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Air positive electrode for lithium-air battery and preparation method thereof

A lithium-air battery and air positive electrode technology, which is applied to battery electrodes, fuel cell half-cells, primary battery-type half-cells, circuits, etc., can solve the problems of battery performance degradation, high positive electrode density, and low porosity. Achieve the effect of improving stability, reducing overvoltage and low density

Active Publication Date: 2016-07-27
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These by-products, lithium carbonate, will gradually accumulate during the cycle, leading to gradual degradation of battery performance and eventual failure
Another technical solution for the air cathode is to use non-carbon materials to support catalysts, such as gold nanoparticles on nickel nanowires and ruthenium nanoparticles on indium tin oxide. Although these methods can effectively reduce the occurrence of side reactions and improve cycle life, However, usually the positive electrode density is relatively high and the porosity is not high, resulting in low specific capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put 100mg of titanium metal at one end of the quartz tube of a tube furnace, mix 8mg of multi-walled carbon nanotubes and 40mg of iodine evenly, and place them at the other end of the quartz tube, 8cm away from the metal titanium. Vacuum to a vacuum of 1×10 -3 Torr. Raise the temperature and control the reaction temperature at 550°C, and react for 10 hours; during the heating process, the temperature rise rate is controlled at 10°C / min. After the reaction is completed, the temperature is lowered to room temperature, the product is washed with ethanol for several times, and dried to obtain a carbon nanotube / TiC support material. The prepared loading material was put into a condensation sputtering apparatus, and the platinum nanoparticle catalyst was loaded by sputtering deposition method, the current was controlled at 15mA, and the precipitation time was 60s. Mix the product and PVDF binder uniformly at a mass ratio of 8:2, add N-methyl-2-pyrrolidone (NMP) solvent to m...

Embodiment 2

[0021] Put 100mg of titanium metal at one end of the quartz tube of a tube furnace, mix 8mg of multi-walled carbon nanotubes and 40mg of iodine evenly, and place them at the other end of the quartz tube, 8cm away from the metal titanium. Vacuum to a vacuum of 1×10 -3 Torr. Raise the temperature and control the reaction temperature at 550°C, and react for 10 hours; during the heating process, the temperature rise rate is controlled at 10°C / min. After the reaction is completed, the temperature is lowered to room temperature, the product is washed with ethanol for several times, and dried to obtain a carbon nanotube / TiC support material. Take out 5 mg of the carrier material, add it into 30 mL of a mixed solvent of deionized water and isopropanol (volume ratio 50:50), stir and disperse for later use. 0.5mL0.1MAuCl 3 ·HCl·4H 2 The O solution was dropped into 10 mL of 5 mM trisodium citrate, and then the pH was adjusted to 5.5 by adding 0.05 M NaOH solution dropwise. This solu...

Embodiment 3

[0023] Place 180mg of niobium metal at one end of the quartz tube of the tube furnace, mix 8mg of multi-walled carbon nanotubes and 40mg of iodine element evenly, and place them at the other end of the quartz tube, 8cm away from the niobium metal. Vacuum to a vacuum of 1×10 -3 Torr. Raise the temperature and control the reaction temperature at 800°C, and react for 10 hours; during the heating process, the temperature rise rate is controlled at 10°C / min. After the reaction is completed, cool down to room temperature, wash the product with ethanol for several times, and dry to obtain the carbon nanotube / NbC air cathode composite carrier material. The prepared loading material was put into a condensation sputtering apparatus, and the gold nanoparticle catalyst was loaded by sputtering deposition method, the current was controlled at 10mA, and the precipitation time was 45s. Mix the product and PVDF binder uniformly at a mass ratio of 8:2, add N-methyl-2-pyrrolidone (NMP) solven...

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Abstract

The invention discloses an air positive electrode for a lithium-air battery and a preparation method thereof. The air positive electrode is composed of a catalyst carrier material, a nanometer electrochemical catalyst, a binder and a current collector, wherein the catalyst carrier material is prepared by compounding a carbon material and transition metallic carbide, the carbon material is used as an internal skeleton, the transition metallic carbide coats the surface of the carbon material, and the nanometer electrochemical catalyst is loaded on the surface of the catalyst carrier material. The preparation method comprises the following steps: (1) placing the carbon material, elemental iodine and transition metal in a vacuum tube furnace, carrying out a reaction at a temperature of 400 to 950 DEG C so as to produce a carbon carrier material coated by the transition metallic carbide; (2) loading the carrier material with the nanometer electrochemical catalyst; (3) uniformly mixing a material obtained in the step (2) with the binder, adding an NMP solvent and carrying out blending to obtain a slurry-like substance; and (4) uniformly coating the current collector with the slurry-like substance and carrying out vacuum drying so as to obtain the air positive electrode for the lithium-air battery. The air positive electrode obtained in the invention has high stability and high specific capacity.

Description

technical field [0001] The invention relates to an air cathode for a lithium-air battery and a preparation method thereof, belonging to the technical field of electrochemical energy materials. Background technique [0002] Li-air batteries have attracted extensive attention and extensive research due to their ultrahigh specific energy. At present, one of the important research contents of lithium-air batteries is the design and optimization of air cathodes. Generally, air cathodes are composed of porous carbon materials supporting catalysts. On the one hand, the porous carbon material serves as the skeleton of the air cathode, providing oxygen mass transfer channels and electron transport media; 2 o 2 Provide enough storage space and have a high specific capacity. Selecting a suitable catalyst can effectively promote the charge-discharge reaction, reduce the overvoltage of charge-discharge, and improve energy utilization efficiency. [0003] However, there are serious p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M12/06
Inventor 卢世刚李永伟赵尚骞庄卫东尹艳萍
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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