Negative electrode material for non-aqueous lithium secondary battery, method for manufacturing the same, and non-aqueous lithium secondary battery using the same
First Claim
1. A negative electrode material for a non-aqueous lithium secondary battery comprising a metal material M consisting of solid phases A and B, a graphite material, and a carbonaceous material having a crystallinity lower than that of said graphite material, wherein said metal material M has a structure in which a part or all of the surface of a core particle consisting of said solid phase A is covered with said solid phase B;
- said solid phase A contains at least silicon as a constituent element; and
said solid phase B is a solid solution or intermetallic compound of (a) silicon and (b) at least one element selected from the group consisting of elements in the group 2, transition metal elements, elements in the group 12, elements in the group 13 and elements excepting carbon and silicon in the group 14 of the periodic table.
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Abstract
The present invention relates to a negative electrode material for a non-aqueous lithium secondary battery comprising a metal material M consisting of solid phases A and B, a graphite material, and a carbonaceous material having a crystallinity lower than that of said graphite material, wherein said metal material M has a structure in which a part or all of the surface of a core particle consisting of said solid phase A is covered with said solid phase B; said solid phase A contains at least silicon as a constitutive element; and said solid phase B is a solid solution or an intermetallic compound of silicon and a specific element.
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Citations
20 Claims
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1. A negative electrode material for a non-aqueous lithium secondary battery comprising a metal material M consisting of solid phases A and B, a graphite material, and a carbonaceous material having a crystallinity lower than that of said graphite material, wherein said metal material M has a structure in which a part or all of the surface of a core particle consisting of said solid phase A is covered with said solid phase B;
- said solid phase A contains at least silicon as a constituent element; and
said solid phase B is a solid solution or intermetallic compound of (a) silicon and (b) at least one element selected from the group consisting of elements in the group 2, transition metal elements, elements in the group 12, elements in the group 13 and elements excepting carbon and silicon in the group 14 of the periodic table. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- said solid phase A contains at least silicon as a constituent element; and
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11. A method for manufacturing a negative electrode material for a non-aqueous lithium secondary battery, wherein a metal material M, a graphite material and a precursor of a carbonaceous material which is an organic material are mixed and baked in an inactive atmosphere;
- said metal material M consists of solid phases A and B, and has a structure in which a part or all of the surface of a core particle consisting of said solid phase A is covered with said solid phase B;
said solid phase A includes at least silicon as a constituent element;
said solid phase B is a solid solution or intermetallic compound of (a) silicon and (b) at least one element selected from the group consisting of elements in the group 2, transition metal elements, elements in the group 12, elements in the group 13 and elements except carbon and silicon in the group 14 of the periodic table. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
- said metal material M consists of solid phases A and B, and has a structure in which a part or all of the surface of a core particle consisting of said solid phase A is covered with said solid phase B;
Specification