Flower-like NiS/C as high-performance anode material for sodium-ion batteries

Flower-like NiS/C as high-performance anode material for sodium-ion batteries
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花状NiS/C作为高性能钠离子电池负极材料

DOI:
10.1007/s11581-020-03818-9
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发表时间:
2020-10
期刊:
影响因子:
2.8
通讯作者:
Zhang Yingjie
Zhang Yingjie
中科院分区:
化学4区
文献类型:
--
作者:
Xia Guanghui;Li Xuebao;Gu Yang;Dong Peng;Zhang Yiyong;Duan Jianguo;Wang Ding;Zhang Yingjie

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过渡金属硫化物是高容量钠离子电池极具发展前景的负极材料。然而,电导率差和体积膨胀大的缺陷仍然限制了它们的应用。本文采用葡萄糖辅助水热法结合后退火策略,成功合成了具有均匀花状结构的NiS/C。花瓣状结构缩短了钠离子在电化学反应中的扩散路径。值得注意的是,形成的均匀非晶碳在提高电极材料的导电性和缓冲快速体积变化方面更有效。当作为sib的阳极时,NiS/C电极在0.1 a g−1时可提供1042.3 mAh g−1的高可逆比容量。优异的电化学性能表明,NiS/C在未来大规模储能金属硫化物电极的开发和研究中具有很大的潜力。
Transition metal sulfides are the promising anode materials for high-capacity sodium-ion batteries (SIBs). However, the pitfalls of poor conductivity and large volume expansion still restrict their applications. Herein, NiS/C with a uniform flower-like structure was successfully synthesized via a glucose-assisted hydrothermal method coupled with post-annealing strategy. The petal-shaped configuration shortens the diffusion path of sodium ions in electrochemical reaction. Significantly, the formed uniform amorphous carbon is more effective in improving the electrical conductivity of electrode materials and buffering for the rapid volume change. When regarded as the anode of SIBs, the NiS/C electrode delivers a high reversible specific capacity of 1042.3 mAh g−1at 0.1 A g−1. The excellent electrochemical performance shows that the NiS/C offers great potential for the development and research of large-scale energy storage of metal sulfide electrodes in the future.
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