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Graphite anode material for lithium-ion battery and preparation method of graphite anode material

A lithium-ion battery and graphite negative electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high cost and low yield in large-scale production, and achieve the effects of low price, abundant sources, and excellent rate performance

Inactive Publication Date: 2016-04-13
JIANGXI ZHENGTUO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material has the advantages of high specific capacity and good cycle stability, but it is prepared by spray drying method, which has the problems of low yield and high cost of large-scale production

Method used

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  • Graphite anode material for lithium-ion battery and preparation method of graphite anode material
  • Graphite anode material for lithium-ion battery and preparation method of graphite anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Petroleum coke with a fixed carbon mass content greater than or equal to 99.5% is crushed by a 70 machine, shaped by a ball mill, and sieved to obtain a particle size distribution of D10 greater than or equal to 2 microns, D50 of 8-10 microns, D90 of 30 microns or less, and an aspect ratio of 3 The primary particle between -15; Take by weighing this primary particle of 100 parts of quality, the asphalt of 5 parts of quality, the ferric oxide of 1 part of quality, the carbon tetrachloride of 5 parts of quality, be placed in high-temperature reactor, inert Under the protection of the atmosphere, heat and stir, among which 300 ° C for 6 hours, 600 ° C for 6 hours, and then cool and discharge; the material after granulation is graphitized at 3400 ° C for 10 hours, and the final product is obtained after classification or sieving (SEM diagram see figure 1 ).

[0036] Active material (prepared graphite material), conductive agent (superP carbon black), sodium carboxymethyl ce...

Embodiment 2

[0039]Petroleum coke with a fixed carbon mass content greater than or equal to 99.5% is crushed by a 70 machine, shaped by a ball mill, and sieved to obtain a particle size distribution of D10 greater than or equal to 2 microns, D50 of 8-10 microns, D90 of 30 microns or less, and an aspect ratio of 3 The primary particle between -15; Take this primary particle of 100 parts of quality, the bitumen of 15 parts of quality, the ferric oxide of 5 parts of quality, the carbon tetrachloride of 15 parts of quality, be placed in high-temperature reactor, inert Under the protection of the atmosphere, heat and stir, among which 300 ° C for 6 hours, 800 ° C for 6 hours, then cool and discharge; the material after granulation is graphitized at 2600 ° C for 48 hours, and the final product is obtained after classification or sieving.

[0040] Its charge and discharge capacity is 358.2mAh / g, the initial efficiency is 95.7%, and the 100-cycle cycle capacity retention rate is 99.09% (the button ...

Embodiment 3

[0042] Petroleum coke with a fixed carbon mass content greater than or equal to 99.5% is crushed by a 70 machine, shaped by a ball mill, and sieved to obtain a particle size distribution of D10 greater than or equal to 2 microns, D50 of 8-10 microns, D90 of 30 microns or less, and an aspect ratio of 3 The primary particle between -15; Take by weighing this primary particle of 100 parts of quality, the asphalt of 30 parts of quality, the ferric oxide of 10 parts of quality, the carbon tetrachloride of 30 parts of quality, be placed in high-temperature reactor, inert Under the protection of the atmosphere, heat and stir, among which 300 ° C for 6 hours, 800 ° C for 6 hours, then cool and discharge; the material after granulation is graphitized at 3000 ° C for 24 hours, and the final product is obtained after classification or sieving.

[0043] Its charge and discharge capacity is 361.0mAh / g, the initial efficiency is 96.2%, and the 100-cycle cycle capacity retention rate is 99.17...

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Abstract

The invention provides a graphite anode material for a lithium-ion battery and a preparation method of the graphite anode material. According to the method, with coke as a raw material, primary particles with certain shapes and particle size distribution are obtained by crushing, shaping and sieving; the coke obtained by crushing, shaping and sieving is evenly mixed with an adhesive, graphitization catalyst and an assistant under protecting and heating conditions of an inert gas; secondary granulation is carried out through mechanical action; secondary particles are formed by bonding two or more primary particles; catalytic graphitization high-temperature treatment is carried out on the secondary particles under the protection of the inert gas; and the final product is obtained by grading or sieving. The graphite material provided by the invention is used as an anode for the lithium-ion battery, and has the advantages of high compaction density, high specific capacity, long cycle lifetime, excellent heavy-current charge-discharge property, good high and low temperature performance, low expansion rate and the like.

Description

technical field [0001] The invention relates to a graphite negative electrode material for a lithium ion battery and a preparation method thereof, belonging to the technical field of lithium batteries. Background technique [0002] Compared with traditional lead-acid, nickel-cadmium, nickel-metal hydride and other secondary batteries, lithium-ion secondary batteries have high working voltage, small size, light weight, high capacity density, no memory effect, no pollution, small self-discharge and good cycle life. Long life and other advantages. Since Sony successfully commercialized lithium-ion batteries in 1991, lithium-ion batteries have become the dominant power source for mobile phones, notebook computers and digital products, and are increasingly used in electric vehicles and energy storage. The changes of 3C digital products are changing with each passing day, and the functions of the products are diversified and complicated. The functions of each smartphone upgrade h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M10/0525C01B31/04
CPCH01M4/587H01M10/0525Y02E60/10
Inventor 褚相礼丁侠靓张建峰吴壮雄黄雨生
Owner JIANGXI ZHENGTUO NEW ENERGY TECH CO LTD
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