Silicon-based cathode composite material for lithium ion battery and preparation method thereof

A technology of composite materials and silicon materials, which is applied in the field of porous silicon-based negative electrode composite materials for lithium-ion batteries, can solve the problems of high production cost of silicon-based negative electrode materials, polluting industrialized production, complex processes, etc., and achieve low production costs and increased electrical conductivity , The effect of simple process
CN102324501BActive Publication Date: 2013-10-16河北中芯凤华科技发展有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
河北中芯凤华科技发展有限公司
Publication Date
2013-10-16

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Abstract

The invention discloses a silicon-based cathode composite material for a lithium ion battery and a preparation method thereof. The cathode composite material is a Si / CuOx / C composite material (0<=x<=1) with a porous structure. Silicon with a porous structure is used as a base, and CuOx particles are inserted in the pores, and carbons with different forms are distributed on a surface and pore walls of the silicon-based material. The preparation method of the cathode composite material comprises steps that silicon material realizes pore-forming through an in situ catalytic reaction between silicon and halogenated hydrocarbon, and reaction condition parameters are regulated to control pore size, distribution and amount of porosity of the silicon material; a post-modification technology is employed to carry out modifications on the surface and the pore walls of the porous silicon, so as to obtain the Si / CuOx / C composite material with a porous structure. The porous silicon-based cathode composite material has low production costs, simple process and no pollution, and is suitable for industrialized production; besides the porous silicon-based cathode composite material has high charge and discharge capacity, small initial irreversible capacity and good cycle performance.
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Description

technical field

[0001] The invention relates to the field of battery materials, in particular to a porous silicon-based negative electrode composite material for a lithium ion battery, a preparation method and application thereof. Background technique

[0002] Compared with traditional secondary batteries, lithium-ion batteries have the advantages of high open circuit voltage, high energy density, long service life, no memory effect, no pollution, and small self-discharge, and are more and more widely used. Due to the rapid development and wide application of portable electronic devices and electric vehicles, there is an urgent need for lithium-ion batteries with high specific energy, long cycle life, and fast charge and discharge. The current commercial lithium-ion battery anode material is carbon-based anode material, but its theoretical capacity is only 372mAh / g, and it has been developed close to the theoretical value. It can no longer adapt to the miniaturization devel...

Claims

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