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Chargeable zinc electrode additive, and its preparing method and use

A technology of additives and zinc electrodes, which is applied in the direction of electrode manufacturing, battery electrodes, active material electrodes, etc., can solve the problem of reducing the utilization rate and conductivity of zinc negative electrode active materials, the improvement efficiency of cycle life is not large, and the cycle life of zinc-nickel batteries Short and other issues, to achieve the effect of improving comprehensive electrochemical performance, improving cycle life, improving utilization rate and discharge capacity

Inactive Publication Date: 2007-08-22
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the short cycle life of the zinc-nickel battery and other major problems have not been effectively resolved, the large-scale industrial production of the battery is still difficult
[0005] However, the commonly used additives for rechargeable zinc electrodes generally have a short-lasting modification effect, reduce the utilization rate and conductivity of the active material of the zinc negative electrode, increase the internal resistance of the battery, and some additives are also highly toxic to the environment.
Therefore, the current single negative electrode additive has little effect on the overall electrochemical performance of zinc-nickel batteries, especially the cycle life.

Method used

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  • Chargeable zinc electrode additive, and its preparing method and use
  • Chargeable zinc electrode additive, and its preparing method and use
  • Chargeable zinc electrode additive, and its preparing method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of additive of rechargeable zinc electrode, its chemical composition is: the Bi of 92 weight parts ZnO, 5.5 weight parts 2 o 3 , 2.5 parts by weight of Co 2 o 3 , 0.075 parts by weight of Nb 2 o 5 , 0.025 parts by weight of Y 2 o 3 , and its particle size distribution is 0.1-1.0 μm.

[0022] The preparation method of the additive of the aforementioned rechargeable zinc electrode is: ZnO powder, Co 2 o 3 Powder, Bi 2 o 3 Powder and Nb 2 o 5 The powder is mixed according to the stoichiometric ratio, then put into the ball mill tank, and distilled water and polyacrylamide dispersant are added into the ball mill tank, the powder is wet milled in the ball mill tank for 60 hours, dried and then calcined at 1000°C for 2 hour, after cooling, sieve to get the intermediate raw material;

[0023] Dissolving tetrabutyl titanate in a mixed solution of glacial acetic acid, glycerol and ethanol, heating and stirring to obtain a uniform tetrabutyl titanate solution;...

Embodiment 2

[0029] A kind of additive of rechargeable zinc electrode, its chemical composition is: the Co of 95 weight parts ZnO, 5 weight parts 2 o 3 , and its particle size distribution is 0.1-1.0 μm.

[0030] The preparation method of the additive of the aforementioned rechargeable zinc electrode is: ZnO powder, Co 2 o 3 The powder is mixed according to the stoichiometric ratio, then put into the ball mill tank, and distilled water and polyacrylamine dispersant are added into the ball mill tank, the powder is wet milled in the ball mill tank for 30 hours, dried and then calcined at 700 ° C for 2 Hours, cooled and sieved to obtain additives for rechargeable zinc electrodes.

[0031] Add the additive powder of the prepared rechargeable zinc electrode with a particle size of 0.1 to 1.0 μm into zinc oxide (the zinc oxide contains about 20% metal zinc zinc powder), and the weight ratio of the additive to the zinc oxide is 1:9, Then mix it in a ball mill for 1 hour, take it out and add a...

Embodiment 3

[0034] A kind of additive of rechargeable zinc electrode, its chemical composition is: the Co of 98 weight parts ZnO, 2 weight parts 2 o 3 , and its particle size distribution is 0.1-1.0 μm.

[0035] The preparation method of the additive of the aforementioned rechargeable zinc electrode is: ZnO powder, Co 2 o 3 The powder is mixed according to the stoichiometric ratio, then put into the ball mill tank, and distilled water and polyacrylamine dispersant are added into the ball mill tank, the powder is wet milled in the ball mill tank for 50 hours, dried and then calcined at 1000°C for 1.5 Hours, cooled and sieved to obtain additives for rechargeable zinc electrodes.

[0036] Add the additive powder of the prepared rechargeable zinc electrode with a particle size of 0.1 to 1.0 μm into zinc oxide (the zinc oxide contains about 20% metal zinc zinc powder), and the weight ratio of the additive to the zinc oxide is 1:9, Then mix it in a ball mill for 1 hour, take it out and add ...

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Abstract

Main chemistry constitutes of the Additive is ZnO and Co2O3. Conducting oxides such as Bi2O3íóCo2O3, Nb2O5, Y2O3, La2O3 can be added to the additive. Using mode of mixing and grinding solids, the method dopes Bi, Co, Nb elements; and using method of sol, the method leads in adulterants of Y and La elements and tetrabutyl titanate. Advantages are: (1) the zinc oxide based conducting oxide can be as center of crystallization; increasing use ratio of active material and discharge capacity, and reducing and preventing generation of tree like crystal of zinc, and raising cycle life of electrode; (2) reducing internal resistance of electrode as well as preventing zinc from solved in electrolyte, and hydrogen from separating out.

Description

(1) Technical field [0001] The invention relates to an additive for a rechargeable zinc electrode. (2) Background technology [0002] Zinc-nickel battery is a novel high-energy secondary battery developed in recent years. It uses zinc as the negative electrode and nickel hydroxide as the positive electrode. It has high specific energy (326Wh / kg in theory, not less than 115Wh / kg in practice) , high current discharge (more than 200W / kg specific power), high working voltage (average 1.65V), stable discharge, low cost, no environmental pollution and other outstanding advantages, is a new type of power battery, with a wide range of applications and development prospect. Other types of alkaline secondary zinc batteries also have broad application prospects. [0003] However, due to the short cycle life of the zinc-nickel battery and other major problems have not been effectively resolved, the large-scale industrial production of the battery is still difficult. The main reason i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/02H01M4/04
CPCY02E60/12Y02E60/10
Inventor 张文魁涂江平黄辉甘永平
Owner ZHEJIANG UNIV OF TECH
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