SiOx material surface coating treatment method and device

A surface coating and slurry technology, applied in the field of lithium-ion batteries, can solve the problems of insignificant improvement in benefits, uneven coating, and difficulty in meeting mass production needs, so as to eliminate the problem of material transportation pollution and isolate the impact of the external environment. , the effect of reducing the expansion effect

Active Publication Date: 2021-06-18
新疆硅基新材料创新中心有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, there are at least the following disadvantages in adopting the above-mentioned process: (1) Whether it is a gas phase method or a liquid phase method, a separate coating and granulation process is adopted, and the coating is not uniform. x The silicon anode material that material makes is not obvious to the promotion benefit of lithium-ion battery; (2) in the liquid phase method, carbon source must be soluble in organic solvent, thereby limit the scope of use of carbon source and organic solvent; (3) both It is not conducive to continuous production, and it is difficult to meet the needs of mass production

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  • SiOx material surface coating treatment method and device

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Embodiment 1

[0045] This embodiment provides a SiO x Methods of surface coating treatment of materials, including,

[0046] S1 pulping: take SiO x , Additive A, organic solvent, mix, and then perform high-speed dispersion treatment to obtain SiO x The slurry of the required particle size distribution of the particle surface coating additive A; the slurry of the required particle size distribution in this embodiment refers to SiO x The particle size is 0.2-15 μm.

[0047] S2 granulation: Atomize the slurry, heat, evaporate, and separate to obtain a granule product with the surface-coated additive A.

[0048] like figure 1 As shown, this embodiment discloses a SiO x Equipment for material surface coating treatment, including:

[0049] Slurry tank 1, for SiO x , additive A, and an organic solvent are mixed to obtain a slurry;

[0050] The high-speed dispersion device 2 is connected with the slurry tank 1, and is used for high-speed dispersion treatment of the slurry output from the slur...

Embodiment 2

[0055] like figure 1 As shown, this embodiment provides a SiO x Equipment for material surface coating treatment, including:

[0056] Slurry tank 1, for SiO x , additive A, and an organic solvent are mixed to obtain a slurry;

[0057] The high-speed dispersion device 2 is connected with the slurry tank 1, and is used for high-speed dispersion treatment of the slurry output from the slurry tank 1;

[0058] The spray drying equipment is connected with the high-speed dispersion equipment 2, and is used to spray and dry the slurry after the high-speed dispersion treatment, so as to vaporize the organic solvent in the slurry, and obtain SiO with the surface coating additive A x particles;

[0059] Cyclone separator 3, communicated with the spray drying equipment, used to separate the SiO of organic solvent gas and surface coating additive A x particles.

[0060] Further, it also includes a circulation pipeline 4, and the two ends of the circulation pipeline 4 communicate with...

Embodiment 3

[0080] The present embodiment provides a kind of SiO that adopts the device in embodiment 2 x The method of material surface coating treatment, including:

[0081] S1 pulping, take SiO x , Additive A, organic solvent, mix, and then perform high-speed dispersion treatment to obtain SiO x A slurry of the required particle size distribution of the additive A coated on the surface of the particles.

[0082] Among them, SiO x The particle size is preferably 100nm-100μm. Additive A is a long carbon chain polymer organic substance, such as monosaccharide (such as galactose, fructose, etc.), disaccharide (such as maltose, lactose, etc.), polysaccharide (such as starch, fiber One or more in element etc.); Organic solvent is alcohols, as can be one or more in ethanol, isopropanol, butanol; SiO x , Additive A, organic solvent in a weight ratio of 20:1:(50-100).

[0083] In this embodiment, the pulping process in step S1 further includes: performing a high-speed dispersion cycle on t...

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Abstract

The invention discloses a SiOx material surface coating treatment method which comprises the following steps: S1, pulping: taking SiOx, an additive A and an organic solvent, mixing, and then carrying out high-speed dispersion treatment to prepare slurry with required particle size distribution of SiOx particle surfaces coated with the additive A; and S2, granulating: atomizing the slurry, heating, evaporating and separating to obtain a SiOx particle product of which the surface is coated with the additive A. The invention also discloses a device for coating the surface of the SiOx material, which is used for the method for coating the surface of the SiOx material. According to the method, the surfaces of the SiOx particles can be uniformly coated.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a SiO x A method and device for material surface coating treatment. Background technique [0002] In lithium-ion batteries, the theoretical capacity of traditional graphite-based anode materials is only 372mAh / g, while that of silicon anode materials is 3590mAh / g, which is an ideal anode material for lithium-ion batteries. However, in the state of fully intercalating lithium, the volume expansion of the silicon negative electrode material can reach 300%, causing the structure of the silicon negative electrode material to collapse and pulverize, resulting in poor cycle performance, which seriously affects the life and safety of lithium-ion batteries. The main methods to solve the volume expansion of silicon negative electrode materials are: nanometerization and compounding of silicon materials, that is, compounding with metals or non-metals, such as silicon-carbon c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/485H01M10/0525H01M10/058
CPCH01M4/485H01M10/0525H01M4/1391H01M10/058H01M2004/027Y02P70/50Y02E60/10
Inventor 赵志宇范协诚袁芳伟李硕石佳光刘朗胡保平
Owner 新疆硅基新材料创新中心有限公司
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