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Boosting the Electrochemical Performance of Li–S Batteries with a Dual Polysulfides Confinement Strategy
Small ( IF 13.0 ) Pub Date : 2018-09-19 , DOI: 10.1002/smll.201802516 Yu Yao 1 , Wanlin Feng 2 , Minglong Chen 1 , Xiongwu Zhong 1 , Xiaojun Wu 1 , Haibin Zhang 2 , Yan Yu 1, 3
Small ( IF 13.0 ) Pub Date : 2018-09-19 , DOI: 10.1002/smll.201802516 Yu Yao 1 , Wanlin Feng 2 , Minglong Chen 1 , Xiongwu Zhong 1 , Xiaojun Wu 1 , Haibin Zhang 2 , Yan Yu 1, 3
Affiliation
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Lithium–sulfur (Li–S) batteries have attracted more and more attention because they represent one of the most promising candidates to satisfy emerging energy storage demands. The biggest challenge regarding the application of the Li–S battery is to suppress the polysulfide shuttle while maintaining a high sulfur loading mass. Here, a dual polysulfide confinement strategy is designed by confinement of sulfur in polydopamine‐coated MXene nanosheets (denoted as S@Mxe@PDA) that performs as a high‐performance cathode for Li–S cells owing to their inherently high underlying metallic conductivity and chemical bonding and strong chemical adsorption to lithium polysulfides (LPs). This dual LPs confinement strategy is supported by the results of density functional theory calculations. It is demonstrated that the S@Mxe@PDA cathode exhibits outstanding electrochemical properties, including high reversible capacity (1044 mAh g−1 after 150 cycles at 0.2 C), superior rate capability (624 mAh g−1 at 6 C) and excellent cycling stability (556 mAh g−1 after 330 cycles at 0.5 C with 4.4 mg cm−2 sulfur loading). This work offers a facile and effective method for boosting Li–S batteries into practical applications.
中文翻译：
采用双重多硫化物限制策略提高Li-S电池的电化学性能
锂硫（Li–S）电池吸引了越来越多的关注，因为它们代表了满足新兴能源存储需求的最有希望的候选者之一。使用Li–S电池面临的最大挑战是在保持高硫负载量的同时抑制多硫化物穿梭。在这里，通过将硫限制在聚多巴胺涂层的MXene纳米片（表示为S @ Mxe @ PDA）中来设计双重多硫化物限制策略，由于其固有的高基础金属电导率和高的Li-S电池性能，Li-S电池可以用作高性能阴极。化学键和对多硫化锂（LPs）的强烈化学吸附。密度泛函理论计算的结果支持了这种双重LP限制策略。在0.2 C下进行150次循环后-1），优异的倍率能力（6 C下为624 mAh g -1）和出色的循环稳定性（在0.5 C进行330次循环后硫含量为4.4 mg cm -2时为556 mAh g -1）。这项工作为将Li-S电池投入实际应用提供了一种简便有效的方法。
更新日期：2018-09-19
中文翻译：
采用双重多硫化物限制策略提高Li-S电池的电化学性能
锂硫（Li–S）电池吸引了越来越多的关注，因为它们代表了满足新兴能源存储需求的最有希望的候选者之一。使用Li–S电池面临的最大挑战是在保持高硫负载量的同时抑制多硫化物穿梭。在这里，通过将硫限制在聚多巴胺涂层的MXene纳米片（表示为S @ Mxe @ PDA）中来设计双重多硫化物限制策略，由于其固有的高基础金属电导率和高的Li-S电池性能，Li-S电池可以用作高性能阴极。化学键和对多硫化锂（LPs）的强烈化学吸附。密度泛函理论计算的结果支持了这种双重LP限制策略。在0.2 C下进行150次循环后-1），优异的倍率能力（6 C下为624 mAh g -1）和出色的循环稳定性（在0.5 C进行330次循环后硫含量为4.4 mg cm -2时为556 mAh g -1）。这项工作为将Li-S电池投入实际应用提供了一种简便有效的方法。
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