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Method for reducing solubility of discharging product of zinc electrode

A zinc electrode and solubility technology, applied in the field of electrochemistry, can solve the problems of short cycle life of zinc batteries, high solubility of zinc electrode discharge products, etc., and achieve the effect of shortening service life and reducing solubility

Inactive Publication Date: 2011-05-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome problems such as excessive solubility of zinc electrode discharge products in alkaline electrolytes and short cycle life of zinc batteries, the present invention provides a method for reducing the solubility of zinc electrode discharge products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dissolve 27g of potassium hydroxide, 1g of lithium hydroxide, 8g of potassium fluoride dihydrate, 12g of potassium carbonate, 0.05g of tetramethylammonium hydroxide, and 0.6g of sodium hexametaphosphate into 100mL of water to prepare an alkaline electrolyte, and Calcium zincate is used as the zinc electrode to carry out battery charging and discharging in combination with conventional methods.

[0031] The solubility of the zinc electrode discharge product in the above-mentioned electrolyte is detected by the following method: take 100mL of the above-mentioned electrolyte, add 10g of calcium zincate, let it stand for 2 days, and make the calcium zincate reach saturation in the electrolyte; take out the supernatant, and static After settling for clarification for 1 day, take 10ml of the clarified solution, and drop excess hydrochloric acid into the clarified solution to make the precipitate disappear, so as to neutralize the potassium hydroxide in the electrolyte, and sim...

Embodiment 2

[0035] Dissolve 20g of potassium hydroxide, 2g of lithium hydroxide, 8g of potassium fluoride dihydrate, 4g of potassium carbonate, 0.2g of sodium hexametaphosphate, and 0.24g of hexadecyltrimethylammonium bromide in 100mL of water to form an alkaline Electrolyte, and calcium zincate as the zinc electrode is combined according to the conventional method to charge and discharge the battery.

[0036] Detect the solubility of zinc electrode discharge product in above-mentioned electrolytic solution by following method: take above-mentioned electrolytic solution 100ml, add 10g calcium zincate, stand for 3 days, make calcium zincate reach saturation in electrolytic solution; Take out supernatant liquid, and static After setting for clarification for 2 days, take 10ml of the clarified solution, and drop excess hydrochloric acid into the clarified solution to make the precipitate disappear, to neutralize the potassium hydroxide in the electrolyte, and simultaneously make the calcium z...

Embodiment 3

[0040] Take 50g of potassium hydroxide, 3g of lithium hydroxide, 12g of potassium fluoride dihydrate, 4g of potassium carbonate, 0.05g of tetramethylammonium hydroxide, 0.4g of sodium hexametaphosphate, and 0.75g of cetyltrimethylammonium bromide Dissolve in 100mL water to make an alkaline electrolyte, and use calcium zincate as a zinc electrode to combine according to conventional methods for battery charge and discharge.

[0041] Detect the solubility of zinc electrode discharge product in above-mentioned electrolytic solution by following method: take above-mentioned electrolytic solution 100ml, add 10g calcium zincate, stand for 3 days, make calcium zincate reach saturation in electrolytic solution; Take out supernatant liquid, and static After setting for clarification for 1 day, take 10ml of the clarified solution, and drip excess hydrochloric acid into the clarified solution to make the precipitate disappear, to neutralize the potassium hydroxide in the electrolyte, and ...

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PUM

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Abstract

The invention provides a method for reducing solubility of a discharging product of a zinc electrode. In the method, charging and discharging of a cell are carried out by preparing an alkaline electrolyte and combining the alkaline electrolyte and calcium zincate serving as a zinc electrode according to a conventional method, wherein the alkaline electrolyte comprises the following components: 0.2-0.5g / mL potassium hydroxide, 0.01-0.03g / mL lithium hydroxide, 0.08-0.12g / mL potassium fluoride dihydrate, 0.04-0.24g / mL potassium carbonate and 0.002-0.006g / mL sodium hexametaphosphate. By utilizing the electrolyt and application method of the electrolyt provided by the invention, the solubility of the discharging product of the zinc electrode in the electrolyt is reduced by more than 80%, and the problem of shorthand zinc battery service life caused by overlarge solubility of the discharging product of the zinc electrode in the alkaline electrolyt is solved.

Description

technical field [0001] The invention relates to a method for reducing the solubility of zinc electrode discharge products in alkaline electrolyte, belonging to the field of electrochemistry. Background technique [0002] Zinc electrode has excellent properties such as high specific energy, abundant resources, low price, low toxicity, no environmental pollution, low equilibrium potential, and good reversibility, and is widely used as an anode material for alkaline batteries. However, due to the short cycle life of zinc electrodes, alkaline secondary batteries with zinc as the anode have not appeared in large numbers. The reason is that ZnO, the discharge product of zinc electrodes, dissolves too much in alkaline electrolytes, which is one of the main reasons for the short cycle life of zinc electrodes. reason. [0003] The zinc electrode discharge product ZnO dissolves too much in the electrolyte, which leads to the formation of dendrites or serious deformation of the zinc e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/26H01M4/48
CPCY02E60/10
Inventor 吴桢芬张正富苏有勇赵逸群
Owner KUNMING UNIV OF SCI & TECH
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