Carbon-based composite positive electrode material for lithium-air battery and preparation method of carbon-based composite positive electrode material

A technology for composite positive electrode materials and lithium-air batteries, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve problems such as the inability to prepare catalytic positive electrode material systems for lithium-air, achieve multiple catalytic reaction active sites, enhance crystallinity and Dispersion, effect of reducing surface energy

Active Publication Date: 2016-07-27
江苏先进无机材料研究院
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  • Abstract
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  • Application Information

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Problems solved by technology

[0007] The present invention aims to overcome the technical problem of being unable to prepare a catalytic positive electrode material system for lithium-air, and the present invention provides a carbon-based composite positive electrode material for lithium-air batteries

Method used

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  • Carbon-based composite positive electrode material for lithium-air battery and preparation method of carbon-based composite positive electrode material
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  • Carbon-based composite positive electrode material for lithium-air battery and preparation method of carbon-based composite positive electrode material

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preparation example Construction

[0044] The invention provides a method for preparing a carbon-based composite cathode material for a lithium-air battery, comprising the following steps:

[0045] (1) Add a certain amount of carbon material into ethylene glycol, mix, sonicate, and prepare a suspension containing carbon material;

[0046] (2) Slowly add a certain amount of ionic liquid into the above suspension, accompanied by magnetic stirring during the whole process, so that the solution is fully and evenly mixed;

[0047] (3) Add a certain amount of hydrochloric acid solution of the noble metal precursor to the above-mentioned uniformly mixed solution, place it in an oil bath at 150-220° C. for 3-5 hours in a condensing reflux device, then cool, centrifuge, filter, and dry, That is, the desired carbon-based composite cathode material for the lithium-air battery is obtained.

[0048] The step (1) is: weigh a certain amount of carbon material, dissolve it in ethylene glycol, ultrasonicate for 3-5 minutes, st...

Embodiment 1

[0070] 1) Preparation of nanoscale Ru-imidazole-type ionic liquid-multi-walled carbon nanotube composite cathode material:

[0071] Weighing 30 mg of multi-walled carbon nanotubes was added to 60 mL of ethylene glycol, ultrasonicated for 5 minutes, and stirred for 3 hours to obtain a suspension of multi-walled carbon nanotubes. Then, while stirring, slowly drop 1100uL 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm]BF 4 ) ionic liquid, ultrasonicated for 5 minutes, and continuously stirred for 4 hours to obtain a fully mixed solution. Then add 22.5 mg RuCl to the solution 3 The mixed solution in 1.5mL of 0.1mol / L hydrochloric acid was placed in an oil bath at 190°C. After 3 hours, the temperature was naturally cooled, and the reaction precipitate was repeatedly washed by centrifugation with ethanol and deionized water, and the described product was obtained after air drying at room temperature. composite material. The SEM and TEM of Ru-ionic liquid-multi-walled carbon ...

Embodiment 2

[0075] 1) Preparation of nanoscale Pd-imidazole type ionic liquid-graphene composite cathode material:

[0076] Weigh 25 mg of graphene and add it into 60 mL of ethylene glycol, sonicate for 5 minutes, and stir for 3 hours to obtain a suspension of graphene. Then, while stirring, slowly drop 1000uL 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm]BF 4 ) ionic liquid, ultrasonicated for 5 minutes, and continuously stirred for 4 hours to obtain a fully mixed solution. Then add 39.1mgPd(C 2 h 3 o 2 ) 2 Dissolve in 1.5mL of 0.1mol / L hydrochloric acid solution, place in an oil bath at 200°C for 3 hours, then cool down naturally, wash the reaction precipitate repeatedly with ethanol and deionized water, and dry it with air at room temperature to obtain Pd- ions Liquid-graphene composite; the specific surface area of ​​the composite is 200m 2 / g, the metal particle size is 5nm, and the thickness of the protective layer is 2nm;

[0077] 2) Electrode preparation, battery ass...

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Abstract

The invention relates to a carbon-based composite positive electrode material for a lithium-air battery and a preparation method of the carbon-based composite positive electrode material. The carbon-based composite positive electrode material comprises a carbon material, a protection layer and precious metal particles, wherein the protection layer wraps the surface of the carbon material and is composed of an ionic liquid, and the precious metal particles are dispersed in the ionic liquid in a nanoparticle form so as to modify the surface of the carbon material.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a noble metal-ionic liquid-carbon composite cathode material for a lithium-air battery and a preparation method thereof. Background technique [0002] Currently, humans consume approximately 1.4×10 13 W of energy, of which oil consumption accounts for about 34% of the total primary energy consumption, resulting in CO 2 A large amount of emissions of greenhouse gases have caused a serious "greenhouse effect". In recent years, a large amount of research focus has been shifted to the field of electric vehicles in order to reduce the use of fossil fuels and the emission of greenhouse gases. Therefore, the research and development of hybrid electric vehicles, extended-range electric vehicles and pure electric vehicles has aroused extensive interest of researchers. However, the energy density of lithium-ion batteries currently widely used is low, which limits the mile...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 李驰麟娄沛莉崔忠慧郭向欣
Owner 江苏先进无机材料研究院
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