Graphite material, method for producing the same, negative electrode material, and lithium ion battery

By forming appropriate pore structures and interconnected pores in graphite materials, the problem of limited rate performance and cycle performance of natural graphite materials in lithium-ion batteries has been solved, achieving high-current charge and discharge effects with safe process and low equipment requirements.

CN117963906BActive Publication Date: 2026-06-19BTR NEW MATERIAL GRP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BTR NEW MATERIAL GRP CO LTD
Filing Date
2023-12-25
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

The rate performance and cycle performance of existing natural graphite materials in lithium-ion batteries are limited, mainly due to the problem of layer peeling caused by the long diffusion distance and volume expansion during lithium-ion insertion and extraction.

Method used

By forming a pore structure with a pore size of 2nm to 120nm and a total pore volume of 0.015cm3/g to 0.035cm3/g in graphite material, and by calcining and purification treatment to make the pores interconnected, anisotropy is reduced, lithium-ion diffusion distance is shortened, and transport channels and insertion/deintercalation sites are increased.

Benefits of technology

It significantly improves the rate performance of graphite materials, enabling high-current charging and discharging, and the process is simple, safe, and uses widely available raw materials with low equipment requirements.

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Abstract

This application relates to the field of lithium-ion battery anode material technology, and more particularly to a graphite material and its preparation method, an anode material, and a lithium-ion battery. The graphite material has pores with a pore size of 2 nm to 120 nm and a total pore volume of 0.015 cm³. 3 / g~0.035cm 3 / g. In the graphite material of this application, the pores formed on the graphite material connect the various graphite layers to each other, which can reduce the anisotropy of the graphite material and shorten the diffusion distance of lithium ions, thereby improving the rate performance of the graphite material; and since the pore diameter range and pore volume of the etched pores on the graphite material are appropriate, it is possible to maximize the increase of lithium ion transport channels in the material without significantly affecting the material capacity, thereby greatly improving the rate performance of the material and realizing high-current charging and discharging.
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