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Abstract: 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 VS4 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 VS4@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 VS4 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. [ABSTRACT FROM AUTHOR]

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., (© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)