Negative active material, negative electrode for lithium secondary battery comprising same, and lithium secondary battery

By adjusting the particle size difference between graphite and silicon-based active materials, the problem of poor dispersion of active materials in lithium secondary batteries was solved, achieving uniform dispersion of the electrodes and improving their lifespan characteristics.

CN122095463APending Publication Date: 2026-05-26LG ENERGY SOLUTION LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
LG ENERGY SOLUTION LTD
Filing Date
2025-06-02
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In existing lithium-ion batteries, the particle size difference between silicon-based and graphite-based active materials leads to reduced electrode dispersion, resulting in the formation of clusters and deterioration of battery performance.

Method used

By adjusting the average particle size difference between graphite and silicon-based active materials, the absolute value of the particle size difference between natural graphite and artificial graphite is kept within 10%, and the absolute value of the particle size difference between silicon-based active materials and artificial graphite is kept within 40%, thus ensuring uniform dispersion.

Benefits of technology

It improves the dispersibility of the negative electrode active material, suppresses local volume expansion and stress concentration, and improves the service life characteristics of the electrode.

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Abstract

This invention relates to a negative electrode active material, a negative electrode for a lithium secondary battery comprising the same, and a lithium secondary battery. The negative electrode active material comprises a silicon-based active material and graphite, wherein the graphite comprises natural graphite and artificial graphite, the absolute value of the ratio of the difference in average particle size (D50) between the natural graphite and the artificial graphite to the average particle size of the artificial graphite is 10% or less, and the absolute value of the ratio of the difference in average particle size (D50) between the silicon-based active material and the artificial graphite to the average particle size of the artificial graphite is 40% or less.
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