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MXene silicon-carbon composite material, preparation method thereof, negative electrode and lithium ion battery

A technology of silicon-carbon composite materials and silicon-carbon, which is applied in nanotechnology for materials and surface science, negative electrodes, battery electrodes, etc., can solve the problems of amorphous carbon with large irreversible capacity, unstable structure, and poor processing performance

Active Publication Date: 2020-12-04
宁波富理电池材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nano-silicon mainly has a large specific surface, serious interface problems, and poor processability
Porosity can solve part of the expansion problem, but the structure is unstable, and the material will fail after being broken. At the same time, the porous silicon itself has a large specific surface area, and the interface problem is serious.
Oxide coating will lead to a decrease in conductivity and additional consumption of lithium and lead to lower efficiency for the first time
Carbon coating has the problem of carbon layer rupture caused by volume expansion during the cycle, and the irreversible capacity of amorphous carbon is large, resulting in a decrease in the first effect

Method used

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  • MXene silicon-carbon composite material, preparation method thereof, negative electrode and lithium ion battery
  • MXene silicon-carbon composite material, preparation method thereof, negative electrode and lithium ion battery
  • MXene silicon-carbon composite material, preparation method thereof, negative electrode and lithium ion battery

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preparation example Construction

[0035] The invention provides a kind of preparation method of MXene silicon-carbon composite material, comprises the following steps:

[0036] A) mixing the silicon-carbon precursor solution and the MXene slurry, and spray-drying the resulting mixed solution to obtain intermediate particles;

[0037] The silicon carbon precursor solution includes SiOx, nano-carbon source, additive and water, 0.6<x<1.4, and the additive is one of stearic acid, Tween, silane coupling agent, fatty acid sorbitan, fatty acid glyceride species or several;

[0038] Described MXene slurry comprises MXene, dispersion agent and solvent;

[0039] B) Calcining the intermediate particles at a high temperature under an inert atmosphere or a reducing atmosphere to obtain an MXene silicon-carbon composite material.

[0040] In the present invention, first, the silicon carbon precursor solution and the MXene slurry are prepared respectively.

[0041] The silicon carbon precursor solution is preferably prepa...

Embodiment 1

[0080] by SiO 0.95 : Nano carbon = 94:6 Weigh SiOx and polyvinylpyrrolidone, add 0.2% silane coupling agent, disperse in water, prepare a slurry with a solid content of 50%, and then carry out high-energy ball milling, the ratio of material to ball is 1:10, milling The ratio of the ball diameter is 0.5, 1, 5cm is 1:2:3, the ball milling speed is 450r / min, and the ball milling time is 1h.

[0081] MXene was added to water, and 2.5% polyvinylpyrrolidone and 2.5% hydroxymethylcellulose were added as dispersants for high-speed dispersion at a speed of 1200r / min, and finally an MXene solution with a solid content of 3% was prepared.

[0082] Mix A and B solutions evenly, add MXene to 5% of SiOx, add water to adjust the solid content to 20%, disperse at a speed of 300r / min for 2h, and then spray dry at a drying temperature of 220°C and an atomizer at a speed of 22000r / min min, drying speed 10L / h.

[0083] Then it was sintered at 800°C for 8h under argon atmosphere.

Embodiment 2

[0085] by SiO 0.95 : Nano carbon = 94:6 Weigh SiOx and polyvinylpyrrolidone, add 0.2% silane coupling agent, disperse in water, prepare a slurry with a solid content of 50%, and then carry out high-energy ball milling, the ratio of material to ball is 1:10, milling The ratio of the ball diameter is 0.5, 1, 5cm is 1:2:3, the ball milling speed is 450r / min, and the ball milling time is 1h.

[0086] MXene was added to water, and 2.5% polyvinylpyrrolidone and 2.5% hydroxymethylcellulose were added as dispersants for high-speed dispersion at a speed of 1200r / min, and finally an MXene solution with a solid content of 3% was prepared.

[0087] Mix A and B solutions evenly, add MXene to 10% of SiOx, add water to adjust the solid content to 15%, disperse at a speed of 300r / min for 2h, and then spray dry at a drying temperature of 220°C and an atomizer at a speed of 22000r / min min, drying speed 10L / h.

[0088] Then it was sintered at 800°C for 8h under argon atmosphere.

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Abstract

The invention provides an MXene silicon-carbon composite material. The MXene silicon-carbon composite material comprises a SiOx substrate material, nano carbon coating the surface of the SiOx substrate material and MXene coating the surface of the nano carbon, and 0.6<x<1.4. The MXene material is innovatively adopted as a coating layer to reconstruct a secondary structure, the stable mechanical strength and good conductivity of the MXene material are utilized to effectively inhibit the expansion of a silicon carbon material and enhance the conductivity of the silicon carbon material, and the good hydrophilicity of the MXene material enables the preparation process to be simpler and the compounding effect to be better. The invention further provides a preparation method of the MXene silicon-carbon composite material, and the preparation method provided by the invention can reduce MXene overlapping inactivation, is adjustable and controllable in particle size and pore structure characteristics, and can be more effectively matched with a battery negative electrode.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to an MXene silicon-carbon composite material, a preparation method thereof, a negative electrode and a lithium-ion battery. Background technique [0002] As the energy crisis becomes more and more prominent, people's demand for the environment is getting higher and higher. In addition to the application of lithium batteries in the conventional digital field, the application of lithium batteries in electric vehicles and energy storage has also attracted more and more attention. One of the most promising development directions. Graphite is currently the most widely used negative electrode material, and its actual capacity is close to the theoretical value (372mAh / g). The theoretical capacity of silicon material is 4200mAh / g, which has become the most potential new generation negative electrode material. However, a serious problem brought about by high capa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/48H01M4/587H01M4/131H01M4/133H01M10/0525B82Y30/00
CPCH01M4/362H01M4/483H01M4/587H01M4/628H01M4/625H01M4/131H01M4/133H01M10/0525B82Y30/00H01M2004/027Y02E60/10
Inventor 何畅雷季晶晶刘兆平
Owner 宁波富理电池材料科技有限公司
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