Scalable 2D Mesoporous Silicon Nanosheets for High-Performance Lithium-Ion Battery Anode

作者：Chen, Song; Chen, Zhuo^*; Xu, Xingyan; Cao, Chuanbao^*; Xia, Min^*; Luo, Yunjun

来源：Small, 2018, 14(12): 1703361.

DOI：10.1002/smll.201703361

• 2D
• electrochemical properties
• lithium-ion batteries
• mesoporous
• Si nanosheets

Constructing unique mesoporous 2D Si nanostructures to shorten the lithium-ion diffusion pathway, facilitate interfacial charge transfer, and enlarge the electrode-electrolyte interface offers exciting opportunities in future high-performance lithium-ion batteries. However, simultaneous realization of 2D and mesoporous structures for Si material is quite difficult due to its non-van der Waals structure. Here, the coexistence of both mesoporous and 2D ultrathin nanosheets in the Si anodes and considerably high surface area (381.6 m(2) g(-1)) are successfully achieved by a scalable and cost-efficient method. After being encapsulated with the homogeneous carbon layer, the Si/C nanocomposite anodes achieve outstanding reversible capacity, high cycle stability, and excellent rate capability. In particular, the reversible capacity reaches 1072.2 mA h g(-1) at 4 A g(-1) even after 500 cycles. The obvious enhancements can be attributed to the synergistic effect between the unique 2D mesoporous nanostructure and carbon capsulation. Furthermore, full-cell evaluations indicate that the unique Si/C nanostructures have a great potential in the next-generation lithium-ion battery. These findings not only greatly improve the electrochemical performances of Si anode, but also shine some light on designing the unique nanomaterials for various energy devices.

• 出版日期2018-3-22
• 单位北京理工大学