Superior electrochemical performances of SnS-SnO2/NRGO heterostructures-based lithium anode with enhanced electric field effect

摘要

Inducing built-in charge transfer driving forces by constructing heteronanostructures resulted in the fascinating materials for next generation high speed electronics, optoelectronics and energy storage applications. Controllable syntheses of heteronanostructures with built-in charge transfer benefitted the specific charge transfer kinetics, thereby enhancing the electrochemical performances, when evaluated as an anode material for lithium-ion batteries (LIBs). In the present study, novel conversion type heteronanostructures consisting of p-type SnS and n-type SnO2 was successfully fabricated using graphene oxide templates, which ultimately caused the construction of SnS-SnO2/NRGO composites. The formation of the indigenous electric field in resultant composites facilitated the charge transfer kinetics, thereby boosted electrochemical properties. When used as an electrode material in lithiumion batteries (LIBs), synthesized composite materials deliver extraordinary specific capacity, long-term electrochemical cycling characteristics and outstanding rate capacity (1120 mAhg(-l) over 500 cycles measured @100 mAg(-1)).