Formation of Porous Cu‐Doped CoSe₂ Connected by Nanoparticles for Efficient Lithium Storage

Abstract

Abstract A porous structure is widely considered as an efficient way to improve lithium storage performance. In this paper, a novel porous Cu‐doped CoSe 2 product is prepared by annealing a ZIF‐67 precursor and Se powder. This Cu‐doped CoSe 2 sample is composed of interconnected nanoparticles. The average particle size of the nanoparticles is around 80 nm. When evaluated as anode materials for lithium‐ion batteries, this porous structure could effectively shorten the charge‐transport path and accommodate volume expansion during charge/discharge cycling. Therefore, porous Cu‐doped CoSe 2 manifests both a superior rate capacity of about 747 mAh/g at 5 A/g and a stable cycling capacity of about 807 mAh/g for 200 cycles.