Complex oxide materials and cathode materials for lithium ion battery
AssigneeShin-Kobe Electric Machinery Co., Ltd.
InventorsMasahiro Kasai, Toyotaka Yuasa
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Abstract
A lithium secondary battery that is highly safe and has long life. The battery, which is a nonaqueous lithium secondary battery, utilizes a cathode active material comprising a complex oxide material having a layered structure containing at least Li and Ni and being represented by the chemical formula LixNia(MnyM1-y)b(COzM′1-z)cO2(0<x<1.2, 0<y<1, 0<z<1, a+b+c=1, 9b≦5a+2.7, 0<a<1, 0<b<1, 0<c<1, M: quadrivalent element other than Mn, and M′: trivalent element other than Co).
Claims9
A complex oxide material with a layered structure containing at least Li and Ni, further comprising a quadrivalent element other than Mn and a trivalent element other than Co, said material being represented by a chemical formula LixNia(MnyM1-y)b(CozM′1-z)cO2(0<x<1.2, 0<y<1, 0<z<1, a+b+c=1, 9b≦5a+2.7, 0<a<1, 0<b<1, 0<c<1, M:
- quadrivalent element other than Mn, and M′:
- trivalent element other than Co) wherein the half-value width of any diffraction peak that appears at angles of 20° or greater and 80° or smaller in terms of 2θ value in an X-ray diffraction measurement using the Cu-kα line is 0.25 degrees or smaller.
A cathode active material for a lithium secondary battery containing at least Li and Ni, further comprising a quadrivalent element other than Mn and a trivalent element other than Co, said material being represented by a chemical formula LixNia(MnyM1-y)b(CozM′1-z)cO2(0<x<1.2, 0<y<1, 0<z<1, a+b+c=1, 9b≦5a+2.7, 0<a<1, 0<b<1, 0<c<1, M:
- quadrivalent element other than Mn, and M′:
- trivalent element other than Co) wherein the half-value width of any diffraction peak that appears at angles of 20° or greater and 80° or smaller in terms of 2θvalue in an X-ray diffraction measurement using the Cu-kα line is 0.25 degrees or smaller.
Dependencies are inferred from the claim text.