Controllable MOF-Derived Hierarchical Hollow CoNiSe<sub>2</sub> with Enhanced Mechanics and Kinetics for Extraordinary Rate Performance and Durable Anode of Sodium-Ion Batteries
Peng Zhou, Liping Wang, Mingyu Zhang, Feixiang Wu, Qizhong Huang, Zhean Su, Ping Xu, Mingdong Liao, Yueli Hu, Xiangbao Lin
Abstract
High rates and durable anodes are the eternal pursuits of sodium ion batteries (SIBs). Constructing bimetal selenide is an efficient strategy to improve Na + storage. Herein, a hierarchical hollow CoNiSe 2 /carbon compound (CoNiSe 2 /C) was designed as an anode of SIBs via selenizing the modified MOFs precursor. During the high-rate test, CoNiSe 2 /C electrodes exhibited an outstanding specific capacity of 301.9 mA h g –1 even at 20 A g –1, while an impressive cycle life over 2000 at 5 A g –1 was achieved with a residual capacity of 368.9 mA h g –1 . The high-rate capability is attributed to the significantly reduced energy barrier of reaction activation and the strong microstructure of the hierarchical hollow CoNiSe 2 /C. It indicates that the CoNiSe 2 /C synthesized in this work is highly desirable and promising as a SIB anode material and sheds light on the design and development of anode materials.