Encapsulation of CoS _x Nanocrystals into N/S Co-Doped Honeycomb-Like 3D Porous Carbon for High-Performance Lithium Storage.

ABSTRACT: A honeycomb-like 3D N/S co-doped porous carbon-coated cobalt sulfide (CoS, Co₉S₈, and Co_1-x S) composite (CS@PC) is successfully prepared using polyacrylonitrile (PAN) as the nitrogen-containing carbon source through a facile solvothermal method and subsequent in situ conversion. As an anode for lithium-ion batteries (LIBs), the CS@PC composite exhibits excellent electrochemical performance, including high reversible capacity, good rate capability, and cyclic stability. The composite electrode delivers specific capacities of 781.2 and 466.0 mAh g^-1 at 0.1 and 5 A g^-1, respectively. When cycled at a current density of 1 A g^-1, it displays a high reversible capacity of 717.0 mAh g^-1 after 500 cycles. The ability to provide this level of performance is attributed to the unique 3D multi-level porous architecture with large electrode-electrolyte contact area, bicontinuous electron/ion transport pathways, and attractive structure stability. Such micro-/nanoscale design and engineering strategies may also be used to explore other nanocomposites to boost their energy storage performance.

SUBMITTER: Yin B 

PROVIDER: S-EPMC6145217 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature