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

A technology of silicon-based composite materials and composite powders, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as capacity fading, achieve the effects of reduced volume effect, small size, and slow down the speed of capacity fading

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

AI Technical Summary

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-based composite material prepared by the prior art method and the lithium-ion battery prepared therefrom during charging and discharging, and to provide a silicon-based composite material with excellent cycle performance. Preparation method of composite material

Method used

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

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Embodiment 1

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

[0033] (1) SiO x (0.5≤x≤1.5) powder mixed with conductive carbon material

[0034] SiO 0.9 Powder (300 mesh) and graphite (150 mesh) as a highly conductive carbon material are added to the ball mill tank of the planetary ball mill, in which SiO 0.9 The mass ratio to graphite is 1 / 9; the ball milling beads are steel balls with a diameter of 20 mm and 60 mm, wherein the mass ratio of the milling beads to the material to be milled is 6; the speed of the ball milling is 400 rpm, and the ball milling is 4 hours to obtain the mixture.

[0035] (2) Coated carbon precursor

[0036] Take the above mixture, add water, wherein the mass ratio of water to mixture is 5; add polyvinyl alcohol and sucrose as carbon precursors, wherein the carbon precursor and SiO 0.9 The mass ratio of the powder is 5, wherein the mass ratio of polyvinyl alcohol to sucrose is 1:1; the above materials are...

Embodiment 2

[0048] This embodiment provides a method for preparing a silicon-based composite material, including:

[0049] (1) SiO x (0.5≤x≤1.5) powder mixed with conductive carbon material

[0050] SiO 1.5 (300 mesh) and carbon nanotubes (150 mesh) as a highly conductive carbon material are added to the ball mill tank of the planetary ball mill, in which SiO 1.5 The mass ratio to carbon nanotubes is 0.5; 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 milling is 300 rpm, and the ball milling is 2h to obtain the mixture.

[0051] (2) Coated carbon precursor

[0052] Take the above mixture, add water, wherein the mass ratio of water to mixture is 12; add sucrose as a carbon precursor, wherein sucrose and SiO 1.5 The mass ratio of the powder is 3; the above materials are stirred evenly to obtain a suspension, and the suspension is spray-dried, wherein the tempera...

Embodiment 3

[0061] This embodiment provides a method for preparing a silicon-based composite material, including:

[0062] (1) SiO x (0.5≤x≤1.5) powder mixed with conductive carbon material

[0063] SiO 0.5 Powder (300 mesh) and expanded graphite (150 mesh) as a highly conductive carbon material are added to the ball mill tank of the planetary ball mill, in which SiO 0.5 The mass ratio to graphite is 9; the ball milling beads are steel balls with a diameter of 20 mm and 60 mm, wherein the mass ratio of the milling beads to the material to be milled is 6; the speed of the ball milling is 500 rpm, and the ball milling is 8 hours to obtain the mixture.

[0064] (2) Coated carbon precursor

[0065] Take the above mixture, add water, wherein the mass ratio of water to mixture is 7; add glucose as a carbon precursor, wherein glucose and SiO 0.5 The mass ratio of the powder is 0.5; the above materials are stirred evenly to obtain a suspension, and the suspension is spray-dried, wherein the t...

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Abstract

The invention provides a silicon-based composite material and a preparation method thereof, a silicon-carbon composite material, and a lithium ion battery containing the materials, 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-based composite material and the lithium ion battery prepared by using the silicon-based composite material in the charge and discharge processes. The preparation method of the silicon-based composite material, disclosed by the invention, comprises the steps of: mixing SiOx (x is smaller than or equal to 1.5 and greater than or equal to 0.5) and a conductive carbon substrate to obtain compound powder of the SiOx ( the x is smaller than or equal to 1.5 and greater than or equal to 0.5); and coating the compound powder by a carbon precursor to obtain a coating and carrying out carbonization reaction on the coating. The silicon-based composite material and the silicon-carbon composite material with an excellent cycle performance are obtained by selecting proper technological parameters, and the lithium ion battery containing the materials is prepared. The composite materials disclosed by the invention are prepared by using the method, and the lithium ion battery disclosed by the invention contains the composite materials.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a silicon-based composite material and a preparation method thereof, a silicon-carbon composite material, and a lithium-ion battery containing a 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 ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48
CPCY02E60/12Y02E60/10
Inventor 曾绍忠赵志刚阴山慧屈耀辉
Owner CHERY AUTOMOBILE CO LTD
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