SiO<x>/C composite cathode material, method for preparing same and application of SiO<x>/C composite cathode material

A negative electrode material, silicon-carbon composite material technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of battery negative electrode or lithium-ion battery capacity attenuation, insufficient cycle performance, low first Coulomb, etc., to achieve Improved Coulombic efficiency and cycle performance, stable structure, and excellent electrical conductivity

Active Publication Date: 2016-06-08
王凤鸣
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  • Abstract
  • Description
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, to provide a SiO x / C composite negative electrode material and preparation method thereof, to solve existing SiO x / C composite anode materials have technical problems of low initial Coulomb and insufficient cycle performance
[0008] Another object of the present invention is to provide SiO of the present invention x / C composite anode material application to solve the problem due to existing SiO x / C composite negative electrode material is not high for the first time and the cycle performance is insufficient, which leads to the technical problems that the battery negative electrode or lithium-ion battery is prone to capacity fading and poor cycle performance.

Method used

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  • SiO&lt;x&gt;/C composite cathode material, method for preparing same and application of SiO&lt;x&gt;/C composite cathode material
  • SiO&lt;x&gt;/C composite cathode material, method for preparing same and application of SiO&lt;x&gt;/C composite cathode material
  • SiO&lt;x&gt;/C composite cathode material, method for preparing same and application of SiO&lt;x&gt;/C composite cathode material

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preparation example Construction

[0037] On the other hand, the embodiment of the present invention also provides the above-mentioned embodiment of the present invention SiO x The preparation method of / C composite negative electrode material. In one embodiment, combined with the figure 1 , the preparation method of the high magnetic permeability wave-absorbing sheet of the embodiment of the present invention comprises the following steps:

[0038] Step S01: On SiO x An amorphous conductive carbon layer 22 is deposited on the surface of the particles 21 to form an amorphous conductive carbon layer coated with SiO x Granular silicon-carbon composite material particles 2;

[0039] Step S02: Disperse the silicon-carbon composite material particles 2 in an organic solvent, add an organic solvent dissolved with one or at least two mixtures of asphalt, polymer materials or polymers, and carry out the mixing process. Spray drying treatment to obtain mixed powder;

[0040] Step S03: Carry out carbonization treatm...

Embodiment 1

[0062] This embodiment provides a SiO x / C composite negative electrode material and preparation method thereof.

[0063] It is prepared as follows:

[0064] S11. Select metal silicon powder with an average particle size of 4 μm and silicon dioxide powder with an average particle size of 20 nm as raw materials. The molar ratio of the selected metal silicon powder / silicon dioxide powder is 1:1, and put the two materials into water After fully stirring and mixing, put it in an oven at 120°C and dry it to make a cake-like material;

[0065] S12. Put the silicon and silicon dioxide mixed cake material into a sintering furnace with a low-pressure atmosphere and the temperature raised to 1400 ° C for 12 hours to obtain bulk SiO x (x=1) material;

[0066] S13. SiO to be obtained x Put the bulk materials into the planetary ball mill and grind them for 6 hours, and then put them into the jet mill for 4 hours to get nano-sized SiO x Material;

[0067] S14. the nano-SiO obtained in...

Embodiment 2

[0073] This embodiment provides a SiO x / C composite negative electrode material and preparation method thereof.

[0074] It is prepared as follows:

[0075] S21. Select metal silicon powder with an average particle size of 4 μm and silicon dioxide powder with an average particle size of 20 nm as raw materials. The molar ratio of the selected metal silicon powder / silicon dioxide powder is 1:3, and put the two materials into water After fully stirring and mixing, put it in an oven at 120°C and dry it to make a cake-like material;

[0076] S22. Put the silicon and silicon dioxide mixed cake material into a sintering furnace with a low-pressure atmosphere and the temperature raised to 1400 ° C for 12 hours to obtain bulk SiO x (x=1.5) material;

[0077] S23. SiO to be obtained x Put the bulk materials into the planetary ball mill and grind them for 6 hours, and then put them into the jet mill for 4 hours to get nano-sized SiO x Material;

[0078] S24. the nano-SiO obtained ...

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Abstract

The invention provides an SiO<x> / C composite cathode material, a method for preparing the same and application of the SiO<x> / C composite cathode material. The SiO<x> / C composite cathode material is of a core-shell structure. A shell layer of the SiO<x> / C composite cathode material is a carbon layer, a core of the SiO<x> / C composite cathode material comprises a plurality of silicon carbon composite material particles, the silicon carbon composite material particles include SiO<x> particles and amorphous conductive carbon layers, the amorphous conductive carbon layers cover the surfaces of the SiO<x> particles, and free spaces are reserved between the silicon carbon composite material particles. The SiO<x> / C composite cathode material, the method and the application have the advantages that the SiO<x> / C composite cathode material is excellent in conductivity, firm in structure and stable in capacity, the coulomb efficiency and the cycle performance can be greatly improved, technological conditions for the method are controllable, the SiO<x> / C composite cathode material prepared by the aid of the method is stable in performance and high in production efficiency, and the production cost can be reduced.

Description

technical field [0001] The invention belongs to the field of battery technology, in particular to a SiO x / C composite negative electrode material and its preparation method and containing said SiO x / C composite anode materials for battery anodes and lithium-ion batteries. Background technique [0002] In recent years, with the continuous development of electronic equipment such as notebook computers, portable mobile phones, electric vehicles, electric tools, and energy storage power stations, lithium-ion batteries have excellent charge-discharge cycles due to their high capacity and high energy density. Performance has been developed by leaps and bounds. Lithium-ion batteries have become the preferred power source for products in the 3C field, electric vehicle batteries, electric tool batteries, and energy storage batteries for energy storage power stations. However, with the development of society and the continuous innovation of science and technology, people have hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/48H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 李硕解晶莹黄海军韩广帅张全生茆胜
Owner 王凤鸣
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