SCHEDULED MAINTENANCE
A strategy for suitable mass production of a hollow Si@C nanostructured anode for lithium ion batteries
Abstract
Si with high theoretical capacity has long suffered from its large volume variation and low electrical transport linked to poor cycling stability and rate performance. Here, a facile approach is reported to mass produce nanostructured Si@carbon with a tunable size of silicon nanoparticles. We performed carbon coating of Si nanoparticles by polyacrylonitrile (PAN) emulsifying and then carbonization. The hollow Si@C nanostructure was obtained via direct etching of Si nanoparticles with HF solution which is more advanced and has better controllability. When evaluated as an anode material for lithium-ion batteries, the C–Si nanocomposites exhibit excellent reversibility and cycling performance. A high capacity of 700 mA h g−1 can be retained after 100 cycles at current densities of 250 mA g−1. The rate capability of the C–Si microfibers is also improved. The special structure is believed to offer better structural stability upon prolonged cycling and to improve the conductivity of the material. This simple strategy could also be applied to prepare other carbon coatings of hollow energy materials.
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