Preparation method of hollow graphite material and hollow graphite material prepared by same

A graphite material and hollow technology, which is applied in the field of hollow graphite materials, can solve the problems that the porosity and specific surface area of ​​hollow materials are difficult to meet the requirements, and achieve the effects of easy large-scale production, increased specific surface area, and increased embedding volume

Active Publication Date: 2014-04-30
BTR NEW MATERIAL GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The method for preparing hollow materials mentioned above not only involves complex processes such as chemical oxidation stripping method and W / O emulsion self-assembly method, hydrothermal reaction or use of catalysts, but also the prepared hollow materials are difficult to obtain in terms of porosity and specific surface area. Satisfies the requirements as an anode material for lithium-ion batteries

Method used

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  • Preparation method of hollow graphite material and hollow graphite material prepared by same
  • Preparation method of hollow graphite material and hollow graphite material prepared by same
  • Preparation method of hollow graphite material and hollow graphite material prepared by same

Examples

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Effect test

Embodiment 1

[0038] Add 400g of natural spherical graphite powder with an average particle size of 16-19μm and a carbon content of 99.95% and 1L of water into the ball mill tank, stir evenly, and add 4kg of zirconia balls with a diameter ratio of 10mm:5mm:3mm=5:3:2 , the ball milling speed is 480r / min, the ball milling time is 5-25h, after modification, suction filtration, drying, and passing through a 200-mesh sieve, the hollow graphite material is obtained.

Embodiment 2

[0040] Add 400g of natural spherical graphite powder with an average particle size of 16-19μm and a carbon content of 99.95% and 2L of ethanol into the ball mill pot, stir evenly, and add 12kg of zirconia balls with a diameter ratio of 10mm:5mm:3mm=5:3:2 , the ball milling speed is 640r / min, the ball milling time is 25-40h, after the modification, it is suction filtered, dried, and passed through a 200 mesh sieve to obtain the hollow graphite material.

Embodiment 3

[0042] Add 400g of natural spherical graphite powder with an average particle size of 16-19μm and a carbon content of 99.95% and 2L of water into the ball milling tank, stir evenly, add 8kg of zirconia balls with a diameter of 3mm, the ball milling speed is 640r / min, and the ball milling time is 25- After 40 hours, after modification, filter with suction, dry, and pass through a 200-mesh sieve to obtain a hollow graphite material.

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Abstract

The invention relates to a preparation method of a hollow graphite material and a hollow graphite material prepared by the same. The preparation method comprises the following steps: adding the grinding balls, a ball milling medium and graphite powder into a ball milling tank at a mass ratio of (2-30):(1-10):1; performing ball milling for 5-60 hours on ball milling equipment at a speed of 100-800r/min; and removing the ball milling medium and drying. The hollow graphite material prepared by the method has the characteristics of high specific surface area, high porosity and lamellar form and can increase the embedded quantity of the embedded atoms and guarantee the embedding uniformity; by adopting the mechanically modified ball milling technology, the method is simple to operate and facilitates large-scale production.

Description

technical field [0001] The invention relates to the technical field of graphite materials, in particular to a method for preparing a hollow graphite material and the prepared hollow graphite material. Background technique [0002] Anode materials have a significant impact on the performance of lithium-ion batteries. Graphite anode materials have been widely used in the field of anodes due to their stable performance, high cycle efficiency, and good cycle life. However, their actual capacity is close to the theoretical capacity, and their lithium intercalation potential Lithium-ion batteries are low and prone to lithium precipitation, which has potential safety hazards, and has been unable to meet the requirements of high energy density, long life and high safety for lithium-ion batteries in smart mobile communication devices and micro tools in recent years. Therefore, new negative electrodes have become the focus of research and development to improve the performance of lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/21
Inventor 岳敏周海辉苗恒任建国黄友元
Owner BTR NEW MATERIAL GRP CO LTD
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