| abstract |
A cathode active material for a lithium secondary cell used in a cellular phone is disclosed. The cathode active material for the lithium secondary cell and the method the same having a high capacity and a long lifetime, different from LiCoO 2 and LiMn 2 O 4 , Li(Ni, Co)O 2 , and V-system oxide that has been researched as the active material for substituting LiCoO 2 are provided. The cathode active material for the lithium secondary cell in the next formula 1 is obtained by heating or chemically treating diadochite [Fe 2 (PO 4 )(SO 4 )(OH).6H 2 O] that is the mineral containing PO 4 3− , SO 4 2− , and OH − . n Li a Fe b M c (PO 4 ) x (SO 4 ) y (OH) z ( 1 ) n In the formula, M is at least one element selected from a radical consisting of Mg, Ti, Cr, Mn, Co, Ni, Cu, Zn, Al, and Si, with 0≦a, c≦0.5, 1≦b≦2, 0.5≦x, y, z≦1.5. |