A kind of negative electrode of lithium ion battery and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of large volume expansion and low conductivity of silicon negative electrodes, and achieve high production efficiency, reduce expansion, and improve ion conductivity. Effect

Active Publication Date: 2021-07-13
赣州市康达新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a lithium ion battery negative electrode and its preparation method to solve the problems of large volume expansion and low conductivity of the existing silicon negative electrode proposed in the background technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A negative electrode material for a lithium ion battery, comprising silicon and a frame material, silicon is distributed in the frame material in nanometer size, the frame material is formed by carbon nanotubes or carbon black or carbon aerogel or a combination thereof, silicon The average primary particle diameter of carbon nanotubes is 400nm, the average diameter of carbon nanotubes is 7nm, and the average length is 5μm. The average primary particle diameter of carbon black is 15nm, the DBP absorption value is 180ml / 100g, and the porosity of carbon airgel is 80%. The typical pore size is 40nm, the network colloid particle diameter is 3nm, and the specific surface area is 600m 2 / g.

[0018] The preparation method of above-mentioned lithium-ion battery negative electrode material, comprises the following steps:

[0019] Step 1: Mix the framework material with micron-sized silicon particles, mix carbon nanotubes (CNT), Li435 and silicon particles in a mass ratio of 2:1...

Embodiment 2

[0024] A negative electrode material for a lithium ion battery, comprising silicon and a frame material, silicon is distributed in the frame material in nanometer size, the frame material is formed by carbon nanotubes or carbon black or carbon aerogel or a combination thereof, silicon The average primary particle diameter of carbon nanotubes is 450nm, the average diameter of carbon nanotubes is 9nm, and the average length is 10μm. The pore size is 45nm, the network colloid particle diameter is 14nm, and the specific surface area is 800m 2 / g.

[0025] The preparation method of above-mentioned lithium-ion battery negative electrode material, comprises the steps:

[0026] Step 1, the framework material is mixed with micron-sized silicon particles, CNT, carbon airgel and silicon particles are mixed in a mass ratio of 1:1:1, mixed in dry powder form for 30 minutes (stirred at 15 rpm), and then added with a total solid mass of 1.5 Double NMP was stirred at 15 rpm, dispersed at 18...

Embodiment 3

[0031]A negative electrode material for a lithium ion battery, comprising silicon and a frame material, silicon is distributed in the frame material in nanometer size, the frame material is formed by carbon nanotubes or carbon black or carbon aerogel or a combination thereof, silicon The average primary particle diameter of carbon nanotube is 490nm, the average diameter of carbon nanotube is 11nm, the average length is 20μm, the average primary particle diameter of carbon black is 70nm, the DBP absorption value is 350ml / 100g, and the porosity of carbon airgel is 98%, typical The pore size is 49nm, the network colloid particle diameter is 20nm, and the specific surface area is 1100m 2 / g

[0032] The preparation method of above-mentioned lithium ion battery negative electrode material, comprises the steps:

[0033] Step 1, the framework material is mixed with micron-sized silicon particles, Li435, carbon airgel and silicon particles are mixed at a mass ratio of 1:1:1, mixed in...

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Abstract

The invention discloses a lithium ion battery negative electrode and a preparation method thereof, comprising silicon and a frame material, the silicon is distributed in the frame material in nanometer size, and the frame material is made of carbon nanotubes or carbon black or carbon aerogel or a combination of them. Aiming at the problems of large volume expansion and low conductivity of the existing silicon negative electrode, the present invention designs a carbon nanotube or carbon black or carbon aerogel or a combination of them as the frame, and silicon particles are evenly distributed in the frame in nanometer size. Silicon-containing composite negative electrode, this design improves the reactivity of the material and shortens the diffusion path of lithium ions. The introduced frame material reserves a space for the expansion of the silicon material, and at the same time improves the electronic and ion conductance between the material particles, and through the method of the present invention The synthesized silicon-containing composite negative electrode material has a reversible capacity higher than 800mAh / g and good cycle stability. The method is simple and efficient, and is suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of battery manufacturing, in particular to a negative electrode of a lithium ion battery and a preparation method thereof. Background technique [0002] In recent years, electric vehicles have gradually entered people's lives, but the "mileage anxiety" that followed has increasingly troubled people. The reason is that the energy density of lithium-ion batteries for vehicles needs to be improved, and the high specific capacity The development of negative electrode materials is an important aspect in improving the energy density of batteries. [0003] At present, the actual specific capacity of graphite anode materials is very close to its theoretical specific capacity (372mAh / g), and it is difficult to improve it. Among all the potential lithium-ion battery anodes, silicon is the most promising anode material. Compared with graphite, silicon has ultra-high specific capacity (the theoretical specific capacit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 钟盛文胡经纬
Owner 赣州市康达新能源材料有限公司
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