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Selective Catalysis Remedies Polysulfide Shuttling in Lithium-Sulfur Batteries
Advanced Materials ( IF 27.4 ) Pub Date : 2021-08-02 , DOI: 10.1002/adma.202101006 Wuxing Hua 1 , Huan Li 2 , Chun Pei 3 , Jingyi Xia 1 , Yafei Sun 3 , Chen Zhang 4 , Wei Lv 5 , Ying Tao 1 , Yan Jiao 2 , Bingsen Zhang 6 , Shi-Zhang Qiao 2 , Ying Wan 3 , Quan-Hong Yang 1, 7
Advanced Materials ( IF 27.4 ) Pub Date : 2021-08-02 , DOI: 10.1002/adma.202101006 Wuxing Hua 1 , Huan Li 2 , Chun Pei 3 , Jingyi Xia 1 , Yafei Sun 3 , Chen Zhang 4 , Wei Lv 5 , Ying Tao 1 , Yan Jiao 2 , Bingsen Zhang 6 , Shi-Zhang Qiao 2 , Ying Wan 3 , Quan-Hong Yang 1, 7
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The shuttling of soluble lithium polysulfides between the electrodes leads to serious capacity fading and excess use of electrolyte, which severely bottlenecks practical use of Li-S batteries. Here, selective catalysis is proposed as a fundamental remedy for the consecutive solid-liquid-solid sulfur redox reactions. The proof-of-concept Indium (In)-based catalyst targetedly decelerates the solid-liquid conversion, dissolution of elemental sulfur to polysulfides, while accelerates the liquid-solid conversion, deposition of polysulfides into insoluble Li2S, which basically reduces accumulation of polysulfides in electrolyte, finally inhibiting the shuttle effect. The selective catalysis is revealed, experimentally and theoretically, by changes of activation energies and kinetic currents, modified reaction pathway together with the probed dynamically changing catalyst (LiInS2 catalyst), and gradual deactivation of the In-based catalyst. The In-based battery works steadily over 1000 cycles at 4.0 C and yields an initial areal capacity up to 9.4 mAh cm−2 with a sulfur loading of ≈9.0 mg cm−2.
中文翻译：
锂硫电池中多硫化物穿梭的选择性催化补救措施
可溶性多硫化锂在电极间穿梭导致容量衰减严重和电解液过度使用，严重制约了锂硫电池的实际应用。在这里，选择性催化被提议作为连续固-液-固硫氧化还原反应的基本补救措施。概念验证的铟 (In) 基催化剂有针对性地减缓固液转化，将元素硫溶解为多硫化物，同时加速液固转化，多硫化物沉积为不溶性锂2S，基本上减少了电解质中多硫化物的积累，最终抑制了穿梭效应。通过活化能和动力学电流的变化、与探测的动态变化的催化剂（LiInS 2催化剂）一起改变反应途径以及In 基催化剂的逐渐失活，选择性催化在实验和理论上被揭示。基于 In 的电池在 4.0 C 下稳定工作超过 1000 次循环，并产生高达 9.4 mAh cm -2的初始面积容量，硫负载量为 ≈9.0 mg cm -2。
更新日期：2021-09-21
中文翻译：
锂硫电池中多硫化物穿梭的选择性催化补救措施
可溶性多硫化锂在电极间穿梭导致容量衰减严重和电解液过度使用，严重制约了锂硫电池的实际应用。在这里，选择性催化被提议作为连续固-液-固硫氧化还原反应的基本补救措施。概念验证的铟 (In) 基催化剂有针对性地减缓固液转化，将元素硫溶解为多硫化物，同时加速液固转化，多硫化物沉积为不溶性锂2S，基本上减少了电解质中多硫化物的积累，最终抑制了穿梭效应。通过活化能和动力学电流的变化、与探测的动态变化的催化剂（LiInS 2催化剂）一起改变反应途径以及In 基催化剂的逐渐失活，选择性催化在实验和理论上被揭示。基于 In 的电池在 4.0 C 下稳定工作超过 1000 次循环，并产生高达 9.4 mAh cm -2的初始面积容量，硫负载量为 ≈9.0 mg cm -2。
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