材料科学
石墨烯
电解质
化学工程
电化学
电极
纳米颗粒
纳米复合材料
纳米技术
化学
工程类
物理化学
作者
Qiang Pang,Yingying Zhao,Yanhao Yu,Xiaofei Bian,Xudong Wang,Yingjin Wei,Yu Gao,Gang Chen
出处
期刊:Chemsuschem
[Wiley]
日期:2018-02-05
卷期号:11 (4): 735-742
被引量:95
标识
DOI:10.1002/cssc.201702031
摘要
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.
科研通智能强力驱动
Strongly Powered by AbleSci AI