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Preparation method of water battery zinc cathode material

A zinc negative electrode and battery technology, applied in battery electrodes, fuel cell half-cells and secondary battery-type half-cells, circuits, etc., can solve the problem of battery discharge capacity and rate performance cannot be maintained, electrode porosity and reaction The specific surface area is reduced, and the problem of densification of zinc powder electrodes cannot be solved, achieving the effects of low cost, simple operation, and less pollution

Inactive Publication Date: 2019-02-12
ZHEJIANG WELLY ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, ordinary conductive additives, whether zero-dimensional or one-dimensional or other shapes, cannot solve the problem of densification of the zinc powder electrode caused by the redistribution of active materials in the zinc anode. With the repeated charging and discharging of the battery, The porosity of the electrode and the specific surface area of ​​the reaction decrease rapidly, and the diffusion channels of the ions participating in the electrochemical reaction are blocked, which eventually leads to the improvement of the discharge capacity and rate performance of the battery and cannot be maintained, and the cycle life of the battery is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Prepare raw material solution B: zinc sulfate concentration 2 mol / liter, complexing agent boric acid concentration 0.01 mol / liter, complexing agent trisodium citrate 0.01 mol / liter, add graphene 0.01 g / liter, solvent is a mixed solvent of water and ethanol , wherein the volume ratio of water and ethanol is 90:10. Prepare raw material solution A: the concentration of sodium phosphate is 0.8 mol / liter, and the solvent is water. The raw material solution B is slowly added to the continuously stirring raw material solution A for reaction, and the reaction temperature of the mixed solution is controlled to be 100°C. The end point of the control reaction system is that zinc precipitation is complete, and the judgment end point is the total amount of zinc in the total reaction and The total molar ratio of phosphate radicals is 1:1. The mother liquor is removed by centrifugation, and the precipitate is washed with deionized water until there is no sulfate group in the precipit...

Embodiment 2

[0034] Prepare raw material solution B: zinc chloride concentration 2 mol / liter, complexing agent boric acid concentration 0.01 mol / liter, complexing agent edetate disodium 0.01 mol / liter, solvent is water and ethanol mixed solvent, wherein water and The volume ratio of ethanol is 90:10. Raw material solution A was prepared: sodium phosphate concentration was 0.8 mol / liter, graphene was added at 0.01 g / liter, and the solvent was a mixed solvent of water and ethanol, wherein the volume ratio of water and ethanol was 90:5. Slowly add the raw material solution B into the continuously stirring raw material solution A to react, and control the reaction temperature of the mixed solution to 0°C, and control the end point of the reaction system to be the complete precipitation of zinc, wherein the judgment end point is the total amount of zinc in the total reaction and The total molar ratio of phosphate radicals is 3:2. The mother liquor is removed by centrifugation, and the precipit...

Embodiment 3

[0036]Prepare raw material solution B: zinc sulfate concentration 2 mol / liter, complexing agent boric acid concentration 0.01 mol / liter, complexing agent trisodium citrate 0.01 mol / liter, add graphene 0.01 g / liter, solvent is a mixed solvent of water and ethanol , wherein the volume ratio of water and ethanol is 90:10. Prepare raw material solution A: the concentration of sodium pyrophosphate is 0.6 mol / liter, and the solvent is water. Slowly add the raw material solution B into the continuously stirring raw material solution A to react, and control the reaction temperature of the mixed solution to 0°C, and control the end point of the reaction system to be the complete precipitation of zinc, wherein the judgment end point is the total amount of zinc in the total reaction and The total molar ratio of pyrophosphate is 1:1. The mother liquor is removed by centrifugation, and the precipitate is washed with deionized water until there is no sulfate group in the precipitate, and f...

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Abstract

The invention relates to a preparation method of a water battery zinc cathode material. By controlling solution reaction, one or a mixture of zinc phosphate, zinc pyrophosphate and zinc tripolyphosphate, namely the zinc cathode material, is obtained. The method for preparing the zinc cathode material has the characters of being simple in process, low in cost and little in pollution. The zinc cathode material prepared by adopting the method can be used in battery systems of alkaline and neutral aqueous solutions, is a proper electrode active material, is low in cost and high in activity, and has wide application prospects in the energy-storage aspects of electric tools, electrocars, power grids and the like.

Description

technical field [0001] The invention belongs to the field of electrochemical engineering and industrial devices, and in particular relates to a method for preparing a zinc negative electrode material of an aqueous battery in the technical field of battery production, which can be used as an electrode active material in a battery system of alkaline and neutral aqueous solutions. Background technique [0002] The alkaline zinc-air secondary battery has the advantages of high capacity, high open circuit voltage, low cost of raw materials, environmental friendliness and safety, and is a green, high-energy and environment-friendly secondary battery. However, zinc-air secondary batteries are susceptible to the densification of the zinc negative electrode, the passivation during the discharge process, and the deformation and dendrite growth during the charge process, resulting in low discharge capacity of the battery, rapid capacity decay during discharge, and unstable capacity. As...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M12/08
CPCH01M4/364H01M4/5825H01M12/08Y02E60/10
Inventor 汪晓俊靳文超权学军刘佩吴奎辰吴清国
Owner ZHEJIANG WELLY ENERGY CORP
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