Synthesis and electrochemical properties of tin-doped MoS2 (Sn/MoS2) composites for lithium ion battery applications

摘要

SnO2-MoO3 composites were synthesized by using (NH4)(6)Mo7O24 center dot 4H(2)O and SnCl2 center dot 2H(2)O as raw materials through a simple solvothermal method followed by pyrolysis. Tin-doped MoS2 (Sn/MoS2) flowers have been synthesized by a solvothermal method followed with annealing in Ar(H-2) atmosphere, with SnO2-MoO3, thioacetamide (TAA), and urea as starting materials. The doping and the content of Sn-doping play crucial roles in the morphology and electrochemical performance of the MoS2. As anode materials for lithium ion battery (LIB), all Sn/MoS2 composites exhibit both higher reversible capacity and better cycling performance at current density of 200 mA g(-1), compared with MoS2 without Sn doping. The achieved discharge capacity for Sn/MoS2 composites is above 1000mAh g(-1) after 100 cycles with nearly 100 coulombic efficiency. The doping of metal Sn in MoS2 can improve the conductivity of MoS2 and significantly enhance its electrochemical properties. The good electrochemical performance suggests that the Sn/MoS2 composite could be a promising candidate as a novel anode material for LIB application. Our present work provides a new approach to the fabrication of anode materials for LIB applications.