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Method for preparing lithium battery anode material by internal thermal lengthwise graphitization furnace

A graphitization furnace and internal heat series connection technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of high irreversible capacity, low capacity, unstable raw material quality, etc., and achieve the goal of shortening the production cycle and reducing energy consumption Effect

Inactive Publication Date: 2013-04-24
KAIFENG CARBON CO LTD OF CHINA PINGMEI SHENMA GRP
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Problems solved by technology

The third is to use the graphite fragments produced during the graphite electrode processing of electric furnace steelmaking as raw materials, and prepare negative electrode materials by crushing and grading. Since the raw materials are by-products, the cost of this type of material is the lowest, but it has a large specific surface area, high irreversible capacity, and low capacity. High, unstable quality of raw materials and other issues

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  • Method for preparing lithium battery anode material by internal thermal lengthwise graphitization furnace
  • Method for preparing lithium battery anode material by internal thermal lengthwise graphitization furnace

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with specific embodiments.

[0019] refer to figure 1 , the general process for the preparation of lithium battery graphite negative electrode materials is: use natural graphite or artificial graphite as raw material, after crushing and shaping, process the graphite raw material into spherical particles with a D50 of 5-25 μm, and use strong acid (such as HCl, HF, HNO 3 etc.) to remove impurities to reduce the content of magnetic substances such as Si and Fe in graphite. After removing impurities, in order to reduce the specific surface area of ​​graphite powder, it is necessary to modify the surface of graphite particles, that is, artificially coat a layer of carbon on the surface of graphite particles. However, because graphite powder is easy to agglomerate during the coating process, it needs to be sieved. After removing the massive material, it is subjected to high-temperature heat treatment, tha...

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Abstract

The invention discloses a method for preparing lithium battery anode material by an internal thermal lengthwise graphitization furnace. At first, graphite crucibles are adopted, and are filled with anode material semi-finished products, and crucible covers (4) are tightened up after the anode material semi-finished products are compacted; then, the crucibles are horizontally placed in the internal thermal lengthwise graphitization furnace, and are connected through flexible graphite annuluses, and thermal insulation materials cover the crucibles after the crucibles are loaded in the whole internal thermal lengthwise graphitization furnace; next, the power-on heating operation is carried out, and the heating curve is as follows: the room temperature is 3,200 DEG C and the heating speed is 5 to 8 DEG C / min; and at last, the natural cooling is carried out after the heating is finished, and the graphitization operation is over after the cooling is finished. The graphitization temperature is high, which is beneficial for reducing the special surface area of the anode material, and improving the true density of the material and the initial charging / discharging efficiency. The original production period is about 15 days, and is shortened to 7 days at present, and meanwhile, the energy consumption of the graphitization stage of the product can be reduced.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material of a lithium battery, in particular to a method for preparing a negative electrode material of a lithium battery by utilizing internal heat in series with graphitization furnaces. Background technique [0002] There are three main production technologies for graphite anode materials in the market: [0003] (1) Preparation of spheroidized natural graphite material [0004] Natural graphite anode materials prepared by crushing, shaping, impurity removal, asphalt coating, low-temperature carbonization, high-temperature graphitization and sieving have the advantages of small specific surface area, low irreversible capacity, high specific capacity, and good processability. However, the safety performance is poor. As people pay more and more attention to the safety performance of lithium-ion batteries, the demand for such materials is currently stable, and the growth rate is expe...

Claims

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Application Information

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IPC IPC(8): H01M4/583
CPCY02E60/12Y02E60/10
Inventor 路培中于嗣东贾庆远陈敬全杨旭冯俊杰赵东锋娄卫江吴振华刘运平吕红兵程小可
Owner KAIFENG CARBON CO LTD OF CHINA PINGMEI SHENMA GRP
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