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
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Patent Information

Authority / Receiving Office
KR · KR
Patent Type
Patents
Current Assignee / Owner
DAIDO STEEL CO LTD
Filing Date
2022-09-26
Publication Date
2026-07-21

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.

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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.
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