Co_(0.85)Se Nanosheets/Grapfaene Composite Film as Binder-free Anode for Lithium-ion Batteries

摘要

Nowadays,developing flexible energy storage devices such as flexible lithium ion batteries(LIBs)with high performance are urgently needed in the next generation,flexible and wearable electronic devices1’2.Transitional metal selenides(TMSs)have attracted interest as anode materials for lithium-ion batteries(LIBs)due to their high capacities,thermal and chemical stability.Cobalt selenide,as one of most important TMSs,has been investigated as anode materials for LIBs.However,cobalt selenide anodes possess some drawbacks such as large volume expansion during the lithiation/delithiation process and poor cycle stability.Graphene has attracted significant attention in flexible electrodes field due to its unique structure,high electrical conductivity and excellent mechanical properties3,4.Here,flexible free-standing Co_(0.85)Se nanosheets(NSs)/graphene composite film was prepared as anode of LIBs with excellent electrochemical performances.