title: Hierarchical Nanocomposite of Hollow N-Doped Carbon Spheres Decorated with Ultrathin WS2 Nanosheets for High-Performance Lithium-Ion Battery Anode.
abstract: Hierarchical nanocomposite of ultrathin WS2 nanosheets uniformly attached on the surface of hollow nitrogen-doped carbon spheres (WS2@HNCSs) were successfully fabricated via a facile synthesis strategy. When evaluated as an anode material for LIBs, the hierarchical WS2@HNCSs exhibit a high specific capacity of 801.4 mA h g(-1) at 0.1 A g(-1), excellent rate capability (545.6 mA h g(-1) at a high current density of 2 A g(-1)), and great cycling stability with a capacity retention of 95.8% after 150 cycles at 0.5 A g(-1). The Li-ion storage properties of our WS2@HNCSs nanocomposite are much better than those of the previously most reported WS2-based anode materials. The impressive electrochemical performance is attributed to the robust nanostructure and the favorable synergistic effect between the ultrathin (3-5 layers) WS2 nanosheets and the highly conductive hollow N-doped carbon spheres. The hierarchical hybrid can simultaneously facilitate fast electron/ion transfer, effectively accommodate mechanical stress from cycling, restrain agglomeration, and enable full utilization of the active materials. These characteristics make WS2@HNCSs a promising anode material for high-performance LIBs.
authors.affiliation: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, China.
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Zeng
authors.affiliation: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, China.
authors.forename: Zhengping
authors.initials: Z
authors.lastname: Ding
authors.affiliation: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, China.
authors.forename: Cheng
authors.initials: C
authors.lastname: Ma
authors.affiliation: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, China.
authors.forename: Laidi
authors.initials: L
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, China.
authors.forename: Jiatu
authors.initials: J
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, China.
authors.forename: Libao
authors.initials: L
authors.lastname: Chen
authors.affiliation: Department of Chemical and Materials Engineering, University of Alberta, Edmonton , Alberta T6G 1H9, Canada.
authors.forename: Douglas G
authors.initials: DG
authors.lastname: Ivey
authors.affiliation: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, China.
authors.forename: Weifeng
authors.initials: W
authors.lastname: Wei
keywords: WS2; hierarchical structure; hollow conductive material; lithium-ion storage; synergistic effect