZ battery was assembled in the following order: positive electrode case - 19 mm titanium sheet - positive electrode - diaphragm / electrolyte - zinc negative electrode - 16 mm titanium sheet - gasket - shrapnel - negative electrode case, and then the battery was sealed using a tablet press. During the assembly process, avoid contact between the tweezers and the positive and negative electrodes to cause a short circuit. The electrolyte used was 2 M Zn(CH 3 COO 2 +5 M KCH 3 COO+0.5 M ZnI 2The electrolyte dosage is 30 μL. The glass fiber diaphragm model is Whatman GF / A, and the polyolefin diaphragm model is Celgard 3501.

[0048] The battery assembled in this embodiment is called DMPZ-I zinc ion battery.

[0049] Embodiments 13 to 15 It is basically the same as Example 12, except that Examples 13 to 15 respectively use the electrolytes of Examples 3 to 5.

[0050] Embodiments 16 to 18 It is basically the same as Example 12, except that Examples 16 to 18 use the electrolytes of Examples 6 to 8 respectively.

[0051] Embodiment 19-20 It is basically the same as Example 12, except that Examples 19 to 20 respectively use the electrolytes of Examples 10 to 11.

[0052] Comparative Example 1 It is basically the same as Example 12, except that no iodized salt is added to the electrolyte.

[0053] (1) Preparation of DMPZ positive electrode: Dimethylphenazine, activated carbon, Ketjen black and polytetrafluoroethylene were mixed in a weight ratio of 8:8:1:1, and an appropriate amount of isopropanol was added as a solvent, and the mixture was fully stirred until it formed a uniform wet dough. Subsequently, the wet dough was pressed into an electrode film with uniform thickness and good mechanical strength, and rolled on a titanium mesh (60 mesh). Finally, the electrode was placed at room temperature and dried for 24 hours to obtain the final DMPZ positive electrode.

[0054] (2) Preparation of electrolyte 3.67 g Zn(CH 3 COO 2 , 4.91 g KCH 3 COO was dissolved in 10 mL of deionized water to prepare 2 MZn(CH 3 COO 2 and 5 M KCH 3 Blank electrolyte (ZKC) composed of COO.

[0055] (3) Preparation of zinc negative electrode: The zinc sheet negative electrode needs to be polished with 2000-grit sandpaper before use. After polishing for 20 minutes, it is polished with 0.3mm and 0.05mm alumina polishing powder and anhydrous ethanol respectively. It is then ultrasonically cleaned in a mixed solution of acetone, deionized water and isopropanol (volume ratio 1:1:1), dried at room temperature, and punched into discs with a diameter of 12 mm.

[0056] (4) Assembly of zinc ion batteries The zinc-ion battery was assembled and tested using a CR2032 button cell case. The DMPZ battery was assembled in the following order: positive electrode case - 19 mm titanium sheet - positive electrode - diaphragm / electrolyte - zinc negative electrode - 16 mm titanium sheet - gasket - shrapnel - negative electrode case, and then the battery was sealed using a tablet press. During the assembly process, avoid contact between the tweezers and the positive and negative electrodes to cause a short circuit. The electrolyte used was 2 M Zn(CH 3 COO 2 +5 M KCH 3 COO, the electrolyte dosage is 30 μL. The glass fiber diaphragm model is Whatman GF / A, and the polyolefin diaphragm model is Celgard 3501.

[0057] The battery assembled using the blank electrolyte in Comparative Example 1 is called a DMPZ zinc ion battery.

[0058] Electrochemical performance test: The DMPZ-I zinc ion batteries of Examples 12 to 18 and the DMPZ zinc ion battery of Comparative Example 1 were subjected to self-discharge test, constant current charge and discharge test, rate test and long cycle test at 0.5 to 1.4 V. The results are shown in FIG. Figures 2~6 shown.

[0059] from Figure 2 It can be seen that different concentrations of potassium acetate and zinc acetate have a great influence on the battery capacity. The organic zinc ion battery assembled with 2M zinc acetate + 5M potassium acetate + 0.5M zinc iodide electrolyte has the largest capacity. -1 At a low current density of 2.5 MW, the battery has a specific capacity of up to 205.1 mAh g -1 , which is much higher than the capacity of other electrolytes. This shows that the concentration of potassium acetate and zinc acetate cannot be too high, as it will increase the viscosity of the electrolyte and reduce the Zn 2+ The migration rate will increase the polarization of the battery. The concentration of potassium acetate and zinc acetate cannot be too low, otherwise the ionic conductivity will be reduced, resulting in a decrease in the conductivity of the electrolyte and an increase in the internal resistance of the battery.

[0060] from Figure 3 It can be seen that different zinc iodide concentrations have a great influence on battery performance. -1At a low current density of 2.5 mAhg, the capacity of the organic zinc ion battery assembled with 2M zinc acetate + 5M potassium acetate + 0.5M zinc iodide electrolyte can reach 208.5 mAhg -1 ) is the highest. This shows that the concentration of zinc iodide cannot be too high, otherwise it will cause the shuttling of multiple iodides, resulting in a rapid decrease in battery capacity; the concentration of zinc iodide cannot be too low, otherwise it will not play the role of iodine catalysis and the battery performance will be poor. from Figure 4 It can be seen that the capacity retention rate of the DMPZ zinc ion battery of Comparative Example 1 is 74.2% after being fully charged and standing for 24 hours, and the capacity retention rate of the DMPZ-I zinc ion battery of Example 12 reaches 86.4% after being fully charged and standing for 24 hours, that is, the capacity retention rate of the DMPZ-I zinc ion battery is better. This result shows that the introduction of iodine effectively inhibits the dissolution of the DMPZ positive electrode material, significantly improves the chemical stability of the battery, and reduces the side reaction activity, thereby improving the long-term energy storage performance of the battery.

