Core-Shell Structured o-LiMnO2@Li2CO3 Nanosheet Array Cathode for High-Performance, Wide-Temperature-Tolerance Lithium-Ion Batteries.
To develop a high-capacity, high-rate, cycle-stable cathode material has long been the focus for lithium-ion battery (LIB) research. Recently, layer-structured orthorhombic-LiMnO2 (o-LMO) has attracted extensive interest owing to its large discharge capacities. However, poor cycle performance greatly hinders its practical application, especially at high temperatures. Conventional strategies to address this issue often lead to sacrificed rate performance and mostly work at low temperatures. Herein, we report a novel core-shell structured, o-LiMnO2@Li2CO3 (o-LMO@Li2CO3) nanosheet array cathode, where the Li2CO3 shell improves cycle performance by preventing o-LMO dissolution in the electrolyte (even at an elevated temperature), the o-LMO core provides high capacities and the nanosheet array architecture ensures rate performance (to the best of our knowledge, this o-LMO nanosheet array architecture is reported for the first time). The above features work synergistically to give well-balanced cycle performance (79% capacity retention at 60 °C, 400 cycles), capacity (207 mAh g(-1) at 0.5C) and rate performance (128 mAh g(-1) at 5C) of the o-LMO@ Li2CO3 cathode as well as remarkable full-cell performance (∼67% capacity retention for 400 cycles at ∼2C, 60 °C). Our work demonstrates that the synergistic effect between the o-LMO core, Li2CO3 coating and the nanoarray structure is an effective strategy for developing high-energy/power density, high-stability LIB cathodes.
State Key Laboratory of Fine Chemicals, School of Petroleum and Chemical Engineering, Dalian University of Technology , 2 Dagong Road, Liaodongwan New District, Panjin 124221, People's Republic of China.
Junling
J
Guo
Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences , Beijing 100190, People's Republic of China.
Yingjun
Y
Cai
Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences , Beijing 100190, People's Republic of China.
Suojiang
S
Zhang
Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences , Beijing 100190, People's Republic of China.
Shimou
S
Chen
State Key Laboratory of Fine Chemicals, School of Petroleum and Chemical Engineering, Dalian University of Technology , 2 Dagong Road, Liaodongwan New District, Panjin 124221, People's Republic of China.
Fengxiang
F
Zhang
Li2CO3; lithium-ion batteries; nanosheet array; orthorhombic-LiMnO2; synergistic effect