Nano silicon composite negative electrode material for lithium ion battery, preparation method and lithium ion battery

A negative electrode material and nano-silicon technology, applied in the field of lithium-ion batteries, can solve the problems of small pores, difficult to effectively carry nano-silicon materials, difficult to achieve uniform deposition of nano-silicon materials, etc. The effect of high first charge-discharge efficiency

Inactive Publication Date: 2015-04-29
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, common porous carbon materials (such as activated carbon) have small pores, and it is difficult to effectively support nano-silicon materials, and carbon nanotubes or graphene are easy to agglomerate, and it is difficult to achieve uniform deposition of nano-silicon materials on their surfaces.

Method used

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  • Nano silicon composite negative electrode material for lithium ion battery, preparation method and lithium ion battery
  • Nano silicon composite negative electrode material for lithium ion battery, preparation method and lithium ion battery
  • Nano silicon composite negative electrode material for lithium ion battery, preparation method and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Add 500g of natural spherical graphite powder with an average particle size of 16-19μm and a carbon content of 99.95% and 1L of water into the ball milling tank, stir evenly, add 4kg of zirconia balls with a diameter of 10mm, the ball milling speed is 480r / min, and the ball milling time is 5 -25h, suction filtration and drying to obtain a hollow graphite material with a particle size of 1.0 μm;

[0054] (2) Put 500g of hollow graphite in a rotary furnace, adjust the rotation speed to 0.5r / min, and heat up to 700°C at a heating rate of 5.0°C / min under the protection of a high-purity nitrogen flow rate of 1.0L / min. Switch the high-purity nitrogen to a mixture of high-purity hydrogen and SiHCl3, keep the flow rate at 10.0L / min, switch the gas to high-purity nitrogen after a constant temperature of 3.0h, and cool to room temperature naturally to obtain hollow graphite / nano-silicon composite materials, nano The average particle size of the silicon material is 80.0nm;

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Embodiment 2

[0061] (1) Add 500g of artificial graphite powder with an average particle size of 10-13 μm and 99.95% carbon content and 1L of water into the ball milling tank, stir evenly, add 3kg of zirconia balls with a diameter of 5mm, the ball milling speed is 800r / min, and the ball milling time is 25- 40h, suction filtration and drying to obtain a hollow graphite material with a particle size of 8.0 μm;

[0062] (2) Put 500g of hollow graphite in a rotary furnace, adjust the rotation speed to 2.0r / min, and heat up to 500°C at a heating rate of 3.0°C / min under the protection of a high-purity nitrogen flow rate of 1.0L / min. Switching from high-purity nitrogen to high-purity hydrogen and SiH 4 The mixed gas, the flow rate is maintained at 2.0L / min, and the gas is converted into high-purity nitrogen gas after a constant temperature of 0.5h, and naturally cooled to room temperature to obtain a hollow graphite / nano-silicon composite material, and the average particle size of the nano-silicon...

Embodiment 3

[0066] (1) Add 500g of natural spherical graphite powder with an average particle size of 16-19μm and a carbon content of 99.95% and 1L of water into the ball milling tank, stir evenly, add 4kg of zirconia balls with a diameter of 3mm, the ball milling speed is 800r / min, and the ball milling time is 40 -60h, suction filtration and drying to obtain a hollow graphite material with a particle size of 5.0 μm;

[0067] (2) Put 500g of hollow graphite in a tube furnace, at a heating rate of 5.0°C / min, under the protection of a high-purity nitrogen flow rate of 2.5L / min, after heating up to 1000.0°C, switch from high-purity nitrogen to high-purity Hydrogen and SiCl 4 The mixed gas, the flow rate is maintained at 10.0L / min, and the gas is converted into high-purity nitrogen after 8.0 hours of constant temperature, and naturally cooled to room temperature to obtain a hollow graphite / nano-silicon composite material. The average particle size of the nano-silicon material is 1000.0nm;

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Abstract

The invention discloses a nano silicon composite negative electrode material, which comprises graphite matrix and a nano silicon material which is evenly deposited in the graphite matrix, wherein the nano silicon composite negative electrode material is prepared by chemical vapor deposition of nano silicon particles in hollow graphite with a silicon source. The nano silicon composite negative electrode material disclosed by the invention has the characteristics of high specific capacity (greater than 1,000mAh / g), high initial charge-discharge efficiency (greater than 93%) and high conductivity. The preparation method disclosed by the invention is simple to operate, easy to control, low in production cost and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a nano-silicon composite negative electrode material for lithium-ion batteries, a preparation method and a lithium-ion battery. Background technique [0002] Lithium-ion batteries are ideal power sources for portable electronic devices, electric vehicles and energy storage systems. The development of new electrode materials with high specific energy, good safety and low cost is the core content of the research and development of lithium-ion batteries. The research on new negative electrode materials is of great importance The development of a new generation of lithium-ion batteries is of great significance. At present, the mature lithium-ion battery anode materials are mainly graphite materials, and its theoretical specific capacity is only 372mAh / g. The development potential is limited, and it cannot meet the demand for high energy density of lithium-io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/386H01M4/62C23C16/24C23C16/4417H01M4/0426H01M4/0471H01M4/13H01M4/139H01M4/364H01M4/366H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 任建国岳敏黄友元贺雪琴
Owner BTR NEW MATERIAL GRP CO LTD
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