Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6602895 | Electrochimica Acta | 2018 | 28 Pages |
Abstract
This work provides a new strategy for using the combined effect of coating-CaF2 and La-doping to improve the electrochemical performance of lithium-rich layer material. Here, La-doping in metal transition(MT) layer is employed to block the migration channel of TM ions and stabilize the crystal structure, and coating-CaF2 on the surface of lithium-rich layer oxide material is employed to retard the side reaction between active material and electrolyte. Benefiting from the combined effect of coating-CaF2 and La-doping, CaF2 coated Li1.2Mn0.52Ni0.13Co0.13La0.02O2 exhibits excellent cycling performance and voltage stability. CaF2 coated Li1.2Mn0.52Ni0.13Co0.13La0.02O2 delivers the initial discharge capacity of 227.1â¯mAh gâ1 at 0.5â¯C. After 100 cycles, its retention of discharge capacity is 93.9%, and its voltage decay is only 0.203â¯V. This connecting mechanism of coating and doping, which can avoid the insufficient of single coating or single doping, is very helpful to develop effective strategies for the modification of Li-rich oxide materials.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Min Li, Yi Zhou, Xiaoyan Wu, Lei Duan, Chunming Zhang, Fang Zhang, Dannong He,