Electrode material for lithium-ion battery and Si alloy composite powder
AssigneeDaido Steel Co., Ltd.
InventorsKazuki Minami, Yuta Kimura
Life of this patent
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Abstract
The present invention relates to an electrode material for lithium ion battery, containing: a graphite powder; and a Si alloy composite powder, in which the Si alloy composite powder has an average particle diameter of 5 μm or less and contains Si particles, Si—X compound particles (X=Fe, Ni, Cr, Co, Mn, Zr, or Ti), and at least one of Sn—Y compound particles and Al—Y compound particles (Y=Cu, Fe, Ni, Cr, Co, Mn, Zr, or 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.
Claims9
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.
A Si alloy composite powder,
- having an average particle diameter of 5 μm or less,
- comprising:
- Si particles;
- Si—X compound particles;
- and at least one of Sn—Y compound particles and Al—Y compound particles, wherein
- 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, and
- a proportion of the Si particles in the Si alloy composite powder is 30 mass % to 95 mass %, 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.
Dependencies are inferred from the claim text.