Confinement Growth of Layered WS2 in Hollow Beaded Carbon Nanofibers with Synergistic Anchoring Effect to Reinforce Li+/Na+ Storage Performance

Tungsten disulfide (WS2) nanosheets are anchored on the surface and inside of hollow beaded carbon nanofibers (HB CNFs) via a confined growth strategy to construct hierarchical structure HB WS2@CNFs. The conversion mechanism of Li+/Na+ storage is analyzed by an ex situ method. This special structure can effectively restrain the volume effect and improve the storage performance of lithium ‐ion batteries and sodium‐ion batteries. AbstractNovel 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 m...

Source: Small - July 1, 2020 Category: Nanotechnology Authors: Huayu Wu, Xing Chen, Chen Qian, Hui Yan, Chenyi Yan, Nuo Xu, Yuanzhe Piao, Guowang Diao, Ming Chen Tags: Full Paper Source Type: research