Method of preparing carbon anode active material of lithium-ion battery

A negative electrode active material and lithium-ion battery technology, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve problems such as difficulty in ensuring quality uniformity, difficulty in cost control, and multiple processing procedures, and achieve excellent cycle performance and good matching adaptability The effect of high electrochemical specific capacity of sex and volume

Active Publication Date: 2009-10-07
HUZHOU CHUANGYA POWER BATTERY MATERIALS
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Problems solved by technology

However, these methods also bring the problems of cost increase and quality uniformity difficult to guarantee
The Chinese patent No. 02804165.8 proposes a method of forming several selected raw materials - heat treatment - pulverization - secondary molding - secondary heat treatment - secondary pulverization, which greatly improves the structure and surface state of the negative active material. The electrochemical specific capacity and anti-attenuation ability have been simultaneously improved, but the longer manufacturing process and more processing steps have brought difficulties to cost control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The selected eigenvalue is 0.91, and C W =89% The mixture of the low-temperature carbonization product of the heavy product of coal tar processing and the low-temperature carbonization product of the heavy product of petroleum processing is used as the raw material. The above-mentioned raw material is solid, and the above-mentioned solid raw material is pulverized in an air-flow pulverizing device, and the average particle diameter of the pulverized particles is about 50 μm, and the particle size distribution range is 0-160 μm. The obtained particles were thermochemically reformed for 8.0 hours at a temperature of 580° C., in a nitrogen atmosphere, and a pressure of 1.0 MPa. The thermochemical reforming step is carried out in a back-mixed fluidized bed, and the particles are in motion during the whole process of thermochemical reforming. After thermochemical reforming, the product obtained in the thermochemical reforming step is cooled to 60°C and then pulverized into ...

Embodiment 2

[0029] The selected eigenvalue is 0.91, and C W =91% low temperature carbonization of soft pitch in coal tar processing is used as raw material. The above-mentioned raw material is solid, and the above-mentioned solid raw material is pulverized in an air-flow pulverizing device, and the average particle diameter of the pulverized particles is about 3 μm, and the particle size distribution range is 0-160 μm. The obtained particles were thermochemically reformed for 6.5 hours at a temperature of 600° C., in a nitrogen atmosphere, and a pressure of 2.0 MPa. The thermochemical reforming step is carried out in a rotating bed, and the particles are in motion during part of the thermochemical reforming. After thermochemical reforming, the product obtained in the thermochemical reforming step is cooled to 50°C and then pulverized into fine powder with mechanical pulverization equipment. The particle size of the pulverized micropowder is controlled to be about 28 μm, and the particle ...

Embodiment 3

[0031] The selected eigenvalue is 0.91, and C W =91% of the soft pitch low temperature carbonization product in coal tar processing is used as raw material. The above-mentioned raw material is solid, and the above-mentioned solid raw material is pulverized in an air-flow pulverizing device, and the average particle diameter of the pulverized particles is about 80 μm, and the particle size distribution range is 0-160 μm. The obtained particles were thermochemically reformed for 16.0 hours at a temperature of 720° C. in a nitrogen atmosphere and a pressure of 0.6 MPa. The thermochemical reforming step is carried out in a back-mixed fluidized bed, and the particles are in motion during the whole process of thermochemical reforming. The above thermochemical reformation product is directly graphitized at 2800° C. to obtain the lithium ion battery carbon negative electrode active material of the present invention. The lithium-ion battery made of this material is measured to have a...

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Abstract

The invention relates to a method of preparing carbon anode active material of lithium-ion battery. The prepartion method includes following steps: a materials selection step, selecting heavy products of coal tar processing, heavy products of petroleum processing, heavy products of hydrocarbon polycondensation or, one or multiple of their low-temperature carbonization products as materials; a crushing step, crushing materials obtained from the material selection step into micro-particles with an average grain diameter of 3-80 Mum and granularity distribution range of 0-160 Mum; a thermal chemistry reforming step, in inert atmosphere, the micro-particles obtained by the crushing step is thermal chemistry reformed in moving state; a carbonization or carbonization, graphitization step, products from the thermal chemistry reforming step is proceeded with carbonization or carbonization, graphitization. The lithium-ion battery of carbon anode active material prepared by using the invention is provided with advantages of stable quality, excellent circulation performance, outstanding antidamping ability, high volume electrochemicalspecific capacity.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery carbon negative electrode active material. Background technique [0002] At present, the practical lithium-ion battery anode materials are still mainly carbon-based materials, which are divided into two categories: artificial graphite and natural graphite according to the source or base. Hard carbon materials are negative electrode active materials that were found earlier to have better cycle characteristics. This feature is almost not affected by the charge and discharge rate. However, due to the major defect of high irreversible capacity loss, they have not been put into application. [0003] In the existing typical carbon negative electrode active material manufacturing technology, there is a two-stage modification process for natural graphite, that is, firstly treat the natural graphite raw material mechanically to increase its apparent density and improve its morphology; then ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/38C01B31/04
CPCY02E60/12Y02E60/10
Inventor 尚尔超郭雷胡博
Owner HUZHOU CHUANGYA POWER BATTERY MATERIALS
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