Cathode active material for lithium-ion battery, cathode for lithium-ion battery and lithium-ion battery
View Patent ↗A cathode active material for lithium-ion battery is provided, which provides good battery characteristics such as cycle characteristics. The cathode active material for lithium-ion battery is expressed by the composition formula: Li x Ni 1-y M y O α , wherein M is one or more selected from Ti, Cr, Mn, Fe, Co, Cu, Al, Sn, Mg and Zr; 0.9≦x≦1.2; 0<y≦0.5; and 2.0≦α≦2.2, wherein the crystallite size obtained by analyzing the XRD pattern is 870 Å or more and the unit lattice volume is 101.70 Å 3 or less.
1. A cathode active material for lithium-ion battery expressed by the composition formula:
Li x Ni 1-y M y O α ,
wherein M is any one of (1)-(3);
(1) Co and Mn;
(2) Co, Ti and Mg;
(3) Co and Al,
wherein 0.9≦x≦1.2; 0<y≦0.5; and 2.0≦α≦2.2,
wherein the crystallite size obtained by analyzing the XRD pattern and calculated using the Williamson-Hall method is 930 Å to 1100 Å and the unit lattice volume is 101.70 Å 3 or less.
2. A cathode for lithium-ion battery comprising a cathode active material for lithium-ion battery according to claim 1 .
3. A lithium-ion battery comprising a cathode for lithium-ion battery according to claim 2 .