For a battery and a secondary battery using the same

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PROBLEM TO BE SOLVED : To avoid use of rare elements, and to improve cycle characteristics and preservation properties under high temperature. SOLUTION : A positive electrode for a battery contains as a positive electrode active material a transition metal composite oxide and satisfies, within a range of 50% to 90% of depth of discharge, a relation in which the minimum value I1of X-ray diffraction intensity with at least one or more X-ray diffraction peak to X-ray diffraction intensity I0at 100% of depth of discharge is to be I1/I0>0.5. COPYRIGHT : (C)2009, JPO&INPIT