Hierarchical SnO2/Carbon Nanofibrous Composite Derived from Cellulose Substance as Anode Material for Lithium-Ion Batteries

作者：Wang, Mengya; Li, Shun; Zhang, Yiming; Huang, Jianguo^*

来源：Chemistry - A European Journal, 2015, 21(45): 16195-16202.

DOI：10.1002/chem.201502833

• anodes
• biomimetic synthesis
• carbon
• thin films
• tin oxide

A hierarchical fibrous SnO2/carbon nanocomposite composed of fine SnO2 nanocrystallites immobilized as a thin layer on a carbon nanofiber surface was synthesized employing natural cellulose substance as both scaffold and carbon source. It was achieved by calcination/carbonization of the as-deposited SnO2-gel/cellulose hybrid in an argon atmosphere. As being employed as an anode material for lithium-ion batteries, the porous structures, small SnO2 crystallite sizes, and the carbon buffering matrix possessed by the nanocomposite facilitate the electrode-electrolyte contact, promote the electron transfer and Li+ diffusion, and relieve the severe volume change and aggregation of the active particles during the charge/discharge cycles. Hence, the nanocomposite showed high reversible capacity, significant cycling stability, and rate capability that are superior to the nanotubular SnO2 and SnO2 sol-gel powder counter materials. For such a composite with 27.8wt% SnO2 content and 346.4m(2)g(-1) specific surface area, a capacity of 623mAhg(-1) was delivered after 120 cycles at 0.2C. Further coating of the SnO2/carbon nanofibers with an additional carbon layer resulted in an improved cycling stability and rate performance.

• 出版日期2015-11-2
• 单位浙江大学; 浙江农林大学