| 摘要 |
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<SUB>2 </SUB>and LiMn<SUB>2</SUB>O<SUB>4</SUB>, Li(Ni, Co)O<SUB>2</SUB>, and V-system oxide that has been researched as the active material for substituting LiCoO<SUB>2 </SUB>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<SUB>2</SUB>(PO<SUB>4</SUB>)(SO<SUB>4</SUB>)(OH).6H<SUB>2</SUB>O] that is the mineral containing PO<SUB>4</SUB><SUP>3-</SUP>, SO<SUB>4</SUB><SUP>2-</SUP>, and OH<SUP>-</SUP>. <?in-line-formulae description="In-line Formulae" end="lead"?>Li<SUB>a</SUB>Fe<SUB>b</SUB>M<SUB>c</SUB>(PO<SUB>4</SUB>)<SUB>x</SUB>(SO<SUB>4</SUB>)<SUB>y</SUB>(OH)<SUB>z</SUB> (1)<?in-line-formulae description="In-line Formulae" end="tail"?> 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.
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