V<sub>3</sub>S<sub>4</sub> Nanosheets Anchored on N, S Co-Doped Graphene with Pseudocapacitive Effect for Fast and Durable Lithium Storage

oleh: Naiteng Wu, Di Miao, Xinliang Zhou, Lilei Zhang, Guilong Liu, Donglei Guo, Xianming Liu

Format: Article
Diterbitkan: MDPI AG 2019-11-01

Deskripsi

Construction of a suitable hybrid structure has been considered an important approach to address the defects of metal sulfide anode materials. V<sub>3</sub>S<sub>4</sub> 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<sup>&#8722;1</sup>) 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<sup>&#8722;1</sup> at 5 and 10 A g<sup>&#8722;1</sup>, respectively) and stable cyclic performance (692 mAh g<sup>&#8722;1</sup> after 400 cycles at 2 A g<sup>&#8722;1</sup>).