| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a positive active material which provides a nonaqueous electrolyte secondary battery having an excellent cycle characteristics. <P>SOLUTION: A positive active material comprises a lithium-containing metal oxide having a unit cell expressed by the general formula (1), LiFe<SB POS="POST">1-x</SB>M<SB POS="POST">x</SB>P<SB POS="POST">1-y</SB>Si<SB POS="POST">y</SB>O<SB POS="POST">4</SB>(where M represents at least one element selected from group III to XIV elements, 0<x<1, and 0<y<1). The positive active material has a half-value width of a diffraction peak of (011) face of 0.30° or larger. The unit cell of the material expressed by the general formula (1) has a volume of 291.4 to 300.0 Å<SP POS="POST">3</SP>or 285.0 to 291.0 Å<SP POS="POST">3</SP>. <P>COPYRIGHT: (C)2012,JPO&INPIT |
