| abstract |
The present invention relates to the formula (1): Li a (M x Mn 2−xy Y y ) (O 4−w Z w ) (where 1 <a ≦ 2.6, 0 ≦ x ≦ 1.2) 0 ≦ y, x + y <2, 0 ≦ w ≦ 1, M is at least one selected from Co, Ni, Fe, Cr and Cu; Y is Li, B, Na, Mg, Al, Ti, Si Mn composite oxide having a tetragonal structure represented by the formula (2): Li (Li x M 1 1− , at least one selected from K, Ca, and Z is at least one of F or Cl. xy Y y ) O 2 (where 0 ≦ x <0.3, 0 ≦ y <0.3. M is at least one selected from Co, Fe, Ni and Mn; Y is Mg And at least one selected from Al, Zr, Ti and Zn.). On the positive electrode to be. According to the present invention, a lithium secondary battery having a high capacity and excellent cycle characteristics can be provided. |