Hierarchically Interconnected Ni3S2 Nanofibers as Binder-Free Electrodes for High-Performance Sodium-Ion Energy-Storage Devices
Hierarchically Interconnected Ni3S2 Nanofibers as Binder-Free Electrodes for High-Performance Sodium-Ion Energy-Storage Devices
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DOI：
10.1021/acsanm.8b02341
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发表时间：
2019-02
影响因子：
5.9
通讯作者：
Maocheng Liu;Jun Li;Qinggang Yang;Yan Xu;L. Kong;Rui-Juan Bai;Wen‐Wu Liu;Wenke Niu;Y. Chueh
中科院分区：
文献类型：
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作者：
Maocheng Liu;Jun Li;Qinggang Yang;Yan Xu;L. Kong;Rui-Juan Bai;Wen‐Wu Liu;Wenke Niu;Y. Chueh
采用一步水热法在泡沫镍上直接生长出了具有层次结构的Ni 3S 2纳米纤维，并将其用作高性能钠离子电池的无粘结剂电极。分级互连的Ni 3S 2纳米纤维可以有效地缓解Ni 3S 2的体积膨胀并缩短Na+离子的扩散路径，这可以增强电化学反应期间的高电子电导率，产生高比电容、优异的循环稳定性和优异的倍率性能。结果表明，在第一次钠化过程中，在0.2 A g-1的电流密度下，可以实现584.2 mAh g-1的高放电比容量，100次循环后的容量保持率为91.9%（保持536.9 mAh g-1）。基于分级互连的Ni 3S 2纳米纤维作为无粘合剂阳极材料和活性炭作为阴极材料的不对称Na+离子电容器表现出高能量和功率密度。有趣的是，转化反应是...
Direct growth of hierarchically interconnected Ni3S2 nanofibers as binder-free electrodes for high-performance sodium (Na+)-ion batteries was demonstrated by a facile one-step hydrothermal method on a nickel (Ni) foam. The hierarchically interconnected Ni3S2 nanofibers can effectively relieve volume expansion of Ni3S2 and shorten diffusion paths of Na+ ions that can enhance the high electronic conductivity during the electrochemical reaction, yielding high specific capacitance, excellent cycling stability, and outstanding rate capability. As a result, a high discharge specific capacity of 584.2 mAh g–1 at a current density of 0.2 A g–1 in the first sodiation process with a capacity retention of 91.9% after 100 cycles (retains 536.9 mAh g–1) can be achieved. The asymmetric Na+-ion capacitor based on the hierarchically interconnected Ni3S2 nanofibers as binder-free anode materials and the activated carbon as a cathode material exhibits high energy and power density. Interestingly, the conversion reaction me...