SnO@amorphous TiO2core-shell composite for advanced lithium storage

Abstract

Abstract Tin monoxide(SnO) has been considered as a promising candidate for the next-generation lithium storage due to its exceptional specific capacity and unique layered structure. However, the huge volume change of SnO during lithiation/delithiation process tends to cause various mechanical failure problems including the delamination between the current collector and the electrode materials, leading to poor stability of the lithium-ion batteries. Herein we propose to solve the interfacial delamination problem by encapsulating the SnO microspheres in amorphous TiO 2 . The prepared SnO@amorphous TiO 2 core-shell composite is found quite successful in alleviating the interfacial delamination, resulting in higher capacity retention and faster solid-state ion diffusion. Specifically, the SnO@amorphous TiO 2 core-shell composites electrode shows a stable charge capacity of 253.6 mAh g -1 after 200 cycles, which is much higher than that of the pure SnO electrode (141.1 mAh g -1 ). Our work provides a guideline for the design and manufacture of the SnO-based electrodes for LIBs.