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Surface Coating Effect on Si Nanowires Anodes for Lithium Ion Batteries

Silicon based materials holds promise for next generation negative electrode for high-capacity Li-ion batteries, yet tremendous research effort have been made for tackling the chemo-mechanical failure that is associated with the intrinsic large volume change of Si during lithiation and delithiation process. Surface modification of Si nanostructures have successfully alleviated this problem and improved the cyclability of Si based anodes. Successful surface modifications are expected to provide both good protection and conduction between Si nanostructures without sacrificing the electrochemical performance. However, how these surface modifications will affect the lithiation and delithiation behavior of the Si nanostructures and whey they improve or deteriorate the performance of electrodes are largely unknown.