Nanobelts-constructed Porous TiO2-B@SnS2 Heterostructure Hybrids for Enhance Lithium Storage Performance

Abstract

Alloy-type anodes materials possess broad prospects for excellent electrochemical property lithium-ion batteries owing to its high theoretical capacity and excellent electronic conductivity. However, this type electrode materials experience poor kinetics and tremendous volume collapse during the repeated lithiation-delithiation process. Herein, an efficient method to provide a fast transmission channel and suppress the volume collapse during the discharge/charge process by constructing the heterostructure between porous TiO2-B nanoblets and few-layer SnS2 nanosheets interface, which provides high-active sites for the nucleation and growth of SnS2 nanosheets, and inhibits the agglomeration of SnS2 nanosheets. Both experimental results and theoretical calculations definite that porous TiO2 nanobelts provides more chemical active sites for the adsorption and transmission of lithium ion and then effectively improve the stability the electrode structure. As a result, TiO2-B@SnS2 hybrid exhibits excellent rate and cycle performance. This work paves a way to design and construction of high performance alloy-type anode materials.