Flexible additive-free CC@TiOxNy@SnS2 nanocomposites with excellent stability and superior rate capability for lithium-ion batteries

作者：Lu, Fengqi^*; Chen, Qiang; Wang, Yibin; Wu, Yonghao; Wei, Pengcheng; Kuang, Xiaojun

来源：RSC Advances, 2016, 6(29): 24366-24372.

DOI：10.1039/c5ra28090g

• HIGH-PERFORMANCE
• ENERGY-STORAGE
• ANODE MATERIAL
• SNS2 NANOSHEETS
• GRAPHENE NANOCOMPOSITES
• RECHARGEABLE BATTERIES
• VANADIUM NITRIDE
• NANOWIRE ARRAYS
• RECENT PROGRESS
• SURFACE

A novel material consisting of metal oxide-nitride (TiOxNy nanowires) and metal sulfide (SnS2 nanosheets) is synthesized on a flexible carbon cloth substrate by a two-step hydrothermal reaction. The as-synthesized carbon cloth/titanium oxynitride/tin disulfide (CC@TiOxNy@SnS2) nanocomposites are tested directly as additive-free anode materials for lithium-ion batteries. The free-standing CC@TiOxNy@SnS2 electrode displays an initial discharge capacity of 1082 mA h g(-1) at a current density of 1C, with a coulombic efficiency of 74%. The reversible capacity as high as 612 mA h g(-1) can still be maintained after 100 charging/discharging cycles. Moreover, this material shows outstanding rate properties with a high reversible discharge capacity of 419 mA h g(-1) at a current density of 5C, which is higher than the theoretical capacity of graphite. Also, a stable high discharge capacity of 676 mA h g(-1) can be attained when the current density is switched back to 1C. The high electrochemical performance can be attributed to the high electrical conductivity of the TiOxNy, which facilitates the transport of electrons and lithium ions, and the unique layer structure of SnS2.

• 出版日期2016
• 单位广西大学; 桂林理工大学