Silicon-based slurry and preparation method and application thereof

A technology of silicon-based materials and slurries, which is applied in the direction of active material electrodes, electrical components, electrochemical generators, etc., can solve problems such as the complexity of the preparation process, achieve the effects of reducing the overall expansion rate, ensuring strength, and improving cycle performance

Active Publication Date: 2019-08-20
深圳市沃伦特新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese invention patent with the publication number CN107742698A discloses a preparation method and application of an embedded silicon-carbon composite material. The silicon-carbon composite material is prepared by the asphalt coating method, which inhibits the volume expansion of silicon and realizes the multi-component compounding of silicon-carbon. , but this method requires processes such as pressurized stirring, sintering and carbonization under an inert atmosphere, and the preparation process is more complicated

Method used

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  • Silicon-based slurry and preparation method and application thereof

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Embodiment 1

[0030] A silicon-based slurry, comprising the following components by weight: 10 parts of silicon-based material silicon oxide SiO, non-silicon-based ceramic material Al 2 o 3 0.5 parts of aluminum oxide, 0.5 parts of multi-walled carbon nanotubes of carbon material, 8 parts of acrylic resin PAA as a curing agent, 0.1 part of polyvinylpyrrolidone PVP as a dispersant, 0.1 part of isopropanol as a defoaming agent, and 100 parts of solvent water.

[0031] The preparation method of silicon-based slurry in the present embodiment comprises the following steps:

[0032] (1) Add part of the solvent into the first container, then add the curing agent, defoamer, part of the dispersant and the ground carbon material powder therein, and disperse in the high-pressure homogenizer to obtain the first mixed solution;

[0033](2) Add the remaining solvent into the second container, then add silicon-based materials, non-silicon-based ceramic materials and remaining dispersant, and stir to obta...

Embodiment 2

[0040] A silicon-based slurry, comprising the following components by weight: silicon-based material lithium disilicate Li 2 Si 2 o 5 17 parts, non-silicon-based ceramic material Li 7 La 3 Zr 2 o 12 2 parts, 0.2 parts of carbon material single-walled carbon nanotubes, 10 parts of curing agent acrylic resin PAA, 2 parts of hydrogenated nitrile rubber, 0.2 parts of dispersant polyvinylpyrrolidone PVP, 0.1 part of defoaming agent acetone, 100 parts of solvent water.

[0041] The preparation method of silicon-based slurry in the present embodiment comprises the following steps:

[0042] (1) Add part of the solvent to the first container, then add the curing agent, defoamer, part of the dispersant and the ground carbon material powder therein, and ultrasonically disperse to obtain the first mixed liquid;

[0043] (2) Add the remaining solvent into the second container, then add the silicon-based material, non-silicon-based ceramic material and remaining dispersant, and stir...

Embodiment 3

[0050] A silicon-based slurry, comprising the following components by weight: 16 parts of silicon-based material silicon oxide SiO, lithium silicate Li 2 SiO 3 1 part, 1 part of silicon simple substance Si, 5 parts of non-silicon-based ceramic material LiTFSI, 1 part of carbon material nano-carbon black, 12 parts of curing agent polyacrylonitrile PAN, 3 parts of polyethylene oxide PEO, dispersant dodecylbenzenesulfonate 0.1 part of sodium bicarbonate, 0.1 part of acetone as an antifoaming agent, and 150 parts of N-methyl pyrrolidone as a solvent.

[0051] The preparation method of silicon-based slurry in the present embodiment comprises the following steps:

[0052] (1) Add part of the solvent into the first container, then add the curing agent, defoamer, part of the dispersant and the ground carbon material powder, and grind it with a sand mill at a speed of 20000r / min to obtain the first mixed liquid;

[0053] (2) Add remaining solvent to the second container, then add s...

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Abstract

The invention relates to the field of lithium ion batteries, in particular to silicon-based slurry and a preparation method and application thereof. Raw materials of the silicon-based slurry comprisea silicon-based material, a non-silicon-based ceramic material, a carbon material, a curing agent, a dispersing agent, a defoaming agent and a solvent, and the silicon-based slurry is obtained throughstirring, mixing, dispersing and filtering in batches. The carbon material and the silicon-based material are compounded, the capacity of the electrode material is improved through the silicon-basedmaterial, the volume expansion of the silicon material in the circulation process is inhibited to a certain extent by use of the carbon material, and meanwhile, the conductivity, the electron mobilityand the electrochemical stability of the silicon-based slurry are improved through the carbon material. The added ceramic-based material can play a role of a framework, so that the expansion of the silicon material is further inhibited, and the cycle performance is improved. The silicon-based slurry serves as a lithium ion battery negative electrode material, it is facilitated that the battery capacity and the high capacity retention rate cycle index can be improved, and the electrochemical performance is improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a silicon-based slurry and its preparation method and application. Background technique [0002] With the demand for high-capacity and high endurance of lithium-ion batteries in new energy vehicles, communications and portable devices, lithium-ion batteries have developed into a bottleneck period. As far as the negative electrode is concerned, the widely used negative electrode materials are various carbon materials based on graphite, and its theoretical capacity is only 372mAh / g, and in the actual application process, it is close to the theoretical capacity, and it is difficult to achieve higher capacity requirements. , so the research on negative electrode active materials with high specific capacity has become the general trend. The theoretical capacity of silicon materials is much higher than that of graphite-based carbon materials, which can reach 4200mAh / g, and the res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/485H01M4/622H01M4/625H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 田野
Owner 深圳市沃伦特新能源有限公司
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