Preparation method of artificial graphite cathode material

An artificial graphite negative electrode and graphite crushing technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of reduced yield, increased equipment energy consumption, expensive price, etc., to achieve easy scale production, increase yield, The effect of reducing energy consumption

Active Publication Date: 2013-10-09
FANGDA CARBON NEW MATERIAL CO LTD
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Problems solved by technology

The existing automatic spheroidization system mainly has the following problems: the equipment is mainly designed for the spheroidization of natural flake graphite, and the power of the air vortex superfine powder machine used is the same. Spinning superfine powder will cause the spheroidized particles to be broken again, resulting in damage to the sphericity and a decrease in yield; in addition, in the late stage of spheroidization, some superfine materials have been recovered, and the materials participating in spheroidization have been greatly reduced. Using a high-power airflow vortex ultrafine powder machine for spheroidization will increase the energy consumption of the equipment
In patent CN101924209A, the needle coke is modified by catalytic graphitization and coating to obtain an artificial graphite negative electrode material with better performance; however, the raw material for its preparation is needle coke, which is expensive and the preparation process is complicated
In patent CN1691374A, the coating material is dissolved in a solvent and then coated on the surface of artificial graphite. The prepared artificial graphite negative electrode material has a low specific surface area and high first-time Coulombic efficiency; however, a large amount of solvent is introduced during the preparation process, and the process is complicated and has a great impact on the environment.
Patent CN1649192A crushes high-temperature asphalt to below 2 μm and mixes it with natural graphite. The first Coulombic efficiency of the prepared natural graphite anode material reaches 92%; The coating effect is slightly poor, and the asphalt is required to be crushed to less than 2 μm during the preparation process. It is extremely difficult for the existing micro-powder equipment to meet the process requirements

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  • Preparation method of artificial graphite cathode material
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Embodiment 1

[0026] Embodiment 1: a kind of preparation method of artificial graphite negative electrode material, comprises the following steps:

[0027] (1) Crush graphite with a particle size of less than 4mm and spheroidize it. After spheroidization, the median diameter of graphite powder is 15-22μm, and the specific surface area is less than 7m 2 / g, the tap density is greater than 0.85g / cm 3 ;

[0028] (2) Crush the coating material asphalt to a median diameter of 3-5 μm;

[0029] (3) Weigh 80-95 parts by weight of graphite powder in step (1), 5-20 parts by weight of asphalt micro-powder in step (2), put them in a conical mixer for rough mixing for at least 10 minutes, then discharge, and then mix the Put the materials in the mechanical fusion machine, then start the mechanical fusion machine, and fuse at a speed of 500r / min~1000r / min for 15~60min, so that the asphalt is coated on the graphite surface, and then discharge;

[0030] (4) Put the pitch-coated graphite powder in step (...

Embodiment 2

[0035] Take ultra-high-power graphite electrode powder with a particle size of less than 4mm (Fangda Carbon New Material Technology Co., Ltd.), through two 120kw air-flow vortex ultra-fine powder machines, four 90kw air-flow vortex ultra-fine powder machines, and 70kw air-flow vortex ultra-fine powder The spheroidization system composed of 4 micropowder machines in series will spheroidize it. After spheroidization, the median diameter of artificial graphite powder is 15μm, and the specific surface area is 6.4m 2 / g, tap density 0.88g / cm 3, Get 30kg of artificial graphite micropowder after spheroidization. Then high-temperature modified asphalt (Huanghua Xinnuo Lixing Coal Chemical Co., Ltd.) was pulverized by a jet mill (Weifang Zhengyuan Powder Equipment Co., Ltd.), with a median diameter of 4.5 μm, and 1.5 kg of pulverized asphalt powder was taken. Put the above-mentioned artificial graphite micropowder and asphalt micropowder in a conical mixer (Wuxi Qingxin Powder Equipme...

Embodiment 3

[0037] Take ultra-high-power graphite joint pieces with a particle size of less than 4mm (Fangda Carbon New Material Technology Co., Ltd.), through 4 sets of 100kw air-flow vortex ultra-fine powder machines, 4 sets of 70kw air-flow vortex ultra-fine powder machines, and 50kw air-flow vortex ultra-fine powder The automatic spheroidization system composed of 4 micropowder machines in series will spheroidize it. After spheroidization, the median diameter of artificial graphite micropowder is 18μm, and the specific surface area is 5.6m 2 / g, tap density 0.90g / cm 3 , Get 30kg of artificial graphite micropowder after spheroidization. Then the mesophase pitch (Fangda Carbon New Material Technology Co., Ltd.) was pulverized with a jet mill (Weifang Zhengyuan Powder Equipment Co., Ltd.), with a median diameter of 3.4 μm, and 7.5 kg of pitch fine powder was taken. Put the above-mentioned artificial graphite micropowder and asphalt micropowder in a conical mixer (Wuxi Qingxin Powder Equ...

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Abstract

The invention discloses a preparation method of an artificial graphite cathode material, and particularly relates to a preparation method of a clad lithium ion battery artificial graphite cathode material. The preparation method comprises the following steps: after reforming the artificial graphite by pulverization, cladding an ultramicropowder cladding material on the artificial graphite in a mechanical fusion machine, roasting, and graphitizing to obtain the artificial graphite cathode material with superior performance. The method is environment-friendly and can easily implement large-scale production; and the specific capacity per gram of the prepared lithium ion battery graphite cathode material exceeds 350 mAh / g, the initial Coulomb efficiency exceeds 94%, the tap density is greater than 1.1 g / cm<3>, and the specific area is less than 2 m<2> / g.

Description

technical field [0001] The invention relates to a method for covering artificial graphite negative electrode materials of lithium ion batteries. Background technique [0002] The artificial graphite negative electrode material has good cycle performance and rate performance, good selectivity to electrolyte, and is suitable for use as a lithium battery for electric vehicles and other power. [0003] Ordinary artificial graphite anode materials mostly use a spheroidization system to crush and shape the artificial graphite and sell it directly. The existing automatic spheroidization system mainly has the following problems: the equipment is mainly designed for the spheroidization of natural flake graphite, and the power of the air vortex superfine powder machine used is the same. Spinning superfine powder will cause the spheroidized particles to be broken again, resulting in damage to the sphericity and a decrease in yield; in addition, in the late stage of spheroidization, so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393
CPCY02E60/10
Inventor 齐仲辉舒平徐立宏张桂兰蔺文
Owner FANGDA CARBON NEW MATERIAL CO LTD
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