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Preparation method of lithium ion battery silicon monoxide negative electrode material

A lithium-ion battery, silicon oxide technology, applied in battery electrodes, nanotechnology for materials and surface science, negative electrodes, etc. Effectiveness of Utilization, Improved Conductivity, and Improved Performance

Inactive Publication Date: 2021-04-30
杭州新川新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the deficiencies existing in the prior art, and its main purpose is to provide a method for improving the performance of a silicon oxide negative electrode material with excellent conductivity, which can not only effectively solve the problem that the capacity of the existing silicon oxide material cannot be fully utilized, but also can Effectively alleviate the volume expansion problem of materials

Method used

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  • Preparation method of lithium ion battery silicon monoxide negative electrode material
  • Preparation method of lithium ion battery silicon monoxide negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The micron SiOx with quality A is evenly added into the plasma high-temperature furnace to evaporate, and the nano-scale SiOx powder B is produced, and the dispersion liquid is collected. The D50 of the obtained nano-SiOx is 100 nm;

[0037] The quality of the above-mentioned nano-SiO dispersion liquid is mixed in the D graphene oxide absolute ethanol liquid containing C;

[0038] The above-mentioned homogeneous mixed solution is spray-dried to obtain a secondary structure of an interwoven network of graphene oxide and SiOx;

[0039] The composite material with secondary structure of E is mixed with pitch F evenly again, heated in a rotary furnace and inert gas is passed through during this process, and carbon source gas acetylene is passed through at a rate of G L / h to obtain a multi-level structure of siloxane Composite electrode material.

[0040] The above-mentioned silicon-oxygen composite electrode material is mixed with nano-conductive carbon Super P and binder ...

Embodiment 2

[0044] The micron SiOx with quality A is evenly added into the plasma high-temperature furnace to evaporate, and the nano-scale SiOx powder B is produced, and the dispersion liquid is collected. The D50 of the obtained nano-SiOx is 100 nm;

[0045] The quality of the above-mentioned nano-SiO dispersion liquid is mixed in the D graphene oxide absolute ethanol liquid containing C;

[0046]The above-mentioned homogeneous mixed solution is spray-dried to obtain a secondary structure of an interwoven network of graphene oxide and SiOx;

[0047] Mix the composite material with secondary structure of E with F sucrose evenly, heat in a rotary furnace and pass inert gas during this process and pass in carbon source gas methane at a rate of G L / h to obtain a multi-level structure of siloxy Composite electrode material.

[0048] The above-mentioned silicon-oxygen composite electrode material is mixed with nano-conductive carbon Super P and binder PVDF in a ratio of 8:1:1 in nitrogen met...

Embodiment 3

[0050] The micron SiOx with quality A is evenly added into the plasma high-temperature furnace to evaporate, and the nano-scale SiOx powder B is produced, and the dispersion liquid is collected. The D50 of the obtained nano-SiOx is 100 nm;

[0051] The quality of the above-mentioned nano-SiO dispersion liquid is mixed in the D graphene oxide absolute ethanol liquid containing C;

[0052] The above-mentioned homogeneous mixed solution is spray-dried to obtain a secondary structure of an interwoven network of graphene oxide and SiOx;

[0053] The composite material with secondary structure of E is mixed with polydopamine F again, heated in a rotary furnace and an inert gas is introduced into the carbon source gas acetylene at a rate of G L / h during this process to obtain a multi-level structure of silicon oxide based composite electrode materials.

[0054] The above-mentioned silicon-oxygen composite electrode material is mixed with nano-conductive carbon Super P and binder PVD...

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Abstract

The invention discloses a preparation method of a lithium ion battery silicon monoxide negative electrode material. The method comprises the following steps of 1) producing and preparing micron-sized SiOx to obtain nano-sized SiOx, and collecting the nano-sized SiOx in a dispersion liquid; 2) fully mixing the dispersion liquid with a dispersion liquid of graphene oxide, and carrying out spray drying to obtain an interlaced network secondary structure of graphene oxide and SiOx; and 3) uniformly mixing the composite material with the secondary structure with cane sugar, asphalt, polyaniline, polydopamine and other carbon sources again, heating in a rotary furnace, and introducing an inert gas and an extremely small amount of carbon source gas in the process to obtain the silica-based composite electrode material with the multistage structure. The performance of the negative electrode material obtained by the method can be adjusted as required, the customized space is large, the energy density is high, the electrochemical performance is stable, and the conductivity of the material is greatly improved. In the process, the few gas-phase carbon sources are used rarely, so that the production safety is greatly improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of lithium-ion power batteries, in particular to a method for preparing a silicon oxide negative electrode material for a lithium-ion battery. [0002] technical background [0003] With the improvement of the performance of portable electronic products, the energy consumption is also increasing. In addition, the rapid development of the electric vehicle industry in recent years has made people's demand for high-capacity energy storage devices more and more urgent. Existing battery materials are increasingly difficult to meet people's needs for improving battery performance, and there is an urgent need to develop new battery materials. [0004] At present, the cost of graphite anode materials used in the lithium-ion battery system only accounts for 5% of the cost of the whole battery, and there is still a large room for cost increase and performance improvement. Even if the cost of the negative electrode is doubled, t...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/483H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 谢上川陈子亮刘德昆
Owner 杭州新川新材料有限公司
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