Preparation of Ni-Sn Alloy Nanorods with Composition Gradient, and Its Effect on Li-Ion Battery Anode Performance

摘要: The development of Li-ion batteries (LIBs) with high capacity, fast charge/discharge rates and long lifecycle is indispensable for the advancement of high power portable devices, plug-in hybrid and electric vehicles, and renewable energies. Novel anode materials that offer higher specific capacity than that of conventional carbon-based materials are considered a key factor in this development. Numerous Li-alloying materials are being investigated, but they experience large volume changes during the lithiation/delithiation process, leading directly to electrode degradation and short battery life. Tamura et al. have demonstrated that a concentration gradient at the interface between the active material and the current collector can enhance the interface strength and lead to longer lifecycle [1]. Our research involves investigating how this anode degradation may be avoided by creating a gradient of stress withinthe …