Hierarchical N‐Doped HMCN/CNT Hybrid Carbon Frameworks Assembling Cobalt Selenide Nanoparticles for Advanced Properties of Lithium/Sodium Storage

Abstract

AbstractA hybrid nanostructure with Co0.85Se nanoparticles anchored in nitrogen‐doped hollow mesoporous carbon nanospheres/carbon nanotubes (Co0.85Se/N‐HMCNs/CNTs) is elaborately fabricated by a pyrolysis–reduction–selenization strategy derived from yolk–shell zeolitic imidazolate framework‐67 (ZIF‐67)@HMCNs, which are synthesized by the confined growth of ZIF‐67 inside HMCNs regarded as nanoreactors. Benefitting from the robust hollow carbon frameworks made of nitrogen‐doped hollow mesoporous carbon nanospheres, carbon nanotubes, and highly active Co0.85Se ultrafine nanoparticles, the as‐prepared nanocomposites show greatly enhanced lithium/sodium storage properties. When the Co0.85Se/N‐HMCNs/CNTs are applied to lithium‐ion batteries as anode materials, the advanced nanocomposite delivers excellent cycling stability (286 and 153 mA h g−1at 10 A g−1after 5000 and 10 000 cycles) and high rate performance (501 mA h g−1at 5 A g−1). When the Co0.85Se/N‐HMCNs/CNTs are applied to sodium‐ion batteries as anode materials, the material realizes better cycling performance (102 mA h g−1at 1 A g−1after 1000 cycles) and excellent rate performance (132 mA h g−1at 5 A g−1).