Negative electrode and secondary battery comprising the same

By using uncoated artificial graphite particles as the negative electrode active material, the problems of insufficient fast charging performance and lifespan characteristics of existing negative electrode materials are solved, achieving high energy density and excellent charging performance, reducing battery thickness, and preventing degradation of charging characteristics.

CN115362573BActive Publication Date: 2026-03-17LG ENERGY SOLUTION LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-07-06
Publication Date
2026-03-17

AI Technical Summary

Technical Problem

Existing anode materials have shortcomings in terms of fast charging performance and lifespan characteristics. In particular, the irregular structure of natural graphite leads to problems such as electrolyte penetration and decomposition, while artificial graphite has low discharge capacity, resulting in poor energy density and charging efficiency of secondary batteries.

Method used

By using uncoated artificial graphite particles as the negative electrode active material, and by adjusting the particle size and crystallite size of the primary and secondary particles, the resulting negative electrode active material layer can be smoothly rolled, reducing the electrode and battery thickness, increasing energy density, and improving fast charging performance and lifespan characteristics.

Benefits of technology

A high-energy-density rechargeable battery has been achieved, featuring excellent fast-charging performance and lifespan characteristics, reduced battery thickness, and no degradation in charging characteristics.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present application relates to a negative electrode excellent in rapid charging performance and life characteristics, and a secondary battery including the same, and relates to a negative electrode including a current collector and a negative electrode active material layer formed on the current collector, wherein the negative electrode active material layer includes a negative electrode active material including uncoated artificial graphite particles composed of secondary particles formed by aggregation of a plurality of primary particles, the average particle diameter (D 50 ) of the primary particles is 7 μm to 10 μm, the average particle diameter (D 50 ) of the secondary particles is 15 μm to 20 μm, and the uncoated artificial graphite particles have a crystal size La(100) of 200 nm to 300 nm in the a-axis direction and a crystal size Lc(002) of 50 nm to 100 nm in the c-axis direction at the time of XRD analysis.
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Citation Information

Patent Citations

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