| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cathode active substance to be used for a nonaqueous electrolyte secondary battery which is larger in a capacity and more excellent in safety. <P>SOLUTION: The cathode active substance is composed of granular complex metal oxide containing M<SP>1</SP>and M<SP>2</SP>(M<SP>1</SP>is one or more selected from Li, Na, and K, and M<SP>2</SP>is one or more selected from Ni, Co, Mn, and Fe) and an Al-containing compound which is placed on a surface of the above complex metal oxide, and of an NaFeO<SB>2</SB>type crystal structure. In a powder X-ray diffraction pattern of the above cathode active substance which is obtained by a powder X-ray diffraction measurement with CuKα as a radiation source, a half-value width of a diffraction peak representing a side (104) of the above NaFeO<SB>2</SB>type crystal is between a range of 0.250 or more and 0.290 or less, and in a lattice constant of the above NaFeO<SB>2</SB>type crystal, an a-axis is in a range of 2.874Å or more and 2.880Å or less and a c-axis in a range of 14.170Å or more and 14.180Å or less. <P>COPYRIGHT: (C)2007,JPO&INPIT |
