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A double-layer coated core-shell negative electrode material for lithium ion battery and a preparation method thereof

A technology of lithium-ion batteries and negative electrode materials, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve the problems of high platform voltage and low specific capacity, and improve conductivity and volume Effects of reduced swelling and excellent long-cycle performance

Inactive Publication Date: 2019-01-01
MAANSHAN KEDA PURUI ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the theoretical specific capacity of lithium titanate material is only 175mAh / g, and the specific capacity in actual use is lower, and the platform voltage is high.

Method used

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  • A double-layer coated core-shell negative electrode material for lithium ion battery and a preparation method thereof
  • A double-layer coated core-shell negative electrode material for lithium ion battery and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation method of the double-layer coated core-shell negative electrode material for lithium ion battery described in this embodiment is specifically carried out according to the following steps:

[0024] (1) Take natural graphite particles with a median particle size of 6 μm and place them in the CVD furnace liner, feed nitrogen to remove the air in the CVD furnace until the oxygen content is ≤100ppm, and then raise the temperature to 980°C at a heating rate of 5°C / min , the calcination time is 2h, after the calcination is completed, the silicon tetrachloride gas is introduced into the chemical vapor phase deposition for 1h, the flow rate of the silicon tetrachloride gas is 2L / min, and then sintered at a constant temperature for 4h, the nano-silicon particles are uniformly deposited on the graphite particles, and the negative electrode is obtained material precursors.

[0025] (2) Take titanium dioxide, lithium carbonate and phenolic resin and disperse them in ...

Embodiment 2

[0029] The preparation method of the double-layer coated core-shell negative electrode material for the lithium ion battery described in this embodiment is specifically carried out according to the following steps:

[0030] (1) Take natural graphite particles with a median particle size of 8 μm and place them in the CVD furnace liner, feed nitrogen to remove the air in the CVD furnace until the oxygen content is ≤100ppm, and then raise the temperature to 800°C at a heating rate of 5°C / min , the calcination time is 5h, after the calcination is completed, the silicon tetrachloride gas is fed into the chemical vapor deposition for 2h, the flow rate of the silicon tetrachloride gas is 2L / min, and then sintered at a constant temperature for 4h, the nano-silicon particles are uniformly deposited on the graphite particles, and the negative electrode is obtained material precursors.

[0031] (2) Take titanium dioxide, lithium carbonate and phenolic resin and disperse them in an organic ...

Embodiment 3

[0035] The preparation method of the double-layer coated core-shell negative electrode material for the lithium ion battery described in this embodiment is specifically carried out according to the following steps:

[0036] (1) Take natural graphite particles with a median particle size of 10 μm and place them in the CVD furnace liner, pass nitrogen gas to remove the air in the CVD furnace until the oxygen content is ≤ 100ppm, and then raise the temperature to 700°C at a heating rate of 5°C / min , the calcination time is 5h, after the calcination is completed, the silicon tetrachloride gas is fed into the chemical vapor phase deposition for 4h, the flow rate of the silicon tetrachloride gas is 2L / min, and then sintered at a constant temperature for 4h, the nano-silicon particles are uniformly deposited on the graphite particles, and the negative electrode is obtained material precursors.

[0037] (2) Take titanium dioxide, lithium carbonate and phenolic resin and disperse them ...

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Abstract

The invention discloses a double-layer coated core-shell negative electrode material for lithium ion battery and a preparation method thereof. A CVD deposition method is used for depositing nano silicon on that graphite particle to obtain a precursor of a negative electrode material; The titanium dioxide, the lithium carbonate and the organic pyrolysis carbon source are dispersed in an organic solvent to prepare a gel; the precursor of anode material was added into the gel, and the core-shell structure anode material was prepared by low temperature treatment, homogeneous dispersion and high temperature reaction. The core of double-layer coated core-shell negative electrode material for the lithium ion battery is nano silicon and graphite, the nano silicon is deposited on the surface of graphite particles, the outer shell is an organic pyrolytic carbon layer, and the inner shell is formed by attaching lithium titanate to the inner wall of the organic pyrolytic carbon layer. The core-shell negative electrode material has high capacity, high rate and excellent cycling performance, and the preparation process is simple, green and pollution-free, suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a double-layer coated core-shell negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] In the context of environmental pollution and energy shortage, lithium-ion batteries are currently the main power source for new energy vehicles because of their clean, pollution-free, high-efficiency and recyclable characteristics. Electrode materials in lithium-ion batteries have a decisive impact on battery performance, and anode materials play a vital role in improving the performance of lithium-ion batteries. [0003] Silicon has an ultra-high theoretical specific capacity (4200mAh / g) and a low delithiation potential (<0.5V), and the voltage platform of silicon is slightly higher than that of graphite, which is difficult to cause lithium precipitation on the surface during charging, and has better safety perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/485H01M4/587H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 胡亮王浩张少波张小龙
Owner MAANSHAN KEDA PURUI ENERGY TECH CO LTD
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