Electro-catalyst of zinc-air battery and method for making same

A zinc-air battery and electrocatalyst technology, which is applied in the direction of catalyst activation/preparation, battery electrodes, chemical instruments and methods, etc., can solve the problems of inability to meet the needs of high-power electrical appliances, poor chemical stability of metal Co elements, and discharge current of zinc-air batteries. Low-level problems, to achieve the effect of abundant reserves, short heat treatment time and low price

Inactive Publication Date: 2008-01-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. With spinel LiCo x mn 2-x o 4 The discharge current of zinc-air batteries made of catalysts is still low, which cannot meet the needs of some high-power electrical appliances.
[0005] 2. The price of Co materials is high, which makes the cost of commercialization of its materials also high
[0006] 3. In the alkaline electrolyte, the chemical stability of metal Co is poor, which affects the service life of the battery formed by it

Method used

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  • Electro-catalyst of zinc-air battery and method for making same

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A preparation method for an electrocatalyst for a zinc-air battery, comprising the steps of:

[0030] In the first step, LiNO was weighed according to the stoichiometric molar ratio Li:Ni:Mn=1.00:0.20:1.80 3 , Ni(CH 3 COO) 2 4H 2 O and 50 wt% Mn(NO 3 ) 2 solution, distilled water was added to form a saturated aqueous solution.

[0031] In the second step, citric acid and ethylene glycol are added to the above reaction system, and the pH of the reaction system is adjusted to 5.0 with ammonia water. Wherein, the molar ratio of citric acid:ethylene glycol:total metal ions is 3.0:4.0:1.0.

[0032] The third step is to heat the reaction system in a constant temperature water bath at 80°C to gradually evaporate the water to obtain a transparent sol, continue to dehydrate for 4 hours to form a wet gel, and then heat and dry the wet gel at 120°C for 12 hours to obtain Honeycomb-shaped xerogel, and finally heat-treat the xerogel at 500°C for 6 hours in an air atmosphere, ...

Embodiment 2

[0037] A preparation method for an electrocatalyst for a zinc-air battery, comprising the steps of:

[0038] In the first step, LiNO was weighed according to the stoichiometric molar ratio Li:Ni:Mn=1.00:0.10:1.90 3 , Ni(CH 3 COO) 2 4H 2 O and 50 wt% Mn(NO 3 ) 2 solution, distilled water was added to form a saturated aqueous solution.

[0039] In the second step, citric acid and ethylene glycol are added to the above reaction system, and the pH of the reaction system is adjusted to 5.0 with ammonia water. Wherein, the molar ratio of citric acid:ethylene glycol:total metal ions is 3.0:4.0:1.0.

[0040] The third step is to heat the reaction system in a constant temperature water bath at 80°C to gradually evaporate the water to obtain a transparent sol, continue to dehydrate for 3 hours to form a wet gel, and then heat and dry the wet gel at 120°C for 12 hours to obtain Honeycomb-shaped xerogel, and finally heat-treat the xerogel at 500°C for 6 hours in an air atmosphere, ...

Embodiment 3

[0044] A preparation method for an electrocatalyst for a zinc-air battery, comprising the steps of:

[0045] In the first step, LiNO was weighed according to the stoichiometric molar ratio Li:Ni:Mn=1.00:0.50:1.50 3 , NiC 2 o 4 2H 2 O and 50 wt% Mn(NO 3 ) 2 solution, distilled water was added to form a saturated aqueous solution.

[0046] In the second step, citric acid and ethylene glycol are added to the above reaction system, and the pH of the reaction system is adjusted to 5.5 with ammonia water. Wherein, the molar ratio of citric acid:ethylene glycol:total metal ions is 2.0:3.5:1.0.

[0047] The third step is to heat the reaction system in a constant temperature water bath at 90°C to gradually evaporate the water to obtain a transparent sol, continue to dehydrate for 2 hours to form a wet gel, and then heat and dry the wet gel at 100°C for 16 hours to obtain Honeycomb-shaped xerogel, and finally heat-treat the xerogel at 900°C for 1 hour in an air atmosphere, and th...

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Abstract

The invention discloses a clectrocatalyst for zinc-air batteries and a preparation method. The general formula of the clectrocatalyst is LiNixCoyFezMn2-x-y-zO4, wherein x is more than or equal to 0.10 and less than or equal to 0.50, y is more than or equal to 0 and less than or equal to 0.50, and z is more than or equal to 0 or less than or equal to 0.50. The crystalline structure of the clectrocatalyst is spinel-type crystalline structure. The clectrocatalyst of the invention has high electro-catalytic activity and good chemical stability, and the raw materials needed for the preparation of the clectrocatalyst has rich reserves and low prices; and the uniform doping of different metals in the clectrocatalyst outcome can be realized and an outcome with uniform structure at the molecular level can be obtained within a short time. The clectrocatalyst of the invention requires low heat treatment temperature and short heat treatment time, and the obtained outcome has high purity and narrow particle size distribution. And the reaction process and the microstructure of the sol-gel are easy to be controlled, resulting in little side effects, high outcome conversion rate, and thus having high outcome quality and production efficiency.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to an electrocatalyst with a spinel crystal structure used as a zinc-air battery and a preparation method thereof. Background technique [0002] Zinc-air batteries have a history of more than 100 years since their inception. It is a chemical power source that uses oxygen in the air as the positive electrode active material and metal zinc as the negative electrode active material. Under the catalysis of the catalyst, a chemical reaction occurs to generate current. As long as the zinc electrode is not consumed, oxygen can continuously reach the electrochemical reaction interface through the air diffusion electrode to react with zinc to continuously generate electric energy. This kind of battery has the advantages of high specific energy, stable discharge voltage, cheap and easy-to-obtain raw materials, and no environmental pollution, and has broad application prospects...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B01J23/889B01J37/00
CPCY02E60/50
Inventor 周震涛陈水生于非
Owner SOUTH CHINA UNIV OF TECH
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