Hierarchical Nanocomposite of Hollow N-Doped Carbon Spheres Decorated with Ultrathin WS2 Nanosheets for High-Performance Lithium-Ion Battery Anode

详细信息    查看全文

• 作者：Xiaohui Zeng ; Zhengping Ding ; Cheng Ma ; Laidi Wu ; Jiatu Liu ; Libao Chen ; Douglas G. Ivey ; Weifeng Wei
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：July 27, 2016
• 年：2016
• 卷：8
• 期：29
• 页码：18841-18848
• 全文大小：543K
• 年卷期：0
• ISSN：1944-8252

文摘

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.