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Lithium-ion battery silicon monoxide negative electrode material, preparation method and application thereof

A lithium-ion battery, silicon oxide technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as difficulty in meeting high-rate charge and discharge performance, general rate performance of silicon oxide negative electrode materials, and low conductivity. , to achieve the effect of shortening migration distance, good cycle performance and excellent performance

Active Publication Date: 2020-02-07
乳源东阳光新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the conductivity of amorphous carbon obtained by pyrolysis is lower than that of commercial conductive agents, the rate performance of silicon oxide negative electrode materials obtained by granulation is average, and it is difficult to meet the special requirements of power batteries for high rate charge and discharge performance.

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  • Lithium-ion battery silicon monoxide negative electrode material, preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] This embodiment provides a silicon oxide negative electrode material for a lithium ion battery, which is prepared by the following method.

[0065] (1) Fragmentation of silicon oxide:

[0066] 20 parts of silicon oxide (raw material particle size is 10 μm) and 0.5 parts of additive polyethylene glycol 1500 were mixed in absolute ethanol, and crushed to 300 nm by wet sanding process.

[0067] (2) Spray granulation of silicon oxide:

[0068] Add 1 part of conductive agent (SP: multi-walled carbon nanotubes = 1), 1 part of organic carbon source phenolic resin and an appropriate amount of solvent absolute ethanol to the crushed silicon oxide suspension to make a solid content of 25%. The spray slurry was sprayed and granulated on a closed-loop three-fluid spray dryer. The inlet temperature of the spray drying was 120°C, and the outlet temperature was 80°C to obtain spherical silicon oxide secondary particles with a particle size of 6.2 μm.

[0069] (3) Pyrolysis of silico...

Embodiment 2

[0075] This embodiment provides a silicon oxide negative electrode material for a lithium ion battery, which is prepared by the following method.

[0076] (1) Fragmentation of silicon oxide:

[0077] 20 parts of silicon oxide (raw material particle size is 5 μm) and 0.5 part of additive stearic acid were mixed in absolute ethanol, and crushed to 650 nm by wet planetary ball milling process.

[0078] (2) Spray granulation of silicon oxide:

[0079] Add 1 part of conductive agent (acetylene black: multi-walled carbon nanotubes = 1), 4 parts of organic carbon source sucrose and an appropriate amount of solvent deionized water to the broken silicon oxide suspension to make a solid content of 15%. The spray slurry was sprayed and granulated on a three-fluid spray dryer, wherein the inlet temperature of the spray drying was 160°C, and the outlet temperature was 90°C to obtain spherical silicon oxide secondary particles with a particle size of 4.9 μm.

[0080] (3) Pyrolysis of sili...

Embodiment 3

[0086] This embodiment provides a silicon oxide negative electrode material for a lithium ion battery, which is prepared by the following method.

[0087] (1) Fragmentation of silicon oxide:

[0088] Evenly mix 20 parts of silicon oxide (raw material particle size is 3 μm) and 2 parts of additive polyvinylpyrrolidone K30, and crush to 720 nm by dry planetary ball milling process.

[0089] (2) Spray granulation of silicon oxide:

[0090] In the solvent deionized water, add silicon oxide after crushing, 0.5 part of conductive agent (Ketjen black: thin-layer graphene=1), 8.5 parts of organic carbon source glucose, and make it into a spray slurry with a solid content of 20%. Spray granulation was carried out on a two-fluid spray dryer, wherein the inlet temperature of the spray drying was 180° C., and the outlet temperature was 102° C. to obtain spherical silicon oxide secondary particles with a particle size of 5.3 μm.

[0091] (3) Pyrolysis of silicon oxide:

[0092] Under ni...

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Abstract

The invention relates to a lithium-ion battery silicon monoxide negative electrode material, and a preparation method and application thereof. A method for improving rate performance and cycle performance of the lithium-ion battery silicon monoxide negative electrode material includes the following steps: S1: crushing silicon monoxide to silicon monoxide particles having a particle size of 100 to800 nm; S2: after mixing the silicon monoxide particles, a conductive agent, an organic carbon source, and a solvent to obtain a slurry, performing granulation to obtain spherical silicon monoxide secondary particles having a particle size of 4 to 8 [mu]m; S3: pyrolyzing the silicon monoxide secondary particles; and S4: performing secondary coating on pyrolyzed silicon monoxide secondary particlesto obtain the silicon monoxide negative electrode material. In the invention, pulverization, secondary granulation, pyrolysis, and secondary coating processing are performed on the silicon monoxide,on the basis of retaining original first-time coulombic efficiency to a large extent, thereby shortening a lithium-ion diffusion path, improving lithium-ion conductivity, limiting lithium-ion volume expansion, and having better rate performance and cycle performance.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a lithium-ion battery silicon oxide negative electrode material and a preparation method and application thereof. Background technique [0002] With the rapid development of electric vehicles, the energy density of lithium-ion batteries can no longer meet the current market needs, and it is urgent to develop positive and negative electrode materials with high energy density. At present, high-energy-density cathode materials are represented by high-nickel ternary materials, while silicon-based anode materials are the development trend. [0003] The theoretical specific capacity of pure silicon negative electrode is 4200mAh / g, more than 10 times that of graphite negative electrode (372mAh / g), and the potential platform (~0.4VvsLi / Li + ) is suitable and is considered to be one of the most potential negative electrode materials in the next generation of lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/131H01M4/485H01M10/0525
CPCH01M4/131H01M4/1391H01M4/485H01M10/0525H01M2004/027Y02E60/10
Inventor 谌庆春张军彭果戈周政何凤荣温益凡
Owner 乳源东阳光新能源材料有限公司
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