“…However, the current specific capacity of graphite is basically close to its theoretical limit, which can hardly meet the increasing requirement of various energy storage devices. 5 Transition metal selenides (TMSes) such as FeSe 2 , 6,7 CoSe 2 , 8,9 NiSe 2 , 10–12 and Cu 2 Se 13 have become outstanding anode candidates due to their characteristic physical and chemical properties, such as large interlayer distances, high theoretical specific capacities, low cost, and eco-friendliness. 14–16 In addition, their weak metal-Se covalent bonds are convenient for the intercalation and deintercalation of lithium ions.…”