Lithium ion battery negative electrode active material
AssigneeDaido Steel Co., Ltd.
InventorsYuta Kimura, Kazuki Minami
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Abstract
The present invention relates to a lithium ion battery negative electrode active material that includes an Si phase, an Si—Zr compound phase, an Si—X compound phase, and an Sn—Cu compound phase, X being at least one element selected from the group that consists of Fe, Ni, Co, Mn, Ti, V, and Cr, the Sn—Cu compound phase fraction of the whole being 0.1-18 mass %, and the Si phase fraction being 10-90 mass %.
Claims20
A negative electrode active material for a lithium ion battery, the negative electrode active material comprising:
- a Si phase;
- a Si—Zr compound phase;
- a Si—X compound phase;
- and
- a Sn—Cu compound phase,
- wherein the element X is one element selected from the group consisting of Fe, Ni, Co, Mn, Ti, V, and Cr, and
- wherein the negative electrode active material has a proportion of the Sn—Cu compound phase of 0.1 mass % to 18 mass % and a proportion of the Si phase of 10 mass % to 90 mass % in the entire negative electrode active material.
A negative electrode active material for a lithium ion battery, the negative electrode active material comprising:
- a Si phase;
- a Si—Zr compound phase;
- a Si—X compound phase;
- and
- a Sn—Cu compound phase,
- wherein the element X is one or more elements selected from the group consisting of Fe, Ni, Co, Mn, Ti, V, and Cr,
- wherein the negative electrode active material has a proportion of the Sn—Cu compound phase of 0.1 mass % to 18 mass % and a proportion of the Si phase of 10 mass % to 90 mass % in the entire negative electrode active material, and
- having a proportion of Zr represented by [Zr]/([Zr]+[X]) (where [ ] indicates a content at % of the element in [ ]) of 1% to 30%.
A negative electrode active material for a lithium ion battery, the negative electrode active material comprising:
- a Si phase;
- a Si—Zr compound phase;
- a Si—X compound phase;
- and
- a Sn—Cu compound phase,
- wherein the element X is one or more elements selected from the group consisting of Fe, Ni, Co, Mn, Ti, V, and Cr,
- wherein the negative electrode active material has a proportion of the Sn—Cu compound phase of 0.1 mass % to 18 mass % and a proportion of the Si phase of 10 mass % to 90 mass % in the entire negative electrode active material,
- having the proportion of the Si phase of 25 mass % to 70 mass %, and
- having a proportion of Zr represented by [Zr]/([Zr]+[X]) (where [ ] indicates a content at % of the element in [ ]) of 1% to 30%.
Dependencies are inferred from the claim text.