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Catalyst for air electrode of zinc-air cell

A technology of zinc-air battery and air electrode, which is applied in the field of electrochemistry, and can solve the problems of inapplicability, expensive precious metals, and low catalytic activity

Inactive Publication Date: 2004-03-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditionally used activated carbon, electrolytic MnO 2 The catalytic activity of the catalyst is low, so that the reaction rate of oxygen on the electrochemical interface is slow, thus limiting the discharge current density of the battery
Later, some people used noble metals instead of activated carbon or MnO 2 As a catalytic material to improve the catalytic activity of the air electrode, but the price of precious metals is expensive, and the current density of the catalyst cell using it as a catalyst still cannot meet the requirements of the use of household electronic appliances, so it cannot be applied on a large scale

Method used

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  • Catalyst for air electrode of zinc-air cell
  • Catalyst for air electrode of zinc-air cell
  • Catalyst for air electrode of zinc-air cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] First put electrolytic MnO 2 It is converted into nitrate, and then the nitrates of Li, Mn, and Co with a molar ratio of 1:1.99:0.01 are uniformly mixed with citric acid to obtain a transparent solution. Adjust the pH value to 7.5-8.5 by slowly adding ammonia water, place it in a 70-90℃ water bath and heat it to form a transparent sol, and then dry it at 130-160℃ for 15-20 hours to get a transparent gel. Then, the obtained gel prepolymer is heated in a horse boiling furnace, heated to a target temperature of 300° C. in an air atmosphere, and kept for 5-7 hours, and then cooled to room temperature along with the furnace.

[0016] Using 20% ​​by weight polytetrafluoroethylene (PTFE) emulsion as a binder, it is rolled into a catalytic film with a thickness of about 0.1mm, which is superimposed on the breathable film and conductive nickel mesh to form an area of ​​about 1cm 2 The left and right electrodes are tested for the steady-state current-voltage polarization curve, and t...

Embodiment 2

[0018] First put electrolytic MnO 2 It is converted into nitrate, and then the nitrates of Li, Mn, and Co are mixed uniformly with citric acid in a ratio of 1:1.99:0.01 to obtain a transparent solution. The pH value is adjusted to 7.5-8.5 by slowly adding ammonia water. Place it in a water bath at 70-90°C for heating and dehydration to form a transparent sol, and then dry it at 130-160°C for 15-20 hours to obtain a transparent gel, and then put the gel prepolymer into a horse boiling furnace to heat it in the air The atmosphere is heated to the target temperature of 460°C and kept for 5-7 hours, and then cooled to room temperature with the furnace.

[0019] Using 20% ​​by weight polytetrafluoroethylene (PTFE) emulsion as a binder, it is rolled into a catalytic film with a thickness of about 0.1mm, which is superimposed on the breathable film and conductive nickel mesh to form an area of ​​about 1cm 2 The left and right electrodes are tested for the steady-state current-voltage pol...

Embodiment 3

[0021] First put electrolytic MnO 2 It is converted into nitrate, and then the nitrate of Li, Mn, Co and citric acid with a molar ratio of 1:1.95:0.05 are mixed uniformly to obtain a transparent solution. The pH value is adjusted to 7.5-8.5 by slowly adding ammonia water. Place it in a water bath at 70-90°C for heating and dehydration to form a transparent sol, and then dry it at 130-160°C for 15-20 hours to obtain a transparent gel, and then put the gel prepolymer into a horse boiling furnace to heat it in the air The atmosphere is heated to the target temperature of 460°C and kept for 5-7 hours, and then cooled to room temperature with the furnace.

[0022] Using 20% ​​by weight polytetrafluoroethylene (PTFE) emulsion as a binder, it is rolled into a catalytic film with a thickness of about 0.1mm, which is superimposed on the breathable film and conductive nickel mesh to form an area of ​​about 1cm 2 The left and right electrodes are tested for the steady-state current-voltage p...

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Abstract

The metal elements of Li and Co are mixed in the electrolytic MnO2, and the sol-gel method is used to synthesize metal composite oxide catalyst with spinelle type crystal structure. The catalyst is low in cost, and its activity is high, and can raise discharged current density of zinc air cell.

Description

Technical field [0001] The invention is a catalyst for the air electrode of a zinc-air battery in the electrochemical field. Background technique [0002] Zinc-air battery has a history of more than one hundred years since its inception. It uses metallic zinc as the negative electrode active material and oxygen in the air as the positive electrode active material. The two active materials are catalyzed by the catalytic layer of the air electrode at the interface between the air electrode and the electrolyte to undergo an electrochemical reaction to generate electrical energy. As long as the zinc electrode is not consumed, oxygen can continuously reach the electrochemical reaction interface through the air diffusion electrode and react with zinc to continuously generate electricity. This kind of battery has the advantages of high specific energy, low cost, stable discharge performance, etc., and has a huge market prospect. However, the discharge current...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M6/04H01M12/06
CPCY02E60/50
Inventor 周震涛周晓斌
Owner SOUTH CHINA UNIV OF TECH