Metal-organic framework-derived Nickel Diselenide grown in situ on carbon for high-performance Li storage

Abstract

The creation of innovative anodes to replace graphite in lithium-ion batteries (LIBs) is necessary to meet the rising demand for energy storage devices. Based on the large Li storage capacity, transition metal selenides (TMSs) draw considerable interest for LIBs. However, volume expansion of TMSs during the cycling process hinders their large-scale commercial application for LIBs. Herein, the NiSe2 particle grown in situ on the porous carbon framework (NiSe2@C) is prepared by selenization of metal-organic frameworks (MOFs) in an argon atmosphere. NiSe2@C exhibits a high reversible Li storage capacity (770 mAh g−1 at 200 mA g−1after 100 cycles), long cycling life (308 mAh g−1 at 1 A g−1 after 1000 cycles), and good rate capability (214 mAh g−1 at 5.0 A g−1). The long cycling performance can be attributed to the fact that NiSe2@C can withstand volume expansion during the Li+ insertion and desertion process. Furthermore, cyclic voltammetry (CV) tests at various scan rates are conducted to investigate the kinetics of NiSe2@C for LIBs, indicating that the Li storage behaviour of NiSe2@C is primarily controlled by the capacitive process. The fabrication of the TMS@C composites by selenization of MOFs is a potential way to obtain anodes for high-performance Li storage.