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Preparation method of graphene-coated silicon-carbon composite anode material and lithium ion battery

A graphene-coated, silicon-carbon composite technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as rapid capacity decay, and achieve the effects of reduced expansion rate, excellent electrical conductivity, and tight bonding

Inactive Publication Date: 2016-10-26
江苏中兴派能电池有限公司 +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of a graphene-coated silicon-carbon composite negative electrode material and a lithium-ion battery, which can effectively solve the problem of the volume of the existing silicon-carbon composite material and the lithium-ion battery prepared by it during the charge-discharge cycle. The problem of rapid capacity decay caused by expansion

Method used

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  • Preparation method of graphene-coated silicon-carbon composite anode material and lithium ion battery

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preparation example Construction

[0027] A preparation method of a graphene-coated silicon-carbon composite negative electrode, comprising the steps of:

[0028] Step 1) Prepare a graphene-coated silicon-carbon composite negative electrode slurry by fully and effectively dispersing the nano-silicon material, graphite, graphene, graphite oxide, organic polymer and solvent;

[0029] Among them, the mass fraction of nano-silicon material accounts for 30%-90%, the mass fraction of graphite and graphite oxide accounts for 0%-30%, and the mass fraction of graphene accounts for 2%-30%. The mass fraction of the substance accounts for 5%-30%, and the balance is a solvent;

[0030] Step 2) coating the silicon-carbon composite negative electrode slurry coated with graphene on the metal current collector;

[0031] Step 3) After the coated negative electrode is calcined at high temperature and rapidly cooled in a short period of time, the graphene-coated silicon-carbon composite negative electrode finally used for lithium...

Embodiment

[0043] A preparation method of a graphene-coated silicon-carbon composite negative electrode, comprising the steps of:

[0044] Step 1) Prepare graphene-coated silicon-carbon composites by ultrasonically dispersing nano-silicon materials, graphite, S-substituted graphene, graphite oxide, polyacrylonitrile, and N,N-dimethylformamide with a particle size distribution of 100 nm. Negative electrode slurry, wherein the mass fraction of nano-silicon material accounts for 30%, the mass fraction of graphite and graphite oxide accounts for 5%, the mass fraction of graphene accounts for 20%, and the mass fraction of polyacrylonitrile accounts for 15%. %, the balance is solvent N,N-dimethylformamide;

[0045] Step 2) coating the silicon-carbon composite negative electrode slurry coated with graphene on the copper foil;

[0046] Step 3) Under a helium atmosphere, the negative electrode that has been coated is controlled at a rate of 10° C. / min to control the final temperature of the nega...

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Abstract

The invention discloses a preparation method of a graphene-coated silicon-carbon composite anode material and a lithium ion battery including the anode. The preparation method of the carbon composite anode includes the steps of: ultrasonic-dispersing nano silicon material, graphite, graphene, graphite oxide, an organic high-molecular polymer and a solvent to prepare silicon-carbon composite anode slurry; coating a metal current collector with the slurry and drying the slurry to form a silicon-carbon composite anode sheet; and performing thermal treatment to the silicon-carbon composite anode sheet at 300-800 DEG C under protection of an inert gas, wherein the organic high-molecular polymer in the silicon-carbon composite anode is subjected to the thermal treatment and is cyclized, so that nano silicon anode material is tightly combined with modified graphene to form an elastic network structure, thus ensuring strength and flexibility of the electrode and ensuring certain porosity.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a preparation method of a graphene-coated silicon-carbon composite negative electrode material and a lithium ion battery. Background technique [0002] Lithium-ion batteries have become ideal supporting power sources for portable electronics, mobile products, and electric vehicles due to their high voltage, high specific energy, long cycle life, and environmental friendliness. At present, the anode materials of lithium-ion batteries are mostly carbon-based materials, such as mesocarbon microspheres, graphite, organic pyrolytic carbon, hard carbon, etc. Carbon-based materials have good reversible lithium deintercalation performance, but their reversible capacity is low (theoretical capacity 372mAh / g), and the lithium intercalation potential is low (0.25-0.05V vs. Li+ / Li), which is close to the potential of metal lithium. Lithium dendrites are easy to form during charging and di...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/38H01M4/1393H01M4/1395H01M10/0525
CPCH01M4/1393H01M4/1395H01M4/362H01M4/366H01M4/386H01M4/583H01M10/0525Y02E60/10
Inventor 鲍添增马紫峰杨庆亨巢亚军廖小珍武洪彬何雨石
Owner 江苏中兴派能电池有限公司
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