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Preparation method of silicon-based negative electrode active material, silicon-based negative electrode active material, lithium ion battery negative electrode material and lithium ion battery

A technology of active materials and silicon-based negative electrodes, which is applied in the preparation of silicon-based negative electrode active materials, silicon-based negative electrode active materials, and lithium-ion battery negative electrode materials. It can solve the problems that it is difficult to obtain silicon-based negative electrode active materials with greatly improved performance. , to avoid pulverization and electrode collapse, buffer volume change, improve electrical conductivity and mechanical toughness

Inactive Publication Date: 2018-09-28
桑德新能源技术开发有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] One of the purposes of the present invention is to provide a method for preparing a silicon-based negative electrode active material, so as to improve the silicon-based negative electrode with greatly improved performance that is difficult to obtain through single silicon nanometerization or carbon coating and preparation of porous structures. Technical issues with active materials

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  • Preparation method of silicon-based negative electrode active material, silicon-based negative electrode active material, lithium ion battery negative electrode material and lithium ion battery
  • Preparation method of silicon-based negative electrode active material, silicon-based negative electrode active material, lithium ion battery negative electrode material and lithium ion battery
  • Preparation method of silicon-based negative electrode active material, silicon-based negative electrode active material, lithium ion battery negative electrode material and lithium ion battery

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preparation example Construction

[0038] According to one aspect of the present invention, the present invention provides a preparation method of a silicon-based negative electrode active material, and the preparation method of the silicon-based negative electrode active material provided by the present invention includes the following steps:

[0039] (a) Coating SiO containing polymer protective agent on nano-silica powder 2 , to obtain a Si / SiO with nano-silicon as the core and silicon dioxide as the shell 2 composite material;

[0040] (b) in Si / SiO 2 Graphene oxide is coated on the composite material, and the graphene oxide is used as the shell layer, and the Si / SiO is coated 2 Composite Si / SiO 2 / GO composite material, where GO is the abbreviation of graphene oxide;

[0041] (c) Si / SiO 2 / GO composites were calcined to obtain Si / SiO 2 / Graphene composite material, Graphene is graphene, which is the product obtained after calcination of graphene oxide;

[0042] (d) Etching Si / SiO with strong acid so...

Embodiment 1

[0094] The present embodiment provides a method for preparing a silicon-based negative electrode active material, comprising the following steps:

[0095] (1) 10g nano-silicon powder (particle size ranging from 100-200nm) is stirred and dispersed into a mixed solution of ethanol and water to obtain a nano-silicon dispersion liquid, wherein in the mixed solution of ethanol and water, the volume ratio of ethanol and water is 1:1.

[0096] (2) Add 2g of PVP and 80mL of ammonia water to the nano-silicon dispersion, after mixing evenly, add 200ml of TEOS dropwise, then stir at room temperature for 1h, centrifuge, and dry to obtain Si with nano-silicon as the core and silica as the shell. / SiO 2 composite powder;

[0097] (3) Disperse 3 g of GO in ethanol with a concentration of 75% to obtain a GO dispersion;

[0098] (4) 97g Si / SiO 2 The composite powder was added to the GO dispersion, stirred for 12 h, and then spray-dried to obtain graphene oxide as the shell layer and coated...

Embodiment 2

[0102] This embodiment provides a method for preparing a silicon-based negative electrode active material. The difference between this embodiment and Embodiment 1 is that in step (b), the mass of PVP is 6 g and the TEOS is 120 mL.

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Abstract

The invention provides a preparation method of a silicon-based negative electrode active material, the silicon-based negative electrode active material, a lithium ion battery negative electrode material and a lithium ion battery, and relates to the technical field of lithium ion batteries. The preparation method comprises the steps of adding a macromolecule protection agent during the process of coating a silicon dioxide layer outside nanometer silicon, coating a grapheme oxide layer outside the silicon dioxide layer, add finally, performing hydrofluoric acid etching to obtain a Si / void / SiO2 / void / Graphene composite material which takes the nanometer silicon as a core and which the silicon dioxide layer and the graphene layer are sequentially coated from inside to outside, and the technicalproblem that the silicon-based negative electrode active material with greatly-improved performance is difficult to obtain by traditional methods of single silicon nanocrystallization or carbon coating and porous structure preparation is reduced; and with the silicon-based negative electrode active material prepared by the method provided by the invention, the volume change of the nanometer coreduring the charge-discharge process can be reduced, and moreover, the conductivity and the dynamic flexibility of the silicon-based negative electrode active material can be improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a silicon-based negative electrode active material, a silicon-based negative electrode active material, a lithium ion battery negative electrode material and a lithium ion battery. Background technique [0002] At present, lithium-ion batteries have been widely used in portable electronic devices, electric vehicles and many other fields. However, with the development of science and technology, the existing lithium-ion batteries can no longer meet the growing demand. Therefore, the development of lithium-ion batteries with high energy density is a inevitable development trend. [0003] Silicon has a high theoretical specific capacity and a moderate voltage plateau, making it an ideal anode material for high-energy-density Li-ion batteries. However, the huge volume expansion of silicon during the lithium intercalation process easily causes the...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M10/0525C01B32/198
CPCC01B32/198H01M4/366H01M4/386H01M4/48H01M10/0525Y02E60/10
Inventor 徐艳红苗力孝
Owner 桑德新能源技术开发有限公司
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