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Method for preparing lithium ion battery silicon carbon composite anode material and product prepared by method

A lithium-ion battery and silicon-carbon composite technology, which is applied to battery electrodes, negative electrodes, active material electrodes, etc., can solve the problems of being easily damaged, and achieve the effects of easy large-scale production, optimized quality and structure, and low production costs

Active Publication Date: 2015-05-20
HUZHOU CHUANGYA POWER BATTERY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the PVC coating is brittle and easy to be damaged

Method used

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  • Method for preparing lithium ion battery silicon carbon composite anode material and product prepared by method
  • Method for preparing lithium ion battery silicon carbon composite anode material and product prepared by method
  • Method for preparing lithium ion battery silicon carbon composite anode material and product prepared by method

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Add aluminum-silicon alloy powder to excess 8% hydrochloric acid solution, and continue to stir magnetically. After the alloy in the alloy is completely dissolved, wash it with deionized water three times, put it in HF solution and stir for 2 hours, and then use deionized water several times. Wash and dry the material in vacuum, the drying time is 8 hours, the drying temperature is 80°C, and then placed in an organic solution for dispersion, magnetically stirred for 2 hours, and then added asphalt for stirring (the mass ratio of asphalt to silicon is 6:1) , the stirring time is 2 hours, and then artificial graphite is added for stirring for 4 hours (the mass ratio of silicon and artificial graphite is 1:15). Carry out carbonization in a carbonization furnace, the carbonization temperature is 1000°C, the heat preservation time is 6 hours, and the heating rate is 5°C / min. After the carbonization is completed, the material is pulverized and passed through a 200-mesh sieve. ...

Embodiment 2

[0042] Add iron-silicon alloy powder to excess 8% hydrochloric acid solution, and continue to stir magnetically. After the alloy in the alloy is completely dissolved, wash it with deionized water three times, put it in HF solution and stir for 2 hours, and then use deionized water several times. Wash and dry the material in vacuum, the drying time is 8 hours, the drying temperature is 80°C, and then placed in an organic solution for dispersion, magnetically stirred for 2 hours, and then added asphalt for stirring (the mass ratio of asphalt to silicon is 6:1) , the stirring time is 2h, and then artificial graphite is added for stirring for 4h (the mass ratio of silicon and artificial graphite is 1:15). Carry out carbonization in a carbonization furnace, the carbonization temperature is 1000°C, keep warm for 6 hours, and the heating rate is 5°C / min. After the carbonization is completed, crush the material and pass through a 200-mesh sieve. Then put the sieved product in absolute...

Embodiment 3

[0045]Add the manganese-silicon alloy powder into excess 8% hydrochloric acid solution, and keep magnetically stirring until the alloy in the alloy is completely dissolved, wash it with deionized water three times, put it in HF solution and stir for 2 hours, and then use deionized water several times Wash and dry the material in vacuum, the drying time is 8 hours, the drying temperature is 80°C, and then placed in an organic solution for dispersion, magnetically stirred for 2 hours, and then added asphalt for stirring (the mass ratio of asphalt to silicon is 6:1) , the stirring time is 2 hours, and then artificial graphite is added for stirring for 4 hours (the mass ratio of silicon and artificial graphite is 1:15). Carry out carbonization in a carbonization furnace, the carbonization temperature is 1000°C, the heat preservation time is 6 hours, and the heating rate is 5°C / min. After the carbonization is completed, the material is pulverized and passed through a 200-mesh sieve....

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Abstract

The invention relates to a method for preparing a lithium ion battery silicon carbon composite anode material and a product prepared by the method and belongs to the technical field of a lithium ion battery anode material. The method comprises the following steps of adding silicon alloy powder into an acid liquor until the alloy is completely dissolved, washing by de-ionized water, placing into a hydrogen fluoride (HF) solution and stirring, again washing by the de-ionized water, performing vacuum drying, and dispersing into a dispersing agent to prepare a silicon powder dispersion liquid; uniformly mixing graphite, a binder and the silicon powder dispersion liquid; performing secondary vacuum drying; carbonizing; placing a carbonized product into the dispersing agent, adding a coating agent and uniformly stirring; performing third vacuum drying; and re-carbonizing. The mechanical stress generated due to volume expansion and shrinkage of silicon in charge and discharge processes can be relieved by a double-layer bonding and cladding model structure, thereby eliminating the volume effect.

Description

technical field [0001] The invention belongs to the field of preparation methods of lithium-ion battery composite materials, and in particular relates to a lithium-ion battery negative electrode composite material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in various portable electronic devices and electric vehicles because of their advantages such as high specific energy, high battery voltage, wide operating temperature range, stable discharge, and long storage life. At present, the commercial lithium-ion battery anode materials are mainly carbon anode materials, and its theoretical specific capacity (372 mAh / g) can no longer meet the demand. Therefore, it is imminent to develop new anode materials with high capacity, high compaction density, and high cycle performance. , has become the focus of current research. [0003] Silicon has attracted widespread attention because of its high theoretical specific capacity (...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587
CPCH01M4/1393H01M4/1395H01M4/362H01M4/386H01M4/583H01M2004/027Y02E60/10
Inventor 谢锐王双才郭雷吕猛胡博
Owner HUZHOU CHUANGYA POWER BATTERY MATERIALS
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