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

• Main Authors: Naiteng Wu, Di Miao, Xinliang Zhou, Lilei Zhang, Guilong Liu, Donglei Guo, Xianming Liu
• Format: Article
• Language: English
• Published: MDPI AG 2019-11-01
• Series: Nanomaterials
• Subjects: v₃s₄ nanosheets; pseudocapacitive; n, s co-doped graphene; lithium ion batteries
• Online Access: https://www.mdpi.com/2079-4991/9/11/1638

Construction of a suitable hybrid structure has been considered an important approach to address the defects of metal sulfide anode materials. V₃S₄ 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^−1) 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^−1 at 5 and 10 A g^−1, respectively) and stable cyclic performance (692 mAh g^−1 after 400 cycles at 2 A g^−1).