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Lithium ion battery cathode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in electrode manufacturing, battery electrodes, active material electrodes, etc., can solve the problems of weakened coating effect, high cost, large pollution, etc., and achieve low production cost, high specific capacity, reduced The effect of equipment investment

Active Publication Date: 2010-02-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of organic solvents (such as acetone, toluene, ether, etc.) or precious metals are used in the above-mentioned preparation method
Not only is there more pollution in the production process, but also the cost is high
In addition, the graphite composite material prepared by resin pyrolytic carbon as the coating material will agglomerate during the curing process after the coating is completed, so the composite material must be pulverized, which will re-expose the active surface of the graphite, and the coating weakened effect

Method used

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  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Dissolve 5g of coal tar pitch-based aqueous mesophase in 500ml of deionized water, add 5g of natural graphite, add dropwise 1 drop of Tween 80, heat up to 60°C and stir for 4 hours, then evaporate to dryness, and then dry in an oven at 100°C for 15 hours. The obtained composite material was placed in a high-temperature carbonization furnace, and under the protection of nitrogen, the temperature was raised to 800 °C at a heating rate of 5 °C / min, and after a constant temperature of 2 hours, it was naturally cooled to room temperature; Under the protection of nitrogen, the temperature was raised to 2500 °C at a rate of 5 °C / min, heat treated at a constant temperature for 1 h, and then naturally cooled to room temperature to obtain an aqueous mesophase / graphite composite electrode material.

[0020] Mix 0.6g of the composite material evenly with conductive carbon black, sodium hydroxymethyl cellulose and styrene-butadiene rubber in a mass ratio of 92:3:2.5:2.5, prepare slur...

Embodiment 2

[0022] Dissolve 5g of needle coke-based aqueous mesophase in 500ml of deionized water, add 25g of artificial graphite, add dropwise 1 drop of Tween 80, heat up to 65°C and stir for 5h, then evaporate the water to dryness, and then dry in an oven at 120°C for 10h. The obtained composite material was placed in a high-temperature carbonization furnace, and under the protection of nitrogen, the temperature was raised to 1000 °C at a heating rate of 10 °C / min, and after a constant temperature of 1 h, it was naturally cooled to room temperature; Under the protection of nitrogen, the temperature was raised to 2800 °C at a rate of 10 °C / min, heat treated at a constant temperature for 1 h, and then naturally cooled to room temperature to obtain an aqueous mesophase / graphite composite electrode material.

[0023] Mix 0.6g of the composite material evenly with conductive carbon black, sodium hydroxymethyl cellulose and styrene-butadiene rubber in a mass ratio of 92:3:2.5:2.5, prepare slur...

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Abstract

The invention relates to a lithium ion battery cathode material and a preparation method thereof. The lithium ion battery cathode material is prepared by adopting an aqueous mesophase and graphite powder as raw materials in percentage of 1:1-1:20. The preparation method comprises the following steps: dissolving the aqueous mesophase into water and adding the graphite powder according to a certainproportion; dropwise adding a surface active agent and uniformly stirring in a stirring device; heating to 60-70 DEG C and continuously stirring; heating to 80-90 DEG C, continuously stirring and evaporating water; then drying in a vacuum drying box; placing the obtained graphite composite material in a carbonization furnace, carbonizing by the protection of nitrogen and naturally cooling to roomtemperature; carrying out graphitization processing on a sample by the protection of the nitrogen, naturally cooling to the room temperature and obtaining the aqueous mesophase and graphite compositeelectrode material. The invention has the advantages of environmental protection and simple preparation process and is easy for mass production. The prepared composite electrode material has high first efficiency and reversible capacity and favorable cycle performance.

Description

technical field [0001] The invention relates to a negative electrode material of a lithium ion battery and a preparation method thereof, in particular to an aqueous interphase / graphite composite negative electrode material for a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, high working voltage, long cycle life, no pollution, and good safety performance, making them have broad application prospects in portable electronic devices, electric vehicles, space technology, defense industry, etc. It has been a research hotspot that has attracted wide attention in recent years. [0003] One of the key technologies of lithium-ion batteries lies in the research on negative electrode materials, so as to improve the performance of batteries. Graphite material has the characteristics of good conductivity, high crystallinity, low price, and high safety. It is currently the most imp...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/38H01M4/62H01M4/04
CPCY02E60/12Y02E60/10
Inventor 王成扬施啸奔陈明鸣赵朔王瑨
Owner TIANJIN UNIV