Lithium ion battery silicon oxide composite negative electrode material and preparation method thereof

A lithium-ion battery and silicon oxide technology, applied in battery electrodes, circuits, electrical components, etc., to achieve the effect of cheap raw materials, simple production process, and improved electrochemical cycle stability

Inactive Publication Date: 2015-08-19
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing a silicon oxide composite negative electrode material for lithium ion batteries, to solve the problem of uniform dispersion of nano-silicon and buffer materials, and to achieve high cycle performance stability of silicon-based negative electrode materials

Method used

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  • Lithium ion battery silicon oxide composite negative electrode material and preparation method thereof
  • Lithium ion battery silicon oxide composite negative electrode material and preparation method thereof
  • Lithium ion battery silicon oxide composite negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 13.2g of SiO (350 mesh), 3.6g of glucose and 10.62g of AGP-8, according to the principle of ball mill material ratio, the ratio of material ratio is greater than 2:1, under the condition of planetary ball mill, 950 rpm , ball milled for 4 hours to obtain a mixed precursor.

[0033] Put the above-mentioned mixed precursor into a ceramic crucible, put the covered ceramic crucible into a high-temperature tube furnace; evacuate and pass argon; keep warm at 750° C. for 2 hours to obtain a composite negative electrode material.

[0034] The above composite negative electrode material was mechanically ground and sieved through a 325-mesh steel sieve to obtain a powdered silicon oxide composite negative electrode material 750A with a D50 particle size of 5.7 μm.

[0035] Take the above synthetic material with a mass ratio of 70wt% as the active material, 15wt% of Super P as the conductive agent, 15wt% of PVDF (polyvinylidene fluoride) (PVDF is a prepared 0.6wt% PVDF / NMP s...

Embodiment 2

[0037] Weigh 13.2g of SiO (350 mesh), 3.6g of glucose and 10.62g of AGP-8, according to the principle of ball mill material ratio, the ratio of material ratio is greater than 2:1, under the condition of planetary ball mill, 950 rpm , ball milled for 4 hours to obtain a mixed precursor.

[0038] The above mixed precursor was put into a ceramic crucible, and the covered ceramic crucible was put into a high-temperature tube furnace; vacuumed and argon flowed; kept at 950° C. for 2 hours to obtain a composite negative electrode material.

[0039] The above composite negative electrode material was mechanically ground and sieved through a 325-mesh steel sieve to obtain a powdered silicon oxide composite negative electrode material 950A with a D50 particle size of 5.7 μm.

Embodiment 3

[0041] Weigh 13.2g of SiO (350 mesh), 3.6g of glucose and 10.62g of AGP-8, according to the principle of ball mill material ratio, the ratio of material ratio is greater than 2:1, under the condition of planetary ball mill, 950 rpm , ball milled for 4 hours to obtain a mixed precursor.

[0042] The above mixed precursor was put into a ceramic crucible, and the covered ceramic crucible was put into a high-temperature tube furnace; vacuumed and argon flowed; kept at 1250° C. for 2 hours to obtain a composite negative electrode material.

[0043] The above composite negative electrode material was mechanically ground and sieved through a 325-mesh steel sieve to obtain a powdered silicon oxide composite negative electrode material 1250A with a D50 particle size of 5.7 μm. figure 1 The SEM of the composite material shows that the particle size of the material obtained by high temperature reaction is relatively uniform, and a small amount of silicon particles are distributed on the ...

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Abstract

The invention discloses a preparation method of a lithium ion battery silicon oxide composite negative electrode material, the method includes the following steps: (1) weighting a certain amount of silicon oxide SiOx, organic carbon and a graphite oxide precursor raw material for ball milling for 0.5-24 h to fully mix the precursor raw material; and (2) calcining the mixed precursor raw material in a protective atmosphere at 600-1400 DEG C for 0.5-12 h, and performing post-processing to obtain the silicon oxide composite negative electrode material. Through silicon oxide disproportionation, silica nanoparticles are distributed evenly in silicon dioxide, by organic carbon splitting decomposition, carbon coating is obtained, the probability of the formation of a SEI (solid electrolyte interphase) film in the material charge and discharge process can be reduced, the material electrochemical cycle stability can be improved, and by addition of graphite, good conductivity and ratio stability performance can be provided for the material. The production process is simple, raw material is cheap and easy to obtain, equipment is general, and mass production is easy.

Description

technical field [0001] The invention relates to a preparation method of a silicon oxide composite negative electrode material for a lithium ion battery. Background technique [0002] Due to its performance advantages, lithium-ion batteries have been used in fields requiring mobile power such as laptops, mobile phones, and cameras. With the development of lithium-ion batteries, lithium-ion batteries with high specific energy, long life and low cost that can be applied to the field of electric vehicles will become the focus of research. At present, cathode materials such as lithium manganese oxide (LiMn 2 o 4 ), lithium cobalt oxide (LiCoO 2 ), lithium iron phosphate (LiFePO 4 ) and ternary materials have laid the foundation for this type of battery. However, the specific capacity of commercial negative electrode material carbon is close to the theoretical value of 372mAh / g, and it is difficult to increase it. In order to improve the specific energy of the battery, findin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38
CPCY02E60/10
Inventor 卢世刚王建涛王耀黄斌杨娟玉谭翱
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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