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Composite air electrode of lithium air cell and preparation method thereof

A lithium-air battery, air electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems affecting the battery's high rate performance, reducing oxygen permeability, increasing electrode polarization, etc., to achieve good air permeability , Good water blocking effect, reducing the effect of battery polarization

Inactive Publication Date: 2012-07-04
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, the positive active material of lithium-air battery is oxygen in the air, so the battery must be an open system, but the water vapor in the air will permeate through the electrode and corrode the metal lithium negative electrode, resulting in battery failure. Ji-Guang Zhang et al. A layer of HDPG (high-density polyethylene), PTFE (polytetrafluoroethylene), and Melinex?301H (Dupont) waterproof and breathable layer is attached to the surface of the air electrode, resulting in a decrease in oxygen transmission rate , affect the high rate performance of the battery, or coat a layer of silicon rubber and other materials on the air electrode, resulting in increased electrode polarization
Both result in poor battery performance [J.G. Zhang, D. Wang, W. Xu, J. Xiao, R.E. Williford, J. Power Sources 195 (2010) 4332]

Method used

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  • Composite air electrode of lithium air cell and preparation method thereof
  • Composite air electrode of lithium air cell and preparation method thereof
  • Composite air electrode of lithium air cell and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] 1. The air-diffused carbon carrier layer is coated on the nickel foam current collector through mesoporous carbon slurry. First, the foam

[0022] Nickel was washed with acetone and deionized water in turn, and then dried in the air, and carbon paper was vacuum-dried at 80°C for 12h. Mesoporous carbon KB (Kenjet Balck) was mixed with PVDF, and N-methylpyrrolidone was used as a solvent, mixed evenly, evenly coated on nickel foam or carbon paper, the solvent was evaporated to dryness, and placed in vacuum at 80°C for 12h.

[0023] 2. Preparation of proton-doped polyaniline with high conductivity. Slowly add aniline to 2 mol / L HCl solution, ultrasonically disperse for 12 h, (NH 4 ) 2 S 2 o 8 Dissolve in 20 mL of deionized water, add it dropwise to the solution while stirring, react at 25°C for 4-6 h, filter the precipitate by centrifugation, wash with 2M HCl solution first, then wash with deionized water, and dry at 60°C for 24h.

[0024] 3. The proton-doped polyani...

Embodiment 2

[0031] 1. The air-diffused carbon carrier layer is coated on the foamed nickel current collector through mesoporous carbon slurry. First, the nickel foam was washed with acetone and deionized water in sequence, then dried in air, and vacuum-dried with carbon paper at 80 °C for 12 h. Mesoporous carbon KB (Kenjet Balck) was mixed with PVDF, and N-methylpyrrolidone was used as a solvent, mixed evenly, and evenly coated on carbon paper, the solvent was evaporated to dryness, and placed in vacuum at 80°C for 12h.

[0032] 2. Then prepare proton-doped polyaniline with high conductivity, aniline is slowly added to 2 mol / L HCl solution, ultrasonically dispersed for 12 h, (NH 4 ) 2 S 2 o 8 Dissolve in 20 mL of deionized water, add it dropwise to the solution while stirring, react at 25°C for 4-6 h, filter the precipitate by centrifugation, wash with 2M HCl solution first, then wash with deionized water, and dry at 60°C for 24h.

[0033] 3. The proton-doped polyaniline powder mater...

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Abstract

The invention belongs to the technical field of lithium air cells and particularly relates to a composite air electrode of a lithium air cell and a preparation method thereof. The composite air electrode is a composite multilayer structure comprising a gas diffusion layer, a fluid collecting layer and a waterproof layer; and the composite air electrode structure is formed by adopting a porous foam material as a substrate and using a coating and laminating method, wherein the waterproof layer adopts high-conductivity proton-doped polyaniline. The design of the electrode is good, and the high air diffusivity is retained, so that the cell has better magnification performance, and meanwhile, the waterproof layer of the electrode can effectively prevent water vapor in air from corroding lithium metal.

Description

technical field [0001] The invention belongs to the technical field of lithium-air batteries, and in particular relates to a composite air electrode of a lithium-air battery and a preparation method thereof. Background technique [0002] With the continuous development of the economy, it will inevitably lead to the depletion of global resources and the deterioration of the environment. Human beings must grasp the balance between the "three Es" of economic growth, environmental protection and energy security. The comprehensive and high-efficiency development and utilization of new energy, low energy consumption technology, and environmental technology has become a very necessary topic, and research and development of high energy density power supply systems and their materials is imperative. At the same time, with the miniaturization of electrical appliances, people pay more and more attention to the research and development of batteries with high specific energy. [0003] ...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 余爱水付正浩黄桃
Owner FUDAN UNIV
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