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Silicon-carbon composite material, preparation method thereof, lithium battery negative electrode material and lithium battery

A technology of silicon-carbon composite materials and lithium batteries, applied in battery electrodes, carbon preparation/purification, secondary batteries, etc., can solve the problem of low surface loading, uneven carbon coating, and low compaction density of silicon-carbon materials, etc. question

Pending Publication Date: 2020-10-23
YINLONG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a silicon-carbon composite material, its preparation method, lithium battery negative electrode material and lithium battery, so as to solve the problem of silicon-carbon material pressure caused by uneven carbon coating in nano-silicon composite materials in the prior art. Problems with low solid density and low area loading

Method used

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  • Silicon-carbon composite material, preparation method thereof, lithium battery negative electrode material and lithium battery
  • Silicon-carbon composite material, preparation method thereof, lithium battery negative electrode material and lithium battery
  • Silicon-carbon composite material, preparation method thereof, lithium battery negative electrode material and lithium battery

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preparation example Construction

[0025] In a typical implementation of the present application, a method for preparing a silicon-carbon composite material is provided, which includes: step S1, mixing nano-silicon, carbon source, etchant, binder and solvent , to obtain the mixture; step S2, the mixture is subjected to a carbonization treatment to obtain a graphene-like carbon film-coated silicon material; step S3, the graphene-like carbon film-coated silicon material, carbon series conductive agent and polymer conductive agent are mixed 1. Compacting and molding to obtain a molding blank; and step S4, performing secondary carbonization treatment on the molding blank to obtain a silicon-carbon composite material; wherein, the etchant is an alkali metal salt.

[0026] The nano-silicon in the above-mentioned mixture of the present application reduces the temporary agglomeration between the nano-silicon to a certain extent under the dilution of the carbon source, etchant, binder and solvent, and then utilizes the e...

Embodiment 1

[0046] Add 300g of silicon powder into 4L of isopropanol, grind it with a pin-type dispersing mill until the particle D50 is 80-100nm, transfer the slurry to a nano-dispersing machine, add 45g PVB, 60g KCl, and 300g PVDF in sequence, and disperse for 30 minutes. Spray drying to obtain a mixture; the mixture is subjected to the first carbonization treatment at 800° C. for 2 hours under a nitrogen protective atmosphere to obtain a graphene-like carbon film-coated silicon material. Disperse the graphene-like carbon film-coated silicon material in 8% hydrochloric acid solution and stir for 2 hours to remove the potassium salt in the graphene-like carbon film-coated silicon material to obtain the acid-washed silicon-carbon material, and the pickled silicon-carbon After the material was washed with water, it was dried in an oven at 80°C for 12 hours to obtain a graphene-like carbon film-coated silicon material.

[0047] 100g of graphene-like carbon film-coated silicon material, 150g...

Embodiment 2

[0049] The difference between embodiment 2 and embodiment 1 is that

[0050] KCl is 115g, and the silicon-carbon composite material is finally obtained.

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Abstract

The invention provides a silicon-carbon composite material, a preparation method thereof, a lithium battery negative electrode material and a lithium battery. The preparation method comprises the following steps: S1, mixing nano silicon, a carbon source, an etching agent, a binder and a solvent to obtain a mixture; S2, performing primary carbonization treatment on the mixture to obtain a graphene-like carbon film coated silicon material; S3, mixing the graphene-like carbon film coated silicon material, a carbon series conductive agent and a polymer conductive agent, and carrying out compactionmolding to obtain a molded material blank; and S4, carrying out secondary carbonization treatment on the molded material blank to obtain the silicon-carbon composite material; wherein the etching agent is an alkali metal salt. Through the synergistic effect of the primary carbonization treatment and the secondary carbonization treatment, the silicon-carbon composite material with longer cycle life and better rate capability is obtained.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a silicon-carbon composite material, a preparation method thereof, a lithium battery negative electrode material and a lithium battery. Background technique [0002] With the rapid development of pure electric vehicles, it is imminent to increase the energy density of power lithium-ion batteries. In terms of negative electrodes, silicon has the advantages of the highest theoretical specific capacity, low charge and discharge platform, and abundant reserves. It is the best candidate material for the next generation of high specific energy lithium ion negative electrode materials. However, the huge volume expansion defect of silicon in the alloying process severely limits its cycle performance, and the poor intrinsic conductivity and ion conductivity of silicon affect its rate performance. Therefore, researchers have made some researches on silicon-based materials. related modif...

Claims

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Application Information

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IPC IPC(8): C01B32/05C01B32/182C01B33/02H01M4/38H01M4/62H01M10/0525
CPCC01B33/02C01B32/05C01B32/182H01M4/386H01M4/628H01M4/625H01M10/0525Y02E60/10
Inventor 胡海玲尚永亮张正李海军蔡惠群
Owner YINLONG ENERGY CO LTD
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