Cathode material of composite carbon in use for lithium ion battery and preparation method

一种锂离子电池、负极材料的技术，应用在电极制造、电池电极、二次电池等方向，能够解决性能不尽如人意、放电容量低等问题，达到易于操作、制备工艺简单、成本低廉的效果

Active Publication Date: 2005-11-16
BTR NEW MATERIAL GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Japanese Patent No. 2000-261046 discloses a graphite powder treated by thermal oxidation to change the surface state of the graphite powder. Although the reactivity between the negative electrode material and the electrolyte is improved, the discharge capacity is lower than that of natural graphite.
U.S. Pat. No. 6403259 discloses a carbon material coated on the surface by grinding natural graphite or artificial graphite, which improves the high-temperature self-discharge performance and low-temperature performance of the negative electrode material, but the performance in other aspects is not satisfactory

Method used

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  • Cathode material of composite carbon in use for lithium ion battery and preparation method
  • Cathode material of composite carbon in use for lithium ion battery and preparation method
  • Cathode material of composite carbon in use for lithium ion battery and preparation method

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preparation example Construction

[0029] The preparation method of lithium ion battery composite carbon negative electrode material of the present invention comprises the following steps:

[0030] 1. Add natural flake graphite, microcrystalline graphite, artificial graphite or mesophase carbon microspheres with a particle size of 45 to 500 μm into the high-speed pulverizer of a jet mill, high-pressure pulverizer or rod mechanical pulverizer, and grind at 3000~ Pulverize at a speed of 6000rpm for 10 to 90 minutes to obtain graphite powder;

[0031] 2. Add graphite powder to the low-speed impact ball mill, airflow vortex mill, ultrafine mill, ultramicro ball mill, internally classified impact micro-powder mill or pendulum mill for low-speed impact spheroidization In the pulverizer, shape and spheroidize at a speed of 600-3000rpm for 40-180 minutes to obtain spherical graphite;

[0032] 3. The particles smaller than 5μm and larger than 75μm in spherical graphite are removed by airflow classifier, jet classifier,...

Embodiment 1

[0055] The natural graphite with a particle size of 500 μm and a carbon content of 90% is pulverized by a rotary high-speed pulverizer at a rotation speed of 6000rpm for 10 minutes, and then spheroidized by a low-speed impact-type spheroidizer at a rotation speed of 3000rpm for 40 minutes. After the particle size distribution is 5-75μm, put 100kg of the above-mentioned graphite into the reaction kettle, add 35kg of mixed acid of sulfuric acid and nitric acid, add an appropriate amount of water and stir for 10 minutes, stir and reflux at 300°C for 18 hours, and then add 15kg of ferric chloride , add water and stir into a paste, react for 2 hours, add water to cool, then continue to add water and wash at a speed of 1000 rpm in the centrifugal filter washing equipment for 30 minutes until the pH value is neutral, and centrifugally dehydrate until the moisture content is less than 30%. Dry at 105°C for 2 hours until the moisture is less than 0.2%, and the fixed carbon content of th...

Embodiment 2

[0058] 200 kg of natural graphite with a particle size of 75 μm and a carbon content of 90% was pulverized by a rotary high-speed pulverizer at a rotation speed of 5500 rpm for 20 minutes, and then spheroidized by a low-speed impact-type spherical pulverizer at a rotation speed of 2500 rpm for 60 minutes. After adjusting the particle size distribution, put 100kg of the above-mentioned graphite into the reaction kettle, add 35kg of mixed acid of sulfuric acid and nitric acid, add appropriate amount of water and stir for 15 minutes, stir and reflux at 360°C for 12 hours, then add 15kg of ferric chloride, add water and stir Make a paste, react for 2 hours, add water to cool, add water and wash in the centrifugal filter washing equipment at a speed of 300 rpm for 60 minutes until the pH value is neutral, and centrifugally dehydrate until the moisture content is less than 30%, in the oven at 100 ° C Dry for 2 hours until the moisture is less than 0.2%, and the fixed carbon content o...

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Abstract

The disclosed composite carbon material of negative pole in lithium ion cell is composite graphite including spherical graphite and covering layer, which is pyrolytic carbon of organic matter. Inserted transition metal elements are contained between layers of graphite crystal. Preparation method is as following: crushing graphite, shaping and sphericized, purifying treatment, washing, dewatering and drying, dipped in salt solution doped by transition metal in multivalence, mixed with organic matter, covering treatment, and carbonizing treatment or graphitization treatment. Comparing with prior art, the disclosed material of negative pole possesses advantages of fine capability of embedding lithium and taking off lithium, high cyclical stability, reversible specific capacity larger than 350mAh / g, coulomb efficiency higher than 94% at first cycle, conservation rate for capacity larger than 80% in 500 times of circulation.

Description

technical field [0001] The invention relates to a battery negative electrode material and a preparation method thereof, in particular to a lithium-ion battery composite carbon negative electrode material and a preparation method thereof. Background technique [0002] The oil crisis in the 1960s and 1970s and the increasing population made the contradiction of resource shortage increasingly prominent. Especially today, when people pay more and more attention to environmental protection, green power sources have developed rapidly. Lithium-ion batteries are a new generation of secondary batteries following the nickel-hydrogen batteries since the 1990s. And because of its advantages such as high working voltage, high energy density, long cycle life, small self-discharge, and no memory effect, it has become the preferred chemical power source for high-end electronic consumer products, and has penetrated into aerospace, military and other cutting-edge technology fields. With its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/58H01M10/36
CPCH01M4/587H01M10/0525H01M4/1393Y02E60/122Y02E60/10H01M4/583
Inventor 岳敏张万红
Owner BTR NEW MATERIAL GRP CO LTD
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