Li Yingying, Li Xifei, Hao Youchen, Kakimov Alibek, Li Dejun, Sun Qian, Kou Liang, Tian Zhanyuan, Shao Le, Zhang Cheng, Zhang Jiujun, Sun Xueliang
Tianjin International Joint Research Centre of Surface Technology for Energy Storage Materials, Energy & Materials Engineering Centre, College of Physics and Materials Science, Tianjin Normal University, Tianjin, China.
Xi'an Key Laboratory of New Energy Materials and Devices, Institute of Advanced Electrochemical Energy & School of Materials Science and Engineering, Xi'an University of Technology, Xi'an, China.
Front Chem. 2020 Apr 23;8:309. doi: 10.3389/fchem.2020.00309. eCollection 2020.
Due to the shuttle effect and low conductivity of sulfur (S), it has been challenging to realize the application of lithium-sulfur (Li-S) batteries with high performance and long cyclability. In this study, a high catalytic active CNTs@FeOOH composite is introduced as a functional interlayer for Li-S batteries. Interestingly, the existence of oxygen vacancy in FeOOH functions electrocatalyst and promotes the catalytic conversion of intercepted lithium polysulfides (LiPS). As a result, the optimized CNTs@FeOOH interlayer contributed to a high reversible capacity of 556 mAh g at 3,200 mA g over 350 cycles. This study demonstrates that enhanced catalytic effect can accelerate conversion efficiency of polysulfides, which is beneficial of boosting high performance Li-S batteries.
由于硫（S）的穿梭效应和低导电性，实现具有高性能和长循环寿命的锂硫（Li-S）电池的应用一直具有挑战性。在本研究中，引入了一种高催化活性的碳纳米管@氢氧化铁（CNTs@FeOOH）复合材料作为锂硫电池的功能中间层。有趣的是，氢氧化铁中的氧空位起到了电催化剂的作用，并促进了截留的多硫化锂（LiPS）的催化转化。结果，优化后的CNTs@FeOOH中间层在3200 mA g的电流密度下经过350次循环后，可逆容量高达556 mAh g。本研究表明，增强的催化作用可以加速多硫化物的转化效率，这有利于推动高性能锂硫电池的发展。
