Positive electrode active material for nonaqueous electrolyte secondary battery
AssigneesSumitomo Chemical Company, Limited, Kyushu University, National University Corporation
InventorsShigeto Okada, Jun-ichi Yamaki, Yusuke Takahashi, Kenji Nakane
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Abstract
Disclosed is a positive electrode active material for nonaqueous electrolyte secondary batteries which contains a complex oxide mainly containing sodium, nickel and a tetravalent metal while having a hexagonal structure. This positive electrode active material enables to obtain a nonaqueous electrolyte secondary battery with high operating voltage. The complex oxide is preferably expressed as Na[Na(1/3-2x/3)Ni(x-y)M(2/3-x/3-y)A2y]O2 (wherein M represents one or more tetravalent metals, A represents one or more trivalent metals, 0<x≦0.5, 0≦y<1/6, and x>y).
Claims9
A positive electrode active material for non-aqueous electrolyte secondary battery wherein the positive electrode active material comprises a composite oxide containing mainly sodium, nickel, and a tetravalent metal, and having a hexagonal crystal structure, and wherein the composite oxide is represented by Na[Na(1/3-2x/3)Ni(x-y)M(2/3-x/3-y)A2y]O2 wherein M represents one or more tetravalent metals, A represents one or more trivalent metals, 0<x≦0.5, 0≦y<⅙, and x>y.
Dependencies are inferred from the claim text.