US 12,438,146 B2
Electrode material for lithium-ion battery and Si alloy composite powder
Kazuki Minami, Nagoya (JP); and Yuta Kimura, Nagoya (JP)
Assigned to Daido Steel Co., Ltd., Nagoya (JP)
Appl. No. 18/693,463
Filed by DAIDO STEEL CO., LTD., Nagoya (JP)
PCT Filed Sep. 26, 2022, PCT No. PCT/JP2022/035797
§ 371(c)(1), (2) Date Mar. 19, 2024,
PCT Pub. No. WO2023/054289, PCT Pub. Date Apr. 6, 2023.
Claims priority of application No. 2021-161674 (JP), filed on Sep. 30, 2021.
Prior Publication US 2024/0396016 A1, Nov. 28, 2024
Int. Cl. H01B 1/04 (2006.01); C01B 33/06 (2006.01); H01M 4/36 (2006.01); H01M 4/38 (2006.01); H01M 4/587 (2010.01)
CPC H01M 4/364 (2013.01) [C01B 33/06 (2013.01); H01B 1/04 (2013.01); H01M 4/386 (2013.01); H01M 4/587 (2013.01); C01P 2004/61 (2013.01); C01P 2004/62 (2013.01); C01P 2004/64 (2013.01); C01P 2006/20 (2013.01); C01P 2006/40 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An electrode material for lithium ion battery, comprising:
a graphite powder; and
a Si alloy composite powder, wherein
the Si alloy composite powder has an average particle diameter of 5 μm or less and contains Si particles, Si—X compound particles, and at least one of Sn—Y compound particles and Al—Y compound particles,
an element X constituting the Si—X compound particles is at least one element selected from the group consisting of Fe, Ni, Cr, Co, Mn, Zr, and Ti,
an element Y constituting the Sn—Y compound particles and the Al—Y compound particles is at least one element selected from the group consisting of Cu, Fe, Ni, Cr, Co, Mn, Zr, and Ti,
a proportion of the Si particles in the Si alloy composite powder is 30 mass % to 95 mass %, and
a coverage of the Si alloy composite powder on a surface of graphite particles is 5% or more, and
wherein the Si particles are particles consisting only of a Si phase, or particles in which 95 mass % or more of the particles consist of a Si phase, and
the Si—X compound particles are particles consisting only of a Si—X compound, or particles in which 95 mass % or more of the particles consist of a Si—X compound.