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Silicon-based negative electrode material for lithium ion batteries, and preparation method and application thereof

A technology for silicon-based negative electrode materials and lithium-ion batteries, which can be used in electrode manufacturing, battery electrodes, and secondary batteries. Excellent, prolonging the service life and enhancing the stability

Active Publication Date: 2019-12-13
DONGGUAN CHUANGMING BATTERY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a silicon-based negative electrode material for lithium-ion batteries, which aims to solve the problems of the existing silicon negative electrode materials, such as easy cracking of negative electrode particles, easy occurrence of powder drop, negative electrode de-foiling, and cycle diving caused by volume expansion. question

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  • Silicon-based negative electrode material for lithium ion batteries, and preparation method and application thereof
  • Silicon-based negative electrode material for lithium ion batteries, and preparation method and application thereof
  • Silicon-based negative electrode material for lithium ion batteries, and preparation method and application thereof

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preparation example Construction

[0073] The embodiment of the present invention also provides a method for preparing a silicon-based negative electrode slurry for a lithium ion battery, comprising the following steps:

[0074] S10. Obtain a silicon-based functional material and a carbon nanotube conductive agent, and pre-mix the silicon-based functional material and the carbon nanotube conductive agent to obtain a silicon-based functional material coated with carbon nanotubes;

[0075] S20. Obtain a carbon black conductive agent and a thickener. After mixing the carbon black conductive agent and the thickener for the first time, add water to adjust the solid content to 60% to 75%, and perform the second mixing process. Mixing treatment to obtain the second mixed product;

[0076] S30. adding the silicon-based functional material whose surface is coated with carbon nanotubes to the second mixed product, and performing a third mixed treatment to obtain a third mixed product;

[0077] S40. Adding water to adjus...

Embodiment 1

[0099] A silicon-based negative electrode slurry with a carbon nanotube content of 0.1%, the preparation method of which comprises the steps of:

[0100] ① Obtain 302.86g of silicon anode material and 5.51g of carbon nanotube conductive agent, and pre-mix the silicon anode material and carbon nanotube conductive agent at a revolution speed of 15rpm and a rotation speed of 100rpm for 10 minutes to obtain a surface coating Silicon anode materials with carbon nanotubes;

[0101] ② Obtain 5000g of graphene negative electrode material, 27.53g of carbon black conductive agent and 71.59g of thickener, and mix graphene negative electrode material, carbon black conductive agent and thickener at a revolution speed of 15rpm and a rotation speed of 100rpm. After 10 minutes of treatment, add water to adjust the solid content to 60% to 75%, and then mix for 15 minutes at a revolution speed of 15 rpm and a rotation speed of 5 rpm to obtain a second mixed product;

[0102] ③ Add the silicon ...

Embodiment 2

[0106] A silicon-based negative electrode slurry with a carbon nanotube content of 1%, the preparation method of which comprises the steps of:

[0107] ① Obtain 303.20g of silicon anode material and 55.13g of carbon nanotube conductive agent, and pre-mix the silicon anode material and carbon nanotube conductive agent at a revolution speed of 15rpm and a rotation speed of 100rpm for 10 minutes to obtain a surface coating Silicon anode materials with carbon nanotubes;

[0108] ② Obtain 5000g of graphene negative electrode material, 27.56g of carbon black conductive agent and 60.64g of thickener, and mix graphene negative electrode material, carbon black conductive agent and thickener at a revolution speed of 15rpm and a rotation speed of 100rpm. After 10 minutes of treatment, add water to adjust the solid content to 60% to 75%, and then mix for 15 minutes at a revolution speed of 15 rpm and a rotation speed of 5 rpm to obtain a second mixed product;

[0109] ③ Add the silicon a...

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Abstract

The invention belongs to the technical field of batteries and particularly relates to a silicon-based negative electrode material for lithium ion batteries. Based on the total mass of the silicon-based negative electrode material being 100%, the silicon-based negative electrode material includes the following components in mass percentages: 90% to 99.3% of silicon-based functional material, 0% to5% of carbon black conductive agent, 0.1% to 5% of carbon nanotube conductive agent, 0.5 to 5% of binder, and 0.1% to 2% of thickener, with the balance of water, wherein the carbon nanotube conductiveagent coats the surface of the silicon-based functional material. A grid-shaped winding structure formed on the surface of the carbon nanotube silicon-based functional material having a chain structure in the silicon-based negative electrode material for lithium ion batteries can have a good electrically conductive effect, effectively enhances the conductivity of the silicon-based negative electrode material, can suppress the volume change and expansion of the silicon-based functional material during the intercalation / delithiation process, prolongs a battery life, and improves the safety performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a silicon-based negative electrode material for a lithium ion battery, a preparation method for a silicon-based negative electrode slurry for a lithium ion battery, a negative electrode sheet for a lithium ion battery and a lithium ion battery. Background technique [0002] Lithium-ion battery has many advantages such as high voltage, high energy density, long cycle life, small self-discharge, no memory effect, wide operating temperature range, and environmental friendliness. It is recognized as an ideal chemical energy source in today's society and is commonly used in modern life. Energy storage and conversion devices are widely used in portable electronic devices such as mobile phones and laptop computers, large-scale energy storage power stations and electric vehicles. At present, graphite-based carbon anode materials are mainly used as anode materials for lithiu...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/587H01M4/62H01M4/04H01M4/1395H01M4/139H01M4/1393H01M10/0525
CPCH01M4/04H01M4/139H01M4/1393H01M4/1395H01M4/362H01M4/366H01M4/386H01M4/483H01M4/587H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 李红娜袁庆华赵悠曼
Owner DONGGUAN CHUANGMING BATTERY TECH
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