Four-layer tin-carbon nanotube yolk-shell materials for high-performance lithium-ion batteries

Abstract

All high-capacity anodes for lithium-ion (Li-ion) batteries, such as those based on tin (Sn) and silicon (Si), suffer from large volume changes during cycling with lithium ions, and their high capacities can be only achieved in the first few cycles. We design and synthesize a unique four-layer yolk-shell tin-carbon (Sn-C) nanotube array to address this problem. The shape and size of the exterior Sn nanotube@carbon core-shell layer, the encapsulated interior Sn nanowire@carbon nanotube core-shell layer, and the filling level of each layer can be all controlled by adjusting the experimental conditions. Such a nanostructure has not been reported for any metal or metal oxide-based material. Owing to the special design of the electrode structure, the four-layer hierarchical structure demonstrates excellent Li-ion storage properties in terms of high capacity, long cycle life, and high rate performance. Tinception: A four-layer yolk-shell tin-carbon (Sn-C) nanotube nanostructure for application in lithium-ion batteries is designed and successfully prepared by a SnO 2 nanotube-mediated method. The complex structure, designed to withstand the large volume changes associated with the use of tin anodes, offers excellent lithium-ion storage properties in terms of high capacity, long cycle life, and high rate performance. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.