Cathode for secondary battery
View Patent ↗Disclosed is a cathode for secondary batteries comprising a compound having a transition metal layer containing lithium as at least one compound selected from the following formula 1: (1−x)Li(Li y M 1-y-z Ma z )O 2-b A b *xLi 3 PO 4 (1) wherein M is an element stable for a six-coordination structure, which is at least one selected from transition metals that belong to first and second period elements; Ma is a metal or non-metal element stable for a six-coordination structure; A is at least one selected from the group consisting of halogen, sulfur, chalcogenide compounds and nitrogen; 0<x<0.1; 0<y<0.3; 0≦z<0.2; and 0≦b<0.1.
1. A cathode for secondary batteries comprising a compound having a transition metal layer containing lithium as at least one compound selected from the following formula 1:
(1−x)Li(Li y M 1-y-z Ma z )O 2-b A b *xLi 3 PO 4 formula (1)
wherein M has a composition of the following formula 2:
Ni a Mn b Co c formula (2),
Ma is a metal or non-metal element stable for a six-coordination structure;
A is at least one selected from the group consisting of halogen, sulfur, chalcogenide compounds and nitrogen;
0<x<0.1;
0<y<0.3;
0≦z<0.2;
0≦b<0.1;
0.10<a<0.85;
0.10<b<0.85;
0<c<0.5;
and
b>c.
2. The cathode for secondary batteries according to claim 1 , wherein x satisfies the condition of 0<x≦0.05.
3. The cathode for secondary batteries according to claim 1 , wherein y satisfies the condition of 0.01≦y≦0.2.
4. A lithium secondary battery comprising the cathode according to claim 1 .
5. A middle or large battery pack comprising the lithium secondary battery according to claim 4 as a unit battery.