Lithium ion secondary battery anode material and preparation method

Abstract

The invention relates to a lithium ion secondary battery anode material and a preparation method. The lithium ion secondary battery anode material adopts the unburned carbon of fuel fly ash as a carbon material. The invention also provides the preparation method for the lithium ion secondary battery anode material. The preparation method comprises the following steps of: grinding the unburned carbon in a ball mill, and performing heat treatment, wherein a temperature range required by the heat treatment is 2,000 to 3,200 DEG C; and preserving heat for a certain time, cooling the unburned carbon to room temperature, performing acid treatment by adopting acidic aqueous solution, and thus obtaining power which is unburned carbon graphite powder as the lithium ion secondary battery anode material. After kinds of analysis are performed on the unburned carbon graphite powder, the graphitizing grade and crystallinity of the unburned carbon graphite powder are increased, and the unburned carbon graphite powder with such a structure and such components has relatively higher capacity retentions, simultaneously meets the requirements of relatively lower cost and environmental friendliness and is proved to be sufficient to serve as the lithium ion secondary battery anode material.

Description

technical field [0001] The present invention relates to a negative electrode material of a lithium ion secondary battery and a preparation method thereof, in particular to a negative electrode material of a lithium ion secondary battery using unburned carbon of fuel (or coal) fly ash as a carbon material, and a related preparation method . Background technique [0002] The so-called lithium-ion secondary battery refers to a lithium-ion battery that can be charged and discharged. It is widely used in portable 3C electronic products, and with the increasing improvement of portable 3C electronic products, the existing lithium-ion The energy density of secondary batteries cannot meet people's needs gradually, so the main technologies of lithium-ion secondary battery materials will need to be redeveloped and improved, including lighter volume, weight, and higher battery energy density, etc. However, It will also be a very important issue to develop lower-cost and environmentally...

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Problems solved by technology

[0006] In order to solve the defects of existing polymorphic carbon materials as negative electrode materials of lithium-ion secondary batteries, the cost of graphitized carbon materials is high, the preparation method is cumbersome, and it does not meet the environmental protection requirements of reducing carbon emissions and resource recycling. The invention provides a lithium-ion secondary battery negative electrode material and its preparation method

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