Modified graphite and its preparing method

A graphite and modification technology, applied in the field of modified graphite and its preparation, can solve the problems of high cost, difficult industrial production, and difficult process, and achieve the effects of low cost, long cycle life and simple process
CN1581544AInactive Publication Date: 2005-02-16BYD CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BYD CO LTD
Publication Date
2005-02-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

Modified graphite includes granules of graphite core material and amorphous carbon membrane layer. Distance of between micro crystal layers d002 as 0.335-0.340 nm. Specific surface area of modified graphite is 1.3-4.2m2 / g and average particle diameter is 8-35 micro. The preparing method includes following steps: dipping granules of graphite core material in solution of polymer coating materials; then through mixing, separating, sieving, solidifying and carbonizing steps. Advantages are: large current, higher reversible specific capacity, longer cycle life. Features are simple, low cost and easy for industrialization production.
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Description

【Technical field】

[0001] The invention relates to a modified graphite and a preparation method thereof, more specifically to a modified graphite with excellent high-current performance and a preparation method thereof. 【Background technique】

[0002] With the rapid development of the electronics industry and the information industry, people have higher and higher requirements for the power supply of various electrical products. Lithium-ion secondary batteries have developed rapidly and are widely used in the past ten years due to their superior comprehensive performance.

[0003] As the functions of electrical products, especially portable electrical products, are becoming more and more complex, and the volume is becoming smaller and smaller, the requirements for the power supply are also increasing, which is reflected in: sufficiently high volumetric energy density, superior high-current performance, suitable cycle life and reliability. The safety performance, especially th...

Claims

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