A negative electrode active material and a lithium ion battery using the same

By forming an amorphous carbon and sodium tetraborate coating layer on the surface of graphite particles, the problem of poor high-temperature storage performance of artificial graphite anode materials is solved, and the high-temperature stability and cycle performance of lithium-ion batteries are improved.

CN116995205BActive Publication Date: 2026-07-03EVE POWER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
EVE POWER CO LTD
Filing Date
2023-07-18
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing lithium-ion batteries that use artificial graphite as the negative electrode active material have poor high-temperature storage performance and suffer from problems such as numerous surface defects, large volume expansion rate, poor cycle performance, and safety hazards.

Method used

By mixing graphite particles, amorphous carbon, and sodium tetraborate, spray drying is carried out to form a coating layer, which is then heat-treated at high temperature to form a uniform coating layer to modify the surface of graphite particles, reduce side reactions and oxidation reactions, and improve conductivity and cycle performance.

Benefits of technology

It improves the high-temperature storage performance and cycle stability of the negative electrode active material, reduces impedance and polarization, and enhances the oxidation resistance of the material.

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Abstract

This invention provides a negative electrode active material, the preparation method of which includes the following operations: S1. Mixing graphite particles, sodium tetraborate, and amorphous carbon, and using the resulting mixed particles to form a slurry, thereby obtaining a mixed slurry. The feeding amounts of the above materials meet the following conditions: the mass ratio of graphite particles to amorphous carbon is 2-4:6-8, and the mass ratio of sodium tetraborate to graphite particles is 0.07-0.12:1. The graphite particles include artificial graphite; S2. Spray drying the mixed slurry, using the resulting solid particles as a precursor; S3. Heating the precursor at 2000-3000°C for 18-34 hours to obtain the negative electrode active material. The negative electrode active material provided by this invention possesses good conductivity, cycle characteristics, and storage performance, especially its storage performance under high-temperature conditions.
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