| abstract |
An active material for a lithium secondary battery having a large discharge capacity and excellent high rate discharge characteristics, a lithium secondary battery, and a method for manufacturing the same. An active material for a lithium secondary battery containing a solid solution of a lithium transition metal composite oxide having an α-NaFeO type 2 crystal structure, and a lithium secondary battery containing the same, wherein the metal contained in the solid solution The composition ratio of the elements is Li 1+ (x / 3) Co 1-xyz Ni y / 2 Mg z / 2 Mn (2x / 3) + (y / 2) + (z / 2) (x> 0, y> 0, z> 0, x + y + z <1), an X-ray diffraction pattern that can be assigned to the space group P3 1 12, and diffraction peaks of the (003) plane and the (114) plane by X-ray diffraction measurement. The intensity ratio is I (003) / I (114) ≧ 1.15. Moreover, it is a manufacturing method of the lithium secondary battery characterized by the process to charge. [Selection figure] None |