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Material Sciences 2025
镍/二氧化钛/碳纳米管异质结构及其在锂硫电池中的应用
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Abstract:
锂硫电池因其高理论能量密度和低成本被广泛关注，然而多硫化物穿梭效应造成电池的电化学性能降低。二氧化钛因其具有良好的光催化活性和电化学催化性能，可以促进电极表面的化学反应和电化学反应，从而优化电极结构，另外二氧化钛对多硫化物具有一定吸附催化转化效果。因此，本文通过化学气相沉积法制备含镍/二氧化钛/碳纳米管异质结构催化剂，并通过XRD，扫描电镜，透射电镜和EDS分析了催化剂成分，结构及微观组织，并进行电化学性能测试。结果表明在700℃下的催化剂很好地提高锂硫电池电化学性能。本文的研究结果为锂硫电池抑制多硫化物穿梭效应的催化剂的研究提供参考。
Lithium-sulfur batteries have attracted extensive attention due to their high theoretical energy density and low cost, but the polysulfide shuttle effect reduces the electrochemical performance of the battery. Because of its good photocatalytic activity and electrochemical catalytic performance, titanium dioxide can promote the chemical reaction and electrochemical reaction on the electrode surface, thereby optimizing the electrode structure, and titanium dioxide has a certain adsorption catalytic conversion effect on polysulfides. Therefore, nickel/titanium dioxide/carbon nanotube heterostructure catalysts were prepared by chemical vapor deposition, and the composition, structure and microstructure of the catalysts were analyzed by XRD, scanning electron microscopy, transmission electron microscopy and EDS, and the electrochemical performance was tested. The results show that the catalyst at 700？C can improve the electrochemical performance of lithium-sulfur batteries. The results of this paper provide a reference for the study of catalysts for inhibiting the shuttle effect of polysulfides in lithium-sulfur batteries.
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