Abstract
Novel nitrogen doped (N-doped) hollow beaded structural composite carbon nanofibers are successfully applied for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). Tungsten disulfide (WS2 ) nanosheets are confined, through synergistic anchoring, on the surface and inside of hollow beaded carbon nanofibers (HB CNFs) via a hydrothermal reaction method to construct the hierarchical structure HB WS2 @CNFs. Benefiting from this unique advantage, HB WS2 @CNFs exhibits remarkable lithium-storage performance in terms of high rate capability (≈351 mAh g-1 at 2 A g-1 ) and stable long-term cycle (≈446 mAh g-1 at 1 A g-1 after 100 cycles). Moreover, as an anode material for SIBs, HB WS2 @CNFs obtains excellent long cycle life and rate performance. During the charging/discharging process, the evolution of morphology and composition of the composite are analyzed by a set of ex situ methods. This synergistic anchoring effect between WS2 nanosheets and HB CNFs is capable of effectively restraining volume expansion from the metal ions intercalation/deintercalation process and improving the cycling stability and rate performance in LIBs and SIBs.
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