Strong Coupling of MoS2 Nanosheets and Nitrogen‐Doped Graphene for High‐Performance Pseudocapacitance Lithium Storage

• DOI: 10.1002/smll.201704410
• Publication Date: 2018-05-24T06:51:12Z
• Authors: Zhendong Lei; Laiqiang Xu; Yalong Jiao; Aijun Du; Yong Zhang; Haijiao Zhang
• Keywords: Pseudocapacitance

Layered material MoS2 is widely applied as a promising anode for lithium-ion batteries (LIBs). Herein, scalable and facile dopamine-assisted hydrothermal technique the preparation of strongly coupled nanosheets nitrogen-doped graphene (MoS2 /N-G) composite developed. In this composite, interconnected are well wrapped onto surface graphene, forming unique veil-like architecture. Experimental results indicate that dopamine plays multiple roles in synthesis: binding agent to anchor uniformly disperse nanosheets, morphology promoter, precursor situ nitrogen doping during self-polymerization process. Density functional theory calculations further reveal strong interaction exists at interface which facilitates charge transfer hybrid system. When used LIBs, resulting /N-G electrode exhibits much higher more stable Li-ion storage capacity (e.g., 1102 mAh g-1 100 mA ) than /G without employing linker. Significantly, it also identified thin display outstanding high-rate capability due surface-dominated pseudocapacitance contribution.