[0061] from Figure 5 As can be seen in (a), the polarization voltage of the DMPZ-I zinc ion battery of Example 12 is 0.14 V, while that of the DMPZ zinc ion battery of Comparative Example 1 is 0.21 V, that is, the DMPZ-I zinc ion battery exhibits a lower polarization voltage; the specific capacity of the DMPZ-I zinc ion battery is 201.3 mAh g -1 The specific capacity of DMPZ zinc-ion battery is 82.1 mAh g -1 , that is, DMPZ-I zinc-ion battery has a higher specific capacity. Figure 5 It can be seen from (b) that at 0.1 A g -1 At a low current density of 1.5 mAh g, the DMPZ-I zinc ion battery of Example 12 exhibits significantly better electrochemical performance than the DMPZ zinc ion battery of Comparative Example 1, with an initial specific capacity of up to 201.3 mAh g -1 , which is much higher than the capacity of DMPZ zinc-ion battery (82.1 mAh g -1 With the increase of current density, the DMPZ-I zinc-ion battery exhibits excellent capacity retention characteristics at 1.0 A g -1 It can still maintain 131.6 mAh g at a high rate -1 The reversible specific capacity of DMPZ zinc-ion battery (48.4 mAh g -1 ). It is worth noting that after 110 charge and discharge cycles, when the current density returned to 0.1 A g -1 When the DMPZ-I zinc-ion battery is -1The high specific capacity and capacity retention rate are as high as 99.8%, which fully demonstrates the excellent cycle stability and structural stability of the battery system.

[0062] from Figure 6 It can be seen that at 0.1 A g -1 Under the condition of low current density, the DMPZ-I zinc ion battery of Example 12 exhibited excellent electrochemical performance, and its initial discharge specific capacity reached 201.3 mAh g -1 , and showed excellent cycle stability in a 900-hour cycle test, with a capacity retention rate of up to 99.2%. In contrast, the DMPZ zinc-ion battery in Comparative Example 1 showed obvious capacity decay under the same test conditions, and its specific capacity decreased rapidly with the cycle and eventually tended to zero. It is worth noting that at 1.0 A g -1 Under the condition of high current density, the DMPZ-I zinc-ion battery still exhibits good electrochemical performance. After 1000 cycles, its discharge capacity is still maintained at 127.3 mAh g -1 , which fully proves its excellent high-current cycling stability. The above results show that DMPZ-I zinc-ion batteries show significantly better cycling performance than DMPZ zinc-ion batteries under different current density conditions.

[0063] The DMPZ-I zinc ion batteries of Examples 19 to 20 were subjected to charge and discharge tests and long cycle tests at 0.5 to 1.4 V. The charge and discharge test results showed that at 0.1 A g -1 Under the low current density condition, the specific capacity of the DMPZ-I zinc ion battery of Example 19 reached 186.5 mAh g -1 The specific capacity of the DMPZ-I zinc ion battery in Example 20 reaches 176.7 mAh g -1 The long cycle test results show that at 0.1 A g -1 Under the low current density condition, after 200 cycles, the capacity retention rate of the DMPZ-I zinc ion battery in Example 19 is 93.4%, and the capacity retention rate of the DMPZ-I zinc ion battery in Example 20 is 88.5%, which once again shows that the organic zinc ion battery based on the electrolyte of the present invention exhibits good electrochemical performance and high current cycle stability.

[0064] These test results indicate that the addition of iodide ions effectively inhibits the dissolution and diffusion of the dimethylphenazine positive electrode, thereby significantly improving the cycle stability of the battery.

Claims

1. An organic zinc ion battery electrolyte, characterized in that: include: Water and zinc salt, potassium salt and iodine salt dissolved in the water, wherein the molar ratio of iodine salt to the total amount of zinc salt and potassium salt is 1:(6-70).

2. The organic zinc ion battery electrolyte according to claim 1, characterized in that The zinc salt is one of zinc acetate, zinc perchlorate and zinc sulfate.

3. The organic zinc ion battery electrolyte according to claim 1, characterized in that The potassium salt is one of potassium acetate, potassium perchlorate and potassium chloride.

4. The organic zinc ion battery electrolyte according to claim 1, characterized in that The iodized salt is one of zinc iodide, potassium iodide and sodium iodide.

5. The organic zinc ion battery electrolyte according to claim 1, characterized in that The concentration of the iodized salt is 0.1-1 M.

6. The organic zinc ion battery electrolyte according to claim 1, characterized in that The concentration of the zinc salt is 1-10M.

7. The organic zinc ion battery electrolyte according to claim 1, characterized in that The concentration of the potassium salt is 2-20M.

8. An organic zinc ion battery, characterized in that: The invention comprises a positive electrode, an electrolyte and a negative electrode, wherein the positive electrode component comprises dimethylphenazine, and the electrolyte is the organic zinc ion battery electrolyte according to claims 1 to 7.

9. The organic zinc ion battery according to claim 8, characterized in that: The positive electrode components also include activated carbon, carbon black and polytetrafluoroethylene.

10. The organic zinc ion battery according to claim 9, characterized in that: The mass ratio of dimethylphenazine, activated carbon, carbon black and polytetrafluoroethylene is (5~10):(5~10):(0.5~2):(0.5~2).

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