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AssigneeNational Institute of Advanced Industrial Science and Technology
InventorsMasahiro Mori, Shingo Tanaka, Tomonari Takeuchi, Hikari Sakaebe
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A foreign element-containing vanadium sulfide contains, as constituent elements, vanadium, sulfur, and a foreign element, wherein the compositional ratio of the foreign element to the vanadium (M1/V) is in the range of 0.05 to 1.5 in terms of molar ratio; the compositional ratio of the sulfur to the vanadium (S/V) is in the range of 3.0 to 10.0 in terms of molar ratio; and the foreign element includes at least one member selected from the group consisting of Nb, Ti, Zr, Mo, Sc, and Y, or includes at least one member selected from the group consisting of Li, B, N, O, F, Mg, S, Cl, Ca, Br, Sr, Sc, I, Fe, Co, Ni, Zn, Y, Mo, Tc, and Cd. The foreign element-containing vanadium sulfide is an electrode active material for a lithium ion secondary battery that exhibits satisfactorily high initial capacity and that provides improved electrochemical performance or cycle performance.
A foreign element-containing vanadium sulfide comprising, as constituent elements, vanadium, sulfur, and an element other than vanadium and sulfur (foreign element M1),
A foreign element-containing vanadium sulfide comprising, as constituent elements, vanadium, sulfur, and an element other than vanadium and sulfur (foreign element M2),
A foreign element-containing vanadium sulfide, which has a composition represented by formula (1):
Dependencies are inferred from the claim text.