Provided are a cathode material capable of achieving a higher discharge capacity and a higher discharge voltage, and obtaining superior charge-discharge characteristics, and a battery using the cathode material. A separator (15) is disposed between a cathode (12) and an anode (14). The cathode (12) comprises a lithium composite oxide represented by LiaMIbMIIcOd. MI represents at least two kinds selected from the group consisting of Mn, Ni and Co, and MII represents at least one kind selected from the group consisting of Al, Ti, Mg and B. Further, a, b, c and d are within a range satisfying 1.0 b+c, 1.8