Hollow core-shell structured CNT/PAN@Co9S8@C coaxial nanocables as high-performance anode material for lithium ion batteries

Abstract Transition metal sulfides, which possesses high ionic conductivity and high theoretical capacity, have attracted tremendous interest in the field of lithium ion batteries (LIBs). However, their application suffers from severe volume changes and structure deterioration during charge-discharge process. Herein, hollow core-shell structured CNT/PAN@Co9S8@C coaxial nanocables were synthesized. The unique structure can provide more channels for Li+ ions/electrons diffusion and alleviate volume swelling during charge/discharge process. As a result, CNT/PAN@Co9S8@C exhibits good cycling performance (>700 mAh g−1 at 0.1 A g−1) and rate capability (455 mAh g−1 at 2 A g−1 after 100 cycles). The impressive results demonstrate CNT/PAN@Co9S8@C is a promising candidate for anode material in high-performance LIBs.