Electrode materials for lithium-ion batteries and Si alloy composite powder

The Si alloy composite powder with graphite mixture addresses the volume expansion issue in silicon-based electrodes, enhancing both initial discharge capacity and cycle characteristics in lithium-ion batteries.

KR102993964B1Active Publication Date: 2026-07-21DAIDO STEEL CO LTD
View PDF 7 Cites 0 Cited by

Patent Information

Application Number
KR1020247010204
Authority / Receiving Office
KR · KR
Patent Type
Patents
Current Assignee / Owner
Priority Date
2021-09-30
Filing Date
2022-09-26
Publication Date
2026-07-21
Estimated Expiration
2042-09-26

AI Technical Summary

Technical Problem

Conventional lithium-ion battery electrode materials using silicon (Si) face issues with large volume expansion and contraction due to Li ion absorption and release, leading to particle breakage and poor cycle characteristics.

Method used

A Si alloy composite powder with finely divided particles (≤5 μm) and a mixture with graphite, including Si-X, Sn-Y, and Al-Y compounds, providing a buffer for expansion and avoiding stress concentration, with a coverage rate of 5% or more on graphite surfaces.

Benefits of technology

Enhances battery characteristics by maintaining initial discharge capacity and improving cycle characteristics through controlled expansion and reduced particle disintegration.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure R1020247010204_ABST
    Figure R1020247010204_ABST
Patent Text Reader

Abstract

The present invention relates to an electrode material for a lithium-ion battery, wherein graphite powder and Si alloy composite powder are mixed, and the Si alloy composite powder has an average particle size of 5 μm or less and comprises at least one of Si particles, Si-X compound particles (X = Fe, Ni, Cr, Co, Mn, Zr, Ti), Sn-Y compound particles (Y = Cu, Fe, Ni, Cr, Co, Mn, Zr, Ti), and Al-Y compound particles, wherein the proportion of Si particles in the Si alloy composite powder is 30 to 95 mass%, and the coverage rate of the surface of the graphite particles by the Si alloy composite powder is 5% or more.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Nonaqueous electrolyte secondary battery

    JP2005209496A

  • Negative electrode active material for electrical device, and electrical device using same

    KR1020180061352A

  • Negative electrode active material for lithium-ion battery, negative electrode for lithium-ion battery and lithium-ion battery

    KR1020200096876A

  • Anode material, method for producing the same, anode for lithium-ion secondary battery, and lithium-ion secondary battery

    JP2013168328A

  • Nagative electrode active material for lithium ion battery, and negative electrode for lithium ion battery using the same

    KR1020130035930A