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VS 4 Nanoparticles Anchored on Graphene Sheets as a High‐Rate and Stable Electrode Material for Sodium Ion Batteries
Author(s) -
Pang Qiang,
Zhao Yingying,
Yu Yanhao,
Bian Xiaofei,
Wang Xudong,
Wei Yingjin,
Gao Yu,
Chen Gang
Publication year - 2018
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201702031
Subject(s) - graphene , materials science , electrolyte , electrochemistry , chemical engineering , electrode , nanoparticle , nanocomposite , nanotechnology , chemistry , engineering
The size and conductivity of the electrode materials play a significant role in the kinetics of sodium‐ion batteries. Various characterizations reveal that size‐controllable VS 4 nanoparticles can be successfully anchored on the surface of graphene sheets (GSs) by a simple cationic‐surfactant‐assisted hydrothermal method. When used as an electrode material for sodium‐ion batteries, these VS 4 @GS nanocomposites show large specific capacity (349.1 mAh g −1 after 100 cycles), excellent long‐term stability (84 % capacity retention after 1200 cycles), and high rate capability (188.1 mAh g −1 at 4000 mA g −1 ). A large proportion of the capacity was contributed by capacitive processes. This remarkable electrochemical performance was attributed to synergistic interactions between nanosized VS 4 particles and a highly conductive graphene network, which provided short diffusion pathways for Na + ions and large contact areas between the electrolyte and electrode, resulting in considerably improved electrochemical kinetic properties.