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

A silicon-carbon composite material and composite powder technology, applied in the field of lithium-ion batteries, can solve problems such as capacity decay, and achieve the effects of reduced volume effect, small size, and short process flow

Active Publication Date: 2013-03-20
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of capacity fading caused by the volume effect of the silicon-carbon composite material prepared by the prior art method and the lithium-ion battery prepared by it in the charging and discharging process, and to provide a silicon-carbon composite material with excellent cycle performance Preparation method of composite material

Method used

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

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Effect test

Embodiment 1

[0032] This embodiment provides a method for preparing a silicon-carbon composite material, including:

[0033] (1) Silica, conductive carbon material and metal compound

[0034] Add fumed silica (particle size: 30nm) to be ball-milled, graphite (150 mesh) as a conductive carbon material, and metal calcium particles (particle size: 1mm) into the ball mill tank of the planetary ball mill, in which fumed silica and The mass ratio of graphite is 1 / 9, and the quality of calcium metal particles is 70% of the theoretical calcium particle quality required for reducing fumed silica to silicon; reaction with metal), wherein the mass of toluene is 70% of the mass of the material to be milled; the ball milling beads are steel balls with a diameter of 20mm and 60mm, and the mass ratio of the milling beads to the material to be milled is 6; the speed of the ball milling is 400 rpm , ball milled for 4 hours to obtain a composite powder.

[0035] (2) Reduction reaction

[0036] Take the d...

Embodiment 2

[0045] This embodiment provides a method for preparing a silicon-carbon composite material, including:

[0046] (1) Silica, conductive carbon material and metal compound

[0047] Add the porous silica gel to be ball-milled, acetylene black as conductive carbon material, and metal sodium particles (particle size 1mm) into the ball mill tank of the planetary ball mill, wherein the mass ratio of porous silica gel to acetylene black is 0.5, and the mass ratio of metal sodium particles The quality is 50% of the theoretical sodium metal particles required for reducing the porous silica gel to silicon; then add ether as an alkane dispersant in the ball mill jar, wherein the quality of ether is 50% of the mass of the material to be ball milled; the ball milling beads have a diameter of 20mm and 60mm steel balls, wherein the mass ratio of the milling balls to the material to be milled is 6; the rotational speed of the ball milling is 300 rpm, and the ball milling is 2 hours to obtain a c...

Embodiment 3

[0056] This embodiment provides a method for preparing a silicon-carbon composite material, including:

[0057] (1) Silica, conductive carbon material and metal compound

[0058] Add the mesoporous silica to be ball-milled, the vapor-grown carbon fiber and metal potassium particles (particle size 1mm) as the conductive carbon material into the ball milling tank of the planetary ball mill, wherein the mass of the mesoporous silica and the vapor-grown carbon fiber Ratio is 9, and the quality of metal potassium particle is 100% of the theoretical metal potassium particle quality required for reducing mesoporous silica to silicon; The mass is 150% of the mass of the material to be milled; the ball milling beads are steel balls with a diameter of 20mm and 60mm, wherein the mass ratio of the milling beads to the material to be milled is 6; the speed of the ball mill is 500 rpm, and the ball mill is 8h to obtain a composite powder .

[0059] (2) Reduction reaction

[0060] Take th...

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Abstract

The invention provides a silicon-carbon composite material and a preparation method thereof, and a lithium ion battery containing the material, belongs to the technical field of lithium ion batteries, and can solve the problem of capacity fading caused by a volume effect of the existing silicon-carbon composite material and the lithium ion battery prepared by using the silicon-carbon composite material in the charge and discharge processes. The preparation method of the silicon-carbon composite material, disclosed by the invention, comprises the steps of: mixing silicon dioxide, a conductive carbon material and metal to obtain compound powder, carrying out reduction reaction, and pickling to remove metal oxide. The silicon-carbon composite material with an excellent cycle performance is obtained by selecting proper technological parameters, and the lithium ion battery containing the silicon-carbon composite material is prepared.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a silicon-carbon composite material and a preparation method thereof, and a lithium-ion battery containing the silicon-carbon composite material. Background technique [0002] At present, the lithium-ion batteries used in production mainly use graphite-based negative electrode materials, but the theoretical lithium intercalation capacity of graphite is 372mAh / g, but it has actually reached 370mAh / g. Therefore, there is almost no room for improvement in the capacity of graphite-based negative electrode materials. [0003] In the past ten years, a variety of new high-capacity and high-rate negative electrode materials have been developed, among which silicon-based materials have become a research hotspot due to their high mass specific capacity (the theoretical specific capacity of silicon is 4200mAh / g). The material is accompanied by serious volume expans...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M10/0525H01M4/134B82Y30/00
CPCY02E60/122Y02E60/10
Inventor 曾绍忠屈耀辉赵志刚阴山慧
Owner CHERY AUTOMOBILE CO LTD
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