Natural-Cellulose-Derived Tin-Nanoparticle/Carbon-Nanofiber Composite as Anodic Material in Lithium-Ion Batteries

摘要

A series of tin-nanoparticle/carbon-nanofiber composites with varied tin content were synthesized by employing natural cellulose (e.g., ordinary laboratory filter paper) as both the structural scaffold and carbon source. The nanocomposites were obtained through hydrogen reduction of nanofibrous tin-oxide/carbon hybrids that were prepared by a self-assembly technique based on the surface sol–gel process. The nanocomposite with 16 wt% tin content was composed of fine metallic tin nanocrystallites with sizes of 20– 50 nm that were uniformly immobilized on the surface of the cellulose-derived carbon nanofibers. When employed as an anodic material for lithium-ion batteries, because of its unique three-dimensionally hierarchical porous structures and the buffering effect of the carbon matrix, it showed a stable discharge capacity of ca. 430 mAhg@1 after 200 charge/discharge cycles at a current density of 100 mAg@1, which was close to the calculated theoretical capacity of the electrode. In addition, its structural stability upon extensive charge/discharge cycling processes is outstanding.