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MoO2/amorphous carbon coated silicon-carbon composite material as well as preparation method and application thereof

A silicon-carbon composite material and amorphous carbon technology, applied in the field of negative electrode materials and lithium-ion batteries, preparation, and silicon-carbon composite materials, can solve the problems of large volume expansion and poor electrical conductivity, and achieve large volume expansion and good mechanical stress. , the effect of enhancing stability

Pending Publication Date: 2022-03-25
YINLONG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to provide MoO 2 / Amorphous carbon-coated silicon-carbon composite material and its preparation method and application, in order to solve the problem of large volume expansion and poor conductivity of silicon material as the negative electrode material of battery in the prior art

Method used

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  • MoO2/amorphous carbon coated silicon-carbon composite material as well as preparation method and application thereof
  • MoO2/amorphous carbon coated silicon-carbon composite material as well as preparation method and application thereof
  • MoO2/amorphous carbon coated silicon-carbon composite material as well as preparation method and application thereof

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preparation example Construction

[0033] In another typical embodiment of the present application, a kind of MoO is provided 2 / The preparation method of amorphous carbon-coated silicon-carbon composite material, the above preparation method includes: step S1, mixing silicon material, carbon-based material, binder and organic solvent to make a mixed slurry; step S2, for the above The mixed slurry is dried to obtain a silicon-carbon composite material; step S3, (NH 4 ) 4 Mo 7 o 24 , the amorphous carbon raw material and the first solvent are mixed to obtain the first liquid dispersion; step S4, the silicon-carbon composite material is mixed with the first liquid dispersion to form a mixture, and the mixture is heated to obtain the doped MoO 2 An amorphous carbon wet gel that will be doped with MoO 2 The amorphous carbon wet gel was dried to obtain doped MoO 2 Amorphous carbon xerogel; step S5, for doped MoO 2 The amorphous carbon xerogel was pyrolyzed to obtain MoO 2 / Amorphous carbon-coated silicon-carb...

Embodiment 1

[0051] 1) Disperse nano-scale silicon powder (average particle diameter 2nm) in methanol to prepare silicon slurry, make the silicon slurry and graphene evenly mixed in a ball mill, adopt zirconium balls as grinding balls, and stir the ball mill at 300rpm / min, carry out the grinding reaction for 4h, then add polyvinyl butyral, so that the nano-scale silicon powder, graphene and polyvinyl butyral are uniformly mixed to obtain a mixed slurry;

[0052] 2) Using a spray drying method to remove methanol in the above mixed slurry to obtain a silicon-carbon composite material, the above spray drying is carried out under an argon atmosphere, the inlet temperature of the spray drying is 120°C, and the outlet temperature is 50°C;

[0053] 3) 15g (NH 4 ) 6 Mo 7 o 24 and 1.5g of acetylene were added to 750mL of deionized water to dissolve, and mechanically mixed for 2 hours to obtain the first liquid dispersion;

[0054] 4) Mechanically mixing the above-mentioned first liquid dispers...

Embodiment 2

[0058] 1) Disperse nano-scale silicon powder (average particle diameter 2nm) in methanol to prepare silicon slurry, make the silicon slurry and graphene evenly mixed in a ball mill, adopt zirconium balls as grinding balls, and stir the ball mill at 300rpm / Min, carry out grinding reaction 4h, add polyurethane then, make nano-scale silicon powder, graphene and polyurethane mix uniformly, obtain mixed slurry;

[0059] 2) Using a spray drying method to remove the methanol in the above mixed slurry to obtain a silicon-carbon composite material, the above spray drying is carried out under an argon atmosphere, the inlet temperature of the spray drying is 200°C, and the outlet temperature is 90°C;

[0060] 3) 15g (NH 4 ) 6 Mo 7 o 24 and 1.5g of acetylene were added to 750mL of deionized water to dissolve, and mechanically mixed for 2 hours to obtain the first liquid dispersion;

[0061] 4) Mechanically mixing the above-mentioned first liquid dispersion with the above-mentioned si...

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Abstract

The invention provides a MoO2 / amorphous carbon coated silicon-carbon composite material as well as a preparation method and application thereof. The MoO2 / amorphous carbon coated silicon-carbon composite material comprises the following components in percentage by mass: 5-42% of a silicon material; 57.5-95% of a carbon-based material and amorphous carbon; the silicon-carbon composite material is prepared from a silicon material, a carbon-based material and 0.05-0.5% of MoO2, the MoO2 is dispersed in amorphous carbon, the silicon material and the carbon-based material are compounded to form the silicon-carbon composite material, and the surface of the silicon-carbon composite material is coated with the MoO2 / amorphous carbon. According to the MoO2 / amorphous carbon coated silicon-carbon composite material, the silicon material, the carbon-based material, MoO2 and amorphous carbon cooperate with one another, so that the high-capacity characteristic of the silicon material can be fully played, and the volume buffering effect of the carbon material can be fully played, and therefore, the MoO2 / amorphous carbon coated silicon-carbon composite material has excellent electrochemical performance and can be applied to the field of lithium ion batteries. A good electron transmission channel can be provided, and the conductivity of the composite material is improved.

Description

technical field [0001] The present invention relates to the field of lithium ion batteries, in particular to MoO 2 / Amorphous carbon-coated silicon-carbon composite material, preparation method, negative electrode material and lithium-ion battery. Background technique [0002] With the development of lithium battery technology, the upgrading of negative electrode materials is an inevitable trend. The upgrade of graphite negative electrode system to silicon-based negative electrode system is the main direction. The specific capacity of silicon-based negative electrode materials can reach several times that of natural graphite electrodes and artificial graphite electrodes. The application in lithium batteries will greatly increase the upper limit of energy density. Graphite anode is the current mainstream anode material. The actual specific capacity of artificial graphite and modified natural graphite has basically reached the theoretical gram capacity of graphite of 372mAh / g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/0525
CPCH01M4/624H01M4/625H01M4/628H01M4/386H01M10/0525H01M2004/027H01M2004/021
Inventor 舒梨曹萌张正李武义郭华彬胡海玲
Owner YINLONG ENERGY CO LTD
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