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Revealing the Multifunctional Electrocatalysis of Indium-Modulated Phthalocyanine for High-Performance Lithium-Sulfur Batteries
Energy & Environmental Materials ( IF 13.0 ) Pub Date : 2022-07-25 , DOI: 10.1002/eem2.12479 Yang Guo 1 , Zhaoqing Jin 2 , Jianhao Lu 2 , Zilong Wang 2 , Zihao Song 1 , Anbang Wang 2 , Weikun Wang 2 , Yaqin Huang 1
Energy & Environmental Materials ( IF 13.0 ) Pub Date : 2022-07-25 , DOI: 10.1002/eem2.12479 Yang Guo 1 , Zhaoqing Jin 2 , Jianhao Lu 2 , Zilong Wang 2 , Zihao Song 1 , Anbang Wang 2 , Weikun Wang 2 , Yaqin Huang 1
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The sluggish kinetics of complicated multiphase conversions and the severe shuttling effect of lithium polysulfides (LiPSs) significantly hinder the applications of Li-S battery, which is one of the most promising candidates for the next-generation energy storage system. Herein, a bifunctional electrocatalyst, indium phthalocyanine self-assembled with carbon nanotubes (InPc@CNT) composite material, is proposed to promote the conversion kinetics of both reduction and oxidation processes, demonstrating a bidirectional catalytic effect on both nucleation and dissolution of Li2S species. The theoretical calculation shows that the unique electronic configuration of InPc@CNT is conducive to trapping soluble polysulfides in the reduction process, as well as the modulation of electron transfer dynamics also endows the dissolution of Li2S in the oxidation reaction, which will accelerate the effectiveness of catalytic conversion and facilitate sulfur utilization. Moreover, the InPc@CNT modified separator displays lower overpotential for polysulfide transformation, alleviating polarization of electrode during cycling. The integrated spectroscopy analysis, HRTEM, and electrochemical study reveal that the InPc@CNT acts as an efficient multifunctional catalytic center to satisfy the requirements of accelerating charging and discharging processes. Therefore, the Li–S battery with InPc@CNT-modified separator obtains a discharge-specific capacity of 1415 mAh g−1 at a high rate of 0.5 C. Additionally, the 2 Ah Li–S pouch cells deliver 315 Wh kg−1 and achieved 80% capacity retention after 50 cycles at 0.1 C with a high sulfur loading of 10 mg cm−2. Our study provides a practical method to introduce bifunctional electrocatalysts for boosting the electrochemical properties of Li–S batteries.
中文翻译：
揭示用于高性能锂硫电池的铟调制酞菁的多功能电催化作用
复杂的多相转换的缓慢动力学和多硫化锂（LiPS）严重的穿梭效应极大地阻碍了锂硫电池的应用，而锂硫电池是下一代储能系统最有希望的候选者之一。在此，提出了一种双功能电催化剂，即与碳纳米管自组装的铟酞菁（InPc@CNT）复合材料，以促进还原和氧化过程的转化动力学，表现出对Li 2 S的成核和溶解的双向催化作用物种。理论计算表明，InPc@CNT独特的电子构型有利于在还原过程中捕获可溶性多硫化物，并且电子传递动力学的调节也赋予了Li 2 S在氧化反应中的溶解，从而加速了Li 2 S的溶解。催化转化的有效性并促进硫的利用。此外，InPc@CNT改性隔膜显示出较低的多硫化物转化过电势，减轻了循环过程中电极的极化。综合光谱分析、HRTEM 和电化学研究表明，InPc@CNT 作为高效的多功能催化中心，可以满足加速充电和放电过程的要求。因此，具有InPc@CNT改性隔膜的Li-S电池在0.5 C的高倍率下获得了1415 mAh g -1的放电比容量。此外，2 Ah Li-S软包电池可提供315 Wh kg -1在0.1 C下以10 mg cm -2的高硫负载量循环50次后，容量保持率达到80% 。我们的研究提供了一种引入双功能电催化剂来提高锂硫电池电化学性能的实用方法。
更新日期：2022-07-25
中文翻译：
揭示用于高性能锂硫电池的铟调制酞菁的多功能电催化作用
复杂的多相转换的缓慢动力学和多硫化锂（LiPS）严重的穿梭效应极大地阻碍了锂硫电池的应用，而锂硫电池是下一代储能系统最有希望的候选者之一。在此，提出了一种双功能电催化剂，即与碳纳米管自组装的铟酞菁（InPc@CNT）复合材料，以促进还原和氧化过程的转化动力学，表现出对Li 2 S的成核和溶解的双向催化作用物种。理论计算表明，InPc@CNT独特的电子构型有利于在还原过程中捕获可溶性多硫化物，并且电子传递动力学的调节也赋予了Li 2 S在氧化反应中的溶解，从而加速了Li 2 S的溶解。催化转化的有效性并促进硫的利用。此外，InPc@CNT改性隔膜显示出较低的多硫化物转化过电势，减轻了循环过程中电极的极化。综合光谱分析、HRTEM 和电化学研究表明，InPc@CNT 作为高效的多功能催化中心，可以满足加速充电和放电过程的要求。因此，具有InPc@CNT改性隔膜的Li-S电池在0.5 C的高倍率下获得了1415 mAh g -1的放电比容量。此外，2 Ah Li-S软包电池可提供315 Wh kg -1在0.1 C下以10 mg cm -2的高硫负载量循环50次后，容量保持率达到80% 。我们的研究提供了一种引入双功能电催化剂来提高锂硫电池电化学性能的实用方法。
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