| 摘要 |
Disclosed is cathode active material 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<z′≦0.5, 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.;Disclosed is also a secondary battery comprising the cathode active material. |
| 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 4, the cathode active material having a broad potential region (potential plateau) at 3.0 to 4.8V upon initial charge, and wherein the oxide of Formula 3 is mixed with the oxide of Formula 4 in a weight ratio of 80:20 to 90:10:
LixNiyMn2−yO4 Formula 3 wherein 0.9≦x≦1.2, and 0.4≦y≦0.5
LiNiaMnbCocO2 Formula 4 wherein 0<a≦0.5, 0<b≦0.5, 0<c≦⅓, a+b+c=1, and −0.2≦a−b≦0.2. |
