Abstract
Cobalt selenide(CoSe2)has garnered consid-erable attention as a prospective anode candidate for advanced lithium-ion storage,prompting comprehensive investigations.However,CoSe2-based anodes usually suf-fer from significant volume variation upon lithiation,leading to unsatisfactory cycling stability.Herein,a ver-satile synthesis route is proposed for the in-situ fabrication of CoSe2 nanoparticles embedded in N-dope carbon skeleton(CoSe2@NC)through annealing treatment and selenization of a metal-organic framework-derived(MOF)precursor.The N-doped carbon derived from the MOF serves not only as an excellent conductive substrate but also as a confined reactor,effectively inhibiting the struc-tural instability and alleviating the inevitable volume change of CoSe2.Owing to their unique nanostructure,the as-prepared CoSe2@NC exhibits a high capacity of 745.9 mAh·g-1 at 0.1 A·g-1,while maintaining excellent rate capability and an impressive lifespan.Furthermore,the assembled lithium-ion capacitor(LIC)based on CoSe2@NC demonstrates an energy density of 130 Wh·kg-1,a power density of 24.6 kW.kg-1,and remark-able capacity retention of 90.8％after 8000 cycles.These results highlight the great potential of CoSe2@NC for practical applications.
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