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A New Hydrophilic Binder Enabling Strongly Anchoring Polysulfides for High‐Performance Sulