A team at Tsinghua University in China has developed a film of porous carbon nanofibers containing Sn/SnOx nanoparticles in the pores for use as an anode material in Li-ion batteries. The film, which can be used as an electrode directly without any binder or conductive filter, showed good electrical performance of 735 and 510 mAh g-1 in the 1st and 40th cycles, respectively.
A paper on the work is in press in the journal Carbon.
The team prepared the material via an electrospinning process. The pores in the fibers and the abundant spaces between the fibers not only offer more interface for the reaction of the film and lithium ions, but also buffer the volumetric change of the whole film during cycling.
The size of the particles encapsulated in the pores is smaller than the volume of the pores, thus providing buffering spaces for the volumetric change of tin during cycling.
Lin Zou, Lin Gan, Ruitao Lv, Mingxi Wang, Zheng-hong Huang, Feiyu Kang, and Wanci Shen (2010) A film of porous carbon nanofibers that contain Sn/SnOx nanoparticles in the pores and its electrochemical performance as an anode material for lithium ion batteries. Carbon Article in Press doi: 10.1016/j.carbon.2010.08.046