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Silicon nano wire-fullerene complex cathode material for lithium ion battery and preparation method thereof

A technology of lithium-ion batteries and silicon nanowires, applied in electrode manufacturing, battery electrodes, electrolytic inorganic material coatings, etc., can solve the problems of lower specific capacity of composite materials, no lithium storage capacity, etc., and achieve excellent cycle stability and charge-discharge High performance, high adjustability, simple and economical method

Inactive Publication Date: 2011-10-05
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wen Zhongsheng et al. [Wen Zhongsheng, etc. Patent application number: 201010223672.0] filled silicon and gold particles in silicon nanowires. The excellent conductivity of gold improved the electrical contact performance of silicon nanowires, but gold The particles themselves have no lithium storage capacity, which reduces the specific capacity of the composite material

Method used

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  • Silicon nano wire-fullerene complex cathode material for lithium ion battery and preparation method thereof
  • Silicon nano wire-fullerene complex cathode material for lithium ion battery and preparation method thereof
  • Silicon nano wire-fullerene complex cathode material for lithium ion battery and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0022] Clean the silicon wafer; soak the p-type [100] direction monocrystalline silicon wafer with a resistivity of 3-7Ω*cm in 30% H with a volume ratio of 1:3 2 o 2 : Concentrated H 2 SO 4 solution, the soaking time is about 20 minutes; then soak in 5% hydrofluoric acid solution for about 5 minutes; coat a layer of plastic glue on the unpolished surface of the silicon wafer, and then deposit a layer of plastic glue on the silicon wafer by electroless deposition method. Layer of nano-silver particle film, the electroplating solution is 4.8M HF and 0.005M AgNO 3 Mix the solution for 1.5min; wash the silver-plated silicon chip with deionized water, and place it in 4.8M HF and 0.4M H 2 o 2 In the mixed solution, react at a constant temperature of 50°C for 60 minutes; put the corroded silicon chip into the acetone solution until the plastic glue on the back of the silicon chip falls off; finally use HNO 3 solution, HF solution and deionized water are washed and dried to obtai...

Embodiment 2

[0025] Clean the silicon wafer; soak the n-type [100] direction monocrystalline silicon wafer with a resistivity of 3-7Ω*cm in 30% H with a volume ratio of 1:3 2 o 2 : Concentrated H 2 SO 4 solution, the soaking time is about 20 minutes; then soak in 5% hydrofluoric acid solution for about 5 minutes; coat a layer of plastic glue on the unpolished surface of the silicon wafer, and then deposit a layer of plastic glue on the silicon wafer by electroless deposition method. Layer of nano-silver particle film, the electroplating solution is 4.8M HF and 0.005M AgNO 3 Mix the solution for 1.5min; wash the silver-plated silicon chip with deionized water, and place it in 4.8M HF and 0.4M H 2 o 2 In the mixed solution, react at a constant temperature of 50°C for 60 minutes; put the corroded silicon chip into the acetone solution until the plastic glue on the back of the silicon chip falls off; finally use HNO 3 solution, HF solution and deionized water are washed and dried to obtai...

Embodiment 3

[0028] Clean the silicon wafer; soak the p-type [100] direction monocrystalline silicon wafer with a resistivity of 0.01-0.2Ω*cm in 30% H with a volume ratio of 1:3 2 o 2 : Concentrated H 2 SO 4 solution, the soaking time is about 20 minutes; then soak in 5% hydrofluoric acid solution for about 5 minutes; coat a layer of plastic glue on the unpolished surface of the silicon wafer, and then deposit a layer of plastic glue on the silicon wafer by electroless deposition method. Layer of nano-silver particle film, the electroplating solution is 4.8M HF and 0.005M AgNO 3 Mix the solution for 1.5min; wash the silver-plated silicon chip with deionized water, and place it in 4.8M HF and 0.4M H 2 o 2 In the mixed solution, react at a constant temperature of 50°C for 60 minutes; put the corroded silicon chip into the acetone solution until the plastic glue on the back of the silicon chip falls off; finally use HNO 3 solution, HF solution and deionized water are washed and dried to ...

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Abstract

The invention discloses a silicon nano wire-fullerene complex cathode material for a lithium ion battery and a preparation method thereof. Fullerene flexible conductive particles and silicon nano wires form a binary complex together; and the silicon nano wires are used as a main body for storing lithium, and the fullerene flexible conductive particles are supported on the surfaces of the silicon nano wires to form a topological netlike structure consisting of silicon nano wire arrays and fullerene. According to the topological netlike structure characteristics of the silicon nano wire-fullerene complex cathode material for the lithium ion battery, in the complex structure, the flexible conductive fullerene supported granules have double functions, wherein on one hand, volume expansion of silicon in the lithium embedding process can be buffered by a large amount of gaps among the fullerene and excellent elasticity of the fullerene so as to block the fusion of the adjacent silicon nano wires; and on the other hand, the fullerene can be used as a connector of the silicon nano wires to realize multi-channel migration of lithium ions, so the complex cathode material has more excellent cyclical stability and charge / discharge performance compared with the traditional silicon cathode material.

Description

technical field [0001] The invention relates to a novel silicon nanowire-fullerene complex negative electrode material for lithium ion batteries and a preparation method thereof, belonging to the field of lithium ion batteries. Background technique [0002] Lithium-ion batteries have many advantages such as high working voltage, large specific capacity, long cycle life, good safety performance, no memory, no environmental pollution, small self-discharge and fast charging and discharging, and have become a technological and industrial focus of all countries in the world. . One of the key issues in the development of new lithium-ion batteries is whether to design and manufacture anode materials with excellent performance. Silicon material is considered to be one of the most promising anode materials for high-performance lithium batteries. Its highest theoretical capacity is 4200mAh / g, which is 10 times higher than that of traditional graphite electrodes, much larger than the ...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/1395H01M4/04C25D9/06
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 钟建新杨利文祁祥魏晓林
Owner XIANGTAN UNIV
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