Process for producing silicon-based carbon composite material for lithium ion battery cathode

A silicon-based composite material, lithium-ion battery technology, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of small theoretical processing capacity of graphite, high production cost of nano-silicon and thin-film silicon, material pulverization, etc.

Inactive Publication Date: 2012-08-01
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
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  • Application Information

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Problems solved by technology

At present, the negative electrode materials of commercial lithium-ion batteries are mainly graphite materials. Graphite has a layered structure, and its volume expansion is small during charging and discharging, and it is not easy to pulverize the material. However, the theoretical processing capacity of graphite is small, only 400mAh/g
Silicon has attracted w

Method used

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  • Process for producing silicon-based carbon composite material for lithium ion battery cathode
  • Process for producing silicon-based carbon composite material for lithium ion battery cathode
  • Process for producing silicon-based carbon composite material for lithium ion battery cathode

Examples

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Embodiment 1

[0015] A kind of preparation method of lithium-ion battery negative pole silicon-based composite material, take Si powder as main material, take graphite powder as auxiliary material, the particle size of Si powder and graphite powder is all less than 20 μ m, Si powder and graphite powder are 95 by mass ratio: 5 After mixing, put it into a steel ball mill jar, vacuumize the steel ball mill jar and replace it with argon gas for three times, then fill it with argon as a protective gas, put the ball mill jar filled with protective gas in a planetary ball mill, and grind The diameter of the ball is 15-5mm, and the ball is milled at a speed of 500 rpm for 80 hours to obtain a powder with a particle size of less than 20 μm, which is the silicon-based composite material for the negative electrode of the lithium-ion battery. The particle size distribution is as follows: figure 1 shown.

[0016] figure 2 It is the X-ray diffraction figure of embodiment 1. It can be seen from the fig...

Embodiment 2

[0018] A kind of preparation method of lithium-ion battery negative electrode silicon-based composite material, take Si powder as main material, take flocculent carbon black as auxiliary material, the particle size of Si powder and flocculent carbon black is all less than 20 μ m, Si powder and flocculent carbon black Mixed according to the mass ratio of 95:5 and put into the steel ball milling jar, vacuumize the steel ball milling jar and replace it with argon gas for three times, then fill it with argon as a protective gas, and place the ball milling jar filled with protective gas In the planetary ball mill, the diameter of the ball is 15-5mm, and the ball is milled at a speed of 500 rpm for 80 hours, and the powder with a particle size of less than 20 μm is the silicon-based composite material for the negative electrode of the lithium-ion battery. The particle size distribution is as follows: figure 1 shown.

[0019] figure 2 It is the X-ray diffraction figure of embodimen...

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Abstract

Disclosed is a process for producing a silicon-based composite material for a lithium ion battery cathode. The process comprises that silicon powder serves as a main material, graphite powder or flocculent carbon black serves as an auxiliary material, the main material and the auxiliary material are mixed and placed in a ball-grinding steel tank, argon serves as a shielding gas, the ball-grinding steel tank inflated with the shielding gas is placed in a planetary ball mill, and powder with granularity of less than 20 mum, which is the silicon-based composite material for the lithium ion battery cathode, is obtained after the mixture is subjected to ball milling at 500 revolutions/minute for 80 hours. The process has the advantages that the silicon material having the good lithium-storing capacity is mixed with the carbon material having the good electrical conductivity, atomic-grade mixing of the silicon material and the carbon material is achieved in a mechanical alloying mode, the electrical conductively of the silicon matrix is fully improved, and the inert carbon material can reduce volume expansion caused by the processes of lithium intercalation and lithium deintercalation of the silicon material in the processes of charging and discharging of the inert carbon material, so that the cycle performance of the silicon material is improved, the electrical conductivity and the cycle performance of the carbon-doped material are better than those of the pure silicon material.

Description

technical field [0001] The invention relates to a preparation technology of lithium-ion battery negative electrode materials, in particular to a preparation method of a lithium-ion battery negative electrode silicon-based carbon composite material. Background technique [0002] Lithium-ion batteries are a new generation of secondary batteries after lead-acid batteries, nickel-cadmium batteries and nickel-metal hydride batteries. Today, when the world is facing continuous shortage of oil resources and deteriorating environment, lithium-ion batteries have become a high-tech development due to their advantages such as high capacity, long cycle life, small self-discharge, no memory effect, no environmental pollution and good safety performance. One of the key points, it is considered to be an ideal choice for high-capacity, high-power batteries, and is an environmentally friendly power source in the 21st century. Since the commercialization of rechargeable lithium-ion batteries...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62H01M4/04H01M4/1395
CPCY02E60/122Y02E60/10
Inventor 姜训勇张磊
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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