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Method for preparing carbon fiber/antimony sulfide composite negative electrode of lithium ion battery

A lithium ion battery and antimony sulfide technology, applied in the field of lithium ion batteries, can solve the problems of poor conductivity of the antimony sulfide negative electrode, change in the volume of lithium intercalation, complicated preparation process, etc., so as to improve the cycle and rate performance, shorten the transmission path and the preparation process. simple effect

Active Publication Date: 2019-11-22
湖南恩捷前沿新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the complex preparation process and high cost of the existing technology, and the poor conductivity of the antimony sulfide negative electrode and the serious volume change of lithium intercalation, the present invention proposes a method for preparing a carbon fiber / antimony sulfide composite negative electrode for lithium-ion batteries

Method used

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  • Method for preparing carbon fiber/antimony sulfide composite negative electrode of lithium ion battery
  • Method for preparing carbon fiber/antimony sulfide composite negative electrode of lithium ion battery
  • Method for preparing carbon fiber/antimony sulfide composite negative electrode of lithium ion battery

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Embodiment 1

[0023] Weigh stibnite and carbon fiber according to the mass ratio of 1:1, add them to the ball milling tank, add ball milling beads according to the mass ratio of balls to material 20:1, and add ball milling media according to the mass ratio of alcohol to material 2:1. Start the ball mill, ball mill at 450r / min for 4 hours, and filter and dry after stopping to obtain the mixture. figure 1 It is a scanning electron microscope picture of the carbon fiber conductive matrix used, it can be seen that the diameter of the carbon fiber is 50-150 nm, and the length is 1-10 μm.

[0024] Place the above dry mixture in an argon atmosphere, raise the temperature to 620°C at 3°C / min, and keep it warm for 5 hours. After natural cooling, the molten stibnite adheres to the carbon fiber and recrystallizes to form nano-sized antimony sulfide grains , and thus obtain a carbon fiber@stibnite composite anode.

[0025] figure 2 The scanning electron microscope image of the carbon fiber@stibnite ...

Embodiment 2

[0028] Weigh high-purity antimony sulfide and carbon fiber according to the mass ratio of 80:20, add them to the ball milling tank, add ball milling beads according to the mass ratio of balls to material 15:1, ball mill in air medium at 600r / min for 1h, filter and dry after stopping, and obtain Mixture.

[0029] Place the above dry mixture in an argon atmosphere, raise the temperature to 580°C at 1°C / min, and keep it warm for 10 hours. After natural cooling, the molten stibnite adheres to the carbon fiber and recrystallizes to form nano-sized antimony sulfide grains , and thus obtain a carbon fiber@stibnite composite anode.

Embodiment 3

[0031] Weigh stibnite and carbon fiber according to the mass ratio of 10:90, add them to the ball milling tank, add ball milling beads according to the mass ratio of balls to material 20:1, ball mill in argon medium at 400r / min for 5h, filter and dry after stopping, and obtain Mixture.

[0032] Place the above dry mixture in an argon atmosphere, raise the temperature to 650°C at 10°C / min, and keep it warm for 5 hours. After natural cooling, the molten stibnite adheres to the carbon fiber and recrystallizes to form nano-sized antimony sulfide grains , and thus obtain a carbon fiber@stibnite composite anode.

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Abstract

The invention discloses a method for preparing a carbon fiber / antimony sulfide composite negative electrode of a lithium ion battery. Natural stibnite can be directly used as an electrode active substance, and carbon fiber is used as a conductive matrix. The novel negative electrode material in which the carbon fiber matrix is coated with the nanoscale antimony sulfide is synthesized through melting. The structure effectively releases the stress change in the antimony sulfide crystal grains in the lithium embedding process; meanwhile, the transmission path of Li<> and electrons in the materialis shortened, the carbon fiber matrix provides an excellent conductive network for the composite material, and because the natural stibnite can be used as a direct raw material of an electrode activesubstance, a high-energy-consumption and high-pollution metallurgy purification process is removed; the nano composite material is prepared by adopting a solid-phase mixed melting method, and a wastetreatment process is removed.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a carbon fiber / antimony sulfide composite negative electrode of a lithium ion battery. Background technique [0002] In lithium-ion batteries, the performance of electrode materials directly determines the energy density, service life and sales price of the battery. As one of the main bodies of lithium storage, the comprehensive performance of the negative electrode is very important. When graphite materials are used as negative electrodes, they have the advantages of stable structure, high first efficiency, and good electrical conductivity. However, its low theoretical specific capacity can no longer meet the needs of the future market for high specific energy lithium-ion batteries. Among many new anodes, antimony sulfide has attracted extensive attention of researchers due to its high theoretical specific capacity, moderate plateau potenti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y40/00
CPCB82Y40/00H01M4/362H01M4/5815H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 刘芳洋赖延清蒋良兴贾明李劼刘业翔汪齐杨海超
Owner 湖南恩捷前沿新材料科技有限公司
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