Cathode for lithium-ion secondary battery, lithium-ion secondary battery, vehicle and power storage system equipped with the battery

Abstract

A cathode for a lithium-ion secondary battery is provided, which not only efficiently absorbs oxygen released from a solid solution based cathode active material when initial charging is applied but prevents a cathode energy density from lowering. Further, a lithium-ion secondary battery, a vehicle and a power storage system equipped with the lithium-ion secondary battery are provided. The cathode for a lithium-ion secondary battery comprises a cathode active material represented by the general formula: xLi2MO3-(1−x)LiM′O2 (where 0<x<1; M is at least one element selected from the group of Mn, Ti and Zr; and M′ is at least one element selected from the group of Ni, Co, Mn, Fe, Ti, Zr, Al, Mg, Cr and V), and an oxygen absorbing substance having both oxygen absorbing and lithium-ion intercalation/de-intercalation abilities. Herein, the oxygen absorbing substance is disposed on the cathode active material.

Dependencies are inferred from the claim text.