V3S4 Nanosheets Anchored on N S Co-Doped Graphene with Pseudocapacitive Effect for Fast and Durable Lithium Storage

摘要

Construction of a suitable hybrid structure has been considered an important approach to address the defects of metal sulfide anode materials. V S nanosheets anchored on an N, S co-coped graphene (VS/NSG) aerogel were successfully fabricated by an efficient self-assembled strategy. During the heat treatment process, decomposition, sulfuration and N, S co-doping occurred. This hybrid structure was not only endowed with an enhanced capability to buffer the volume expansion, but also improved electron conductivity as a result of the conductive network that had been constructed. The dominating pseudocapacitive contribution (57.78% at 1 mV s ) enhanced the electrochemical performance effectively. When serving as anode material for lithium ion batteries, VS/NSG exhibits excellent lithium storage properties, including high rate capacity (480 and 330 mAh g at 5 and 10 A g , respectively) and stable cyclic performance (692 mAh g after 400 cycles at 2 A g ).