Process for preparing carbon coated graphite microparticles

A technology of graphite micropowder and carbon coating, which is applied in the treatment of dyed polymer organic compounds and fibrous fillers. The effect of long discharge platform and low charge and discharge voltage

Inactive Publication Date: 2003-02-19
TSINGHUA UNIV
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  • Abstract
  • Description
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Problems solved by technology

However, due to the co-intercalation of small molecules such as electrolytes, the expansion and contraction of graphite will cause the graphite sheets to fall off, resulting in a larger irreversible capacity and a reduced cycle life.
Graphite cannot be used in PC (propylene carbonate) electrolyte, and PC is an ideal electrolyte for lithium-ion batteries, so the application of graphite in lithium-ion batteries is limited

Method used

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  • Process for preparing carbon coated graphite microparticles
  • Process for preparing carbon coated graphite microparticles
  • Process for preparing carbon coated graphite microparticles

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Embodiment Construction

[0011] The present invention is a preparation method of carbon-coated graphite micropowder used as a lithium-ion battery negative electrode material, figure 1 Shown is a schematic diagram of the preparation of carbon-coated graphite powder. Carbon-coated graphite powder is prepared by spray granulation. Firstly, the graphite powder, resin and ethanol used as the carbon coating layer are mixed at a volume ratio of 1:1:1 to form a suspension, and the prepared suspension is sprayed at a high speed. In this process, due to the effect of surface energy, the fluid resin liquid will flow and shrink, and the graphite powder will be coated to form coated graphite, and then the composite powder obtained by spray granulation , dried in hot air, and then carbonized at 700-1200°C to obtain carbon-coated graphite powder (such as figure 2 shown). The resin used for the cladding layer is phenolic resin, epoxy resin, or furfural resin. Above-mentioned graphite micropowder is natural microc...

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Abstract

A process for preparing carbon coated graphite microparticles used as negative electrode material of Li-ion battery features use of spray granulating method. It can elongate the service life of Li-ion battery.

Description

technical field [0001] The invention belongs to the technical scope of preparation of battery electrode materials, in particular to the preparation of a carbon-coated graphite micropowder which has good cycle stability and can be used in a dielectric solution containing propylene carbonate (PC) as a lithium-ion battery negative electrode material. method. Background technique [0002] Because graphite material has the advantages of low charge and discharge voltage for lithium batteries, long charge and discharge platform, and good cycle life, it has been commercialized as an anode material for lithium ion batteries. However, due to the co-intercalation of small molecular substances such as electrolytes, graphite expansion and contraction lead to graphite flakes falling off, resulting in a large irreversible capacity and a reduced cycle life. Graphite cannot be used in PC (propylene carbonate) electrolyte, and PC is an ideal electrolyte for lithium-ion batteries as an electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/46C09C3/10
Inventor 沈万慈何明刘旋康飞宇郑永平
Owner TSINGHUA UNIV
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