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

A porous structure is widely considered as an efficient way to improve lithium storage performance. In this paper, a novel porous Cu-doped CoSe₂ product is prepared by annealing a ZIF-67 precursor and Se powder. This Cu-doped CoSe₂ 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 CoSe₂ 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. [ABSTRACT FROM AUTHOR]