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Secondary zinc electrode additive and its preparing method

An additive and electrode technology, which is applied in the field of secondary zinc electrode additives and its preparation, can solve the problems of reducing the utilization rate and conductivity of the active material of the zinc negative electrode, the improvement effect of the cycle life is not large, and the modification effect is not lasting, etc. Improve comprehensive electrochemical performance, reduce internal resistance and prevent dissolution

Inactive Publication Date: 2007-11-14
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, the commonly used electrode additives generally have a short-lasting modification effect, which reduces the utilization rate and conductivity of the active material of the zinc negative electrode, increases the internal resistance of the battery, and some additives are also relatively toxic to the environment.
Therefore, the current single negative electrode additive has little effect on improving the comprehensive electrochemical performance of zinc-nickel batteries, especially the cycle life.

Method used

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  • Secondary zinc electrode additive and its preparing method
  • Secondary zinc electrode additive and its preparing method
  • Secondary zinc electrode additive and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A secondary zinc electrode additive, which consists of: 80 parts by weight of ZnO, 5 parts by weight of Bi 2 o 3 , 5 parts by weight of Al 2 o 3 , 10 parts by weight of C (graphite), the particle size of the additive is 0.1-1.0 μm, the graphite powder is natural graphite powder, which contains 10% by mass of short graphite fibers. ZnO, Bi 2 o 3 、Al 2 o 3 , graphite powder and short fibers are weighed according to the proportion, add distilled water and polyacrylamine dispersant, the polyacrylamine dispersant is 3% of the mass of the mixture of oxides and graphite, and mix in a ball mill for 2 hours to form a uniform slurry The substance is then grouted into spherical particles, dried and sintered in a muffle furnace for 2 hours at a temperature of 1500°C to form a powder, then crushed into a powder shape in a ball mill after cooling, and then sieved to obtain a particle size of 0.1~1.0μm secondary zinc electrode additive powder finished product.

[0028]Add the ...

Embodiment 2

[0032] A secondary zinc electrode additive, its chemical composition is: 80 parts by weight of SnO 2 , 5 parts by weight of Bi 2 o 3 , 5 parts by weight of Al 2 o 3 10 parts by weight of C (graphite), the particle size of the additive is 0.1-1.0 μm, and the graphite powder is natural graphite powder, which contains 10% short graphite fibers. SnO 2 、 Bi 2 o 3 、Al 2 o 3 , graphite powder and short fibers are weighed according to the proportion, add distilled water and polyacrylamine dispersant, the polyacrylamine dispersant is 0.1% of the mass of the mixture of oxides and graphite, and mix in a ball mill for 2 hours to form a uniform slurry The material is then grouted into spherical particles, dried and sintered in a muffle furnace for 3 hours at a temperature of 1500 ° C to form a powder, and then crushed into a powder shape in a ball mill, and then sieved to obtain a particle size of 0.1~1.0μm secondary zinc electrode additive powder finished product.

[0033] Add t...

Embodiment 3

[0037] A secondary zinc electrode additive, its chemical composition is: 10 parts by weight of ZnO, 80 parts by weight of SnO 2 10 parts by weight of C (graphite), the particle size of the additive is 0.1-1.0 μm, and the graphite powder is natural graphite powder, which contains 10% short graphite fibers. ZnO, SnO 2 , graphite powder and short fibers are weighed according to the proportion, add distilled water and polyacrylamine dispersant, the polyacrylamine dispersant is 0.5% of the mixture mass of each oxide and graphite, and ball mill in a ball mill for 1.5 hours to form a uniform slurry After being dried, it is sintered in a muffle furnace at a temperature of 1200°C for 6 hours, and after cooling, it is crushed into a powder shape in a ball mill, and then sieved to obtain the particle size. It is a finished product of secondary zinc electrode additive powder with a thickness of 0.1-1.0 μm.

[0038] Add the prepared secondary zinc electrode additive powder to zinc oxide ...

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Abstract

Primary chemical composition of the additive is Re and C, where Re is as ZnO or SnO2 or their admixture; C is as graphite. The additive also can be conducting oxides including Sb2O3, Bi2O3, Al2O3, SiO2 etc. Each oxide and graphite are mixed and sintered to form a certain shape. Advantages are: (1) the additive 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. The invention possesses favorable effect for improving synthetical electrochemical performance of secondary zinc electrode.

Description

(1) Technical field [0001] The invention relates to a secondary zinc electrode additive and a preparation method thereof. (2) Background technology [0002] In recent years, with the rapid development of electronics, communication and IT industries, various portable electronic products such as notebook computers, various communication equipment, cordless phones, MP3, digital cameras, electric tools and other products have developed rapidly. The demand for secondary batteries is very strong, and the performance of batteries is also getting higher and higher. Therefore, the development of secondary batteries with high specific energy density, small size, long life, high current discharge, no pollution to the environment, and low price Chemical power supply is very urgent. [0003] Zinc electrode has excellent electrochemical performance, and its theoretical specific capacity can reach 820mAh / g. It is an excellent electrode material, high-performance secondary zinc electrode, ...

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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