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Aqueous zinc ion battery and formation method

A technology of zinc ion battery and water system, which is applied in the direction of battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problem that energy storage devices and small electronic devices cannot meet the requirements of battery energy density, and the electrical performance cannot be fully obtained. The problems of low initial discharge capacity and low initial discharge capacity can reduce the chemical reaction barrier, improve the contact interface, and improve the cycle performance and specific capacity.

Active Publication Date: 2021-11-12
浙江金羽新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A variety of low-valence manganese oxides have been disclosed as positive electrode materials for zinc-ion batteries, but in actual use, these materials have low initial discharge capacity and require multiple cycles to achieve their stable charge-discharge performance; at the same time , the electrical properties of the existing low-priced manganese cathode materials have not been fully utilized, and the actual discharge capacity is less than half of the theoretical capacity (about 300mAh / g), which cannot meet the requirements of energy storage devices and small electronic devices for battery energy density. It is the main factor restricting the further widespread application of this type of aqueous zinc-manganese battery

Method used

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  • Aqueous zinc ion battery and formation method

Examples

Experimental program
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Effect test

Embodiment 1

[0106] Weigh Mn with a mass ratio of 70:10:5:15 2 o 3 , acetylene black conductive agent, carbon nanotubes, polyvinylidene fluoride (PVDF) binder, dissolve PVDF in an appropriate amount of 1-methyl-2-pyrrolidone (NMP), stir until completely dissolved, and then grind evenly Mn 2 o 3 Add acetylene black and carbon nanotubes to the above solution, and continue to stir to ensure that the slurry is evenly mixed. Then the slurry was uniformly coated on a stainless steel foil disc (12 mm in diameter), and dried in a vacuum oven at 100° C. to obtain a positive electrode sheet.

[0107] The prepared positive electrode sheet, metal zinc sheet, and glass fiber membrane were assembled into a zinc ion battery, and the electrolyte was a mixed aqueous solution of 0.01mol / L sodium dodecylbenzenesulfonate and 1.5mol / L zinc sulfate. The mass content of sodium dodecylbenzenesulfonate in the electrolyte is 0.3%.

[0108] Formation method: during the charging process, the rate current within t...

Embodiment 2

[0114] The sodium dodecylbenzenesulfonate in embodiment 1 is changed into hexadecyltrimethylammonium chloride, and others are the same as embodiment 1.

[0115] Such as figure 2 As shown, after replacing the conversion accelerator, the positive electrode material has also formed a morphology with nanosheet aggregates after 20 cycles, but compared with Example 1, some unconverted positive electrode materials can still be seen, and the nanosheets therein The size is larger than that of Example 1. When the size is larger, the contact area with the electrolyte will be reduced, thereby affecting the capacity performance.

[0116] The cycle performance of embodiment 2 cathode material is as follows Figure 6 As shown, after 12 cycles of formation, the cathode material reached its highest discharge specific capacity of 168.8mAh g -1 , slightly lower than Example 1, but its discharge capacity continued to decline after the 20th cycle, and it was only 117.1mAh g when the cycle reach...

Embodiment 3

[0118] Weigh Mn with a mass ratio of 50:15:5:30 3 o 4 , acetylene black conductive agent, carbon nanotubes, polyvinylidene fluoride (PVDF) binder, dissolve PVDF in an appropriate amount of 1-methyl-2-pyrrolidone (NMP), stir until completely dissolved, and then grind evenly MnO Add acetylene black and carbon nanotubes to the above solution, and continue to stir to ensure that the slurry is evenly mixed. Then the slurry was uniformly coated on a stainless steel foil disc (12 mm in diameter), and dried in a vacuum oven at 100° C. to obtain a positive electrode sheet.

[0119] The prepared positive electrode sheet, metal zinc sheet, and glass fiber membrane are assembled into a zinc ion battery, and the electrolyte is 3.5mol / L bis(trifluoromethanesulfonic acid)imide lithium and 0.8mol / L zinc sulfate, 0.5mol / L A mixed aqueous solution of lithium sulfamate and 0.5mol / L sodium sulfate. The mass content of lithium bis(trifluoromethanesulfonate)imide in the electrolyte is 0.5%.

[...

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Abstract

The invention relates to an aqueous zinc ion battery. The aqueous zinc ion battery comprises a positive electrode, a negative electrode and an electrolyte, wherein the negative electrode comprises a zinc-containing material, the electrolyte comprises a conductive salt and water, the conductive salt comprises a zinc salt, the positive electrode comprises a manganese-containing oxide, the manganese-containing oxide is composed of a manganese element and an oxygen element, and the valence state of the manganese element is lower than +4. The aqueous zinc ion battery needs to be subjected to a formation step before being used; the formation step comprises charging and discharging; after the manganese oxide is subjected to the formation step, the manganese oxide is gradually converted into a second morphology from an initial morphology; and the second morphology is a sheet-shaped or microchip-shaped aggregate. By adjusting an electrolyte environment and a positive electrode material, a contact interface between the positive electrode material and the electrolyte can be improved, the transformation morphology of the positive electrode material is regulated and controlled, and the positive electrode material is promoted to be transformed into a nanosheet aggregate penetrating through the internal space of the electrode, so a contact area between the positive electrode material and the electrolyte is larger, the migration path of electrons is shorter, and the discharge capacity of the battery can be comprehensively improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an aqueous zinc ion battery and a formation method. Background technique [0002] Secondary battery is a kind of battery that can be repeatedly charged and discharged, which is widely used at present. Its application involves many fields, among which lithium-ion battery is the most widely used. However, due to the disadvantages of high cost, unfriendly environment, and unsafety brought by the use of organic electrolytes, it is not suitable for large-scale energy storage systems. Batteries using safe and low-cost aqueous electrolytes can precisely meet these requirements compared with non-aqueous batteries. However, the lithium storage in nature is limited. With the rapid development of lithium-related industries, lithium depletion will come sooner or later; in addition, due to the narrow stable potential window of aqueous solution, the energy density of aqueous lithium-ion bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36H01M4/50H01M10/44
CPCH01M10/36H01M4/50H01M10/446Y02E60/10
Inventor 黄杜斌王春源李爱军杨扬
Owner 浙江金羽新能源科技有限公司
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