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Graphite material at negative pole of lithium ion battery and preparation method thereof

A lithium-ion battery and graphite material technology, which is applied in the field of lithium-ion battery negative electrode graphite material and its preparation, can solve the problems of unsatisfactory product yield, difficult to obtain ingredients, complicated preparation process, etc., achieve capacity play and good cycle, and process The effect of being simple and easy to operate and having a wide range of raw material sources

Active Publication Date: 2011-06-29
福建杉杉科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a lithium-ion battery negative electrode in order to overcome the defects of the existing graphite negative electrode materials, such as complicated preparation process, difficult to obtain added components, unsatisfactory product yield and high cost. Graphite material and its preparation method

Method used

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  • Graphite material at negative pole of lithium ion battery and preparation method thereof
  • Graphite material at negative pole of lithium ion battery and preparation method thereof
  • Graphite material at negative pole of lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The raw material of mesophase carbon microspheres is crushed and classified in a crushing classifier to obtain a particle size D 50 = 25.6 μm powder, then carry out conventional graphitization high-temperature treatment (2500 ℃), obtain mesophase graphite, mix mesophase graphite and artificial graphite in a mass ratio of 70:30, and make lithium-ion battery negative electrode graphite material. The assembled button battery has a capacity of 353.6mAh / g and an initial efficiency of 91.6%.

Embodiment 2

[0032] The raw material of mesophase carbon microspheres is crushed and classified in a crushing classifier to obtain a particle size D 50 = 26.4 μm powder, then carry out conventional graphitization high-temperature treatment (2800 ℃), obtain mesophase graphite, mix mesophase graphite and artificial graphite in a mass ratio of 90:10, and make lithium-ion battery negative electrode graphite material. The assembled button battery has a capacity of 350.1mAh / g and an initial efficiency of 93.4%.

Embodiment 3

[0034] The raw material of mesophase carbon microspheres is crushed and classified in a crushing classifier to obtain a particle size D 50 = 16.7 μm powder, then carry out conventional graphitization high temperature treatment (2500 ℃), get mesophase graphite, mesophase graphite and artificial graphite are mixed uniformly by the mass ratio of 80:20, make lithium ion battery negative electrode graphite material. The assembled button cell has a capacity of 355.9mAh / g and an initial efficiency of 92.7%.

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Abstract

The invention discloses a graphite material at the negative pole of a lithium ion battery, which comprises interphase graphite and artificial graphite in mass ratio of 90:10 to 20:80. The graphite material has the advantages of highly compacted density, small specific surface area, high discharge capacity, long circulating life, high charge-discharge efficiency and high product performance-price ratio. The invention also provides a method for preparing the graphite material, which has the advantages of simple, convenient and feasible technology, wide raw material sources and lower cost.

Description

technical field [0001] The invention specifically relates to a lithium ion battery negative electrode graphite material and a preparation method thereof. Background technique [0002] The mesophase carbon microsphere graphitization product is an excellent lithium-ion battery negative electrode material. In recent years, lithium-ion batteries have been widely used in mobile phones, notebook computers, digital cameras and portable appliances. Lithium-ion batteries have excellent performances such as high energy density, high working voltage, small size, light weight, no pollution, fast charging and discharging, and long cycle life. They are ideal energy sources for development in the 21st century. Mesophase graphite, as the negative electrode material of lithium-ion secondary batteries, has the characteristics of low potential, good flatness, high specificity, high initial charge and discharge efficiency, and good processability. Theoretically LiC 6 The reversible lithium st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/1393C01B31/04B01J13/02
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 谢秋生乔永民李智华李辉
Owner 福建杉杉科技有限公司
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