| 摘要 |
Disclosed is a cathode active material (and secondary battery comprising the same) comprising a combination of a lithium manganese composite oxide having a spinel structure represented by the following Formula 1 with a lithium nickel composite oxide represented by the following Formula 2, the cathode active material having a broad potential region at 3.0 to 4.8V upon initial charge:
LixMyMn2−yO4−zAz (1)wherein 0.9≦x≦1.2, 0<y<2, and 0≦z<0.2;M is at least one element selected from the group consisting of Al, Mg, Ni, Co, Fe, Cr, V, Ti, Cu, B, Ca, Zn, Zr, Nb, Mo, Sr, Sb, W, Ti and Bi; andA is at least one monovalent or bivalent anion, and
Li1+y′Niz′M′1−z′O2−z″A′z″ ( 2)wherein 0≦y′≦0.1, 0.5<z′≦0.9, and 0≦z″<0.2;M′ is at least one selected from the group consisting of elements stable for 6-coordination, including Mn, Co, Mg and Al; andA′ is at least one monovalent or bivalent anion. |
| 代理机构 |
Birch, Stewart, Kolasch & Birch, LLP |
代理人 |
Birch, Stewart, Kolasch & Birch, LLP |
| 主权项 |
1. A cathode active material comprising
a combination of a lithium manganese composite oxide having a spinel structure represented by the following Formula 3 with a lithium nickel composite oxide represented by the following Formula 2, wherein the oxide of Formula 3 is mixed with the oxide of Formula 2 in a weight ratio of 50:50 to 99:1, the cathode active material having a potential region (potential plateau) at 3.0 to 4.8V upon initial charge:
LixNiyMn2−yO4 Formula 3 wherein 0.9≦x≦1.2, and 0.4≦y≦0.5, and
Li1+y′Niz′M′1−z′O2−z″A′z″ Formula 2 wherein 0≦y′≦0.1, 0.5<z′≦0.9, and 0≦z″<0.2; M′ is at least one selected from the group consisting of elements stable for 6-coordination; and A′ is at least one monovalent or bivalent anion. |
