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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Electrodeposition of NiS3S2/Ni Composites as High-Performance Cathodes for Lithium Batteries
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Electrodeposition of NiS3S2/Ni Composites as High-Performance Cathodes for Lithium Batteries

机译：NiS3S2 / Ni复合材料作为锂电池高性能阴极的电沉积

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摘要

An alternative electrodeposition technology, which provides an efficient way to complete a better interface contact between electroactive materials and metal foil substrates, was used to prepare Ni3S2/Ni composites in aqueous solutions contained thiourea (TU). The deposition parameters, such as time and TU concentration, were optimized. Surface morphology, chemical composition, and crystal structure of Ni3S2/Ni composites were analyzed using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD), respectively. A Ni3S2/Ni composite, which consisted of submicrometer grains with size in the range of 0.2-2 μm, was obtained. Galavostatic battery testing shows that the submicrometer Ni3S2/Ni4 composites as cathodes for lithium batteries exhibit a high specific capacity of 3.38 mAh g~(-1) at a current density of 0.17 A/g (~0.6 C), extraordinary capacity retention as well as 95.3% after 100 cycles, and outstanding rate performance, for example, still dclivcrmg 180 mAh g~(-1) at 1.7 A g~(-1) (~6 C). The performances may benefit from their miscellaneous submicrometer structures and subsequently formed tremella-like structures during discharge/charge cycles.
机译：另一种电沉积技术可提供一种有效的方法来完成电活性材料与金属箔基材之间的更好的界面接触，该技术用于在含硫脲（TU）的水溶液中制备Ni3S2 / Ni复合材料。优化了沉积参数，例如时间和TU浓度。分别使用扫描电子显微镜（SEM），能谱X射线能谱（EDX）和X射线衍射（XRD）分析了Ni3S2 / Ni复合材料的表面形态，化学成分和晶体结构。获得了由尺寸在0.2-2μm范围内的亚微米晶粒组成的Ni 3 S 2 / Ni复合材料。恒电池测试表明，作为锂电池阴极的亚微米Ni3S2 / Ni4复合材料在电流密度为0.17 A / g（〜0.6 C）时显示出3.38 mAh g〜（-1）的高比容量，以及出色的容量保持率在100次循环后，其电导率为95.3％，并具有出色的速率性能，例如，在1.7 A g〜（-1）（〜6 C）下仍保持180 mAh g〜（-1）。这些性能可受益于它们的其他亚微米结构以及随后在放电/充电周期中形成的银耳状结构。

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