Layered lithium nickel-
Rich oxide Li [ni 1-mx] O2 (M = metal) has aroused great interest as cathode material for rechargeable lithium batteries due to its high capacity, excellent rate capability and low cost, 2,3, 4,5, 6, 7.
However, their low heat
Abuse tolerance and poor cycle life, especially at high temperatures, is prohibited from being used in actual batteries4, 5,6.
Here we report a concentration-
Rechargeable lithium battery gradient cathode material based on layered lithium nickel cobalt manganese oxide.
In this material, each particle has a central volume rich in Ni and Mn
With the decrease of Ni concentration and the increase of Mn and Co concentration, the outer layer is abundant as the surface approaches.
The former provides large capacity and the latter improves thermal stability.
Half a cell with our concentration.
The gradient cathode material reaches a large capacity of 209 mama hh 1g-1 and retains a capacity of 96% after 50 charge and discharge cycles under a positive test profile (55 FOMC0 and 4. 4u2009V).
Our focus.
Gradient Material in heat-
The abuse test is compared to the bulk component Li [ni0. 8Co0. 1Mn0.
1] O2 as a reference.
These results show that our cathode materials can produce batteries that meet plug performance and safety requirements
Hybrid electric vehicles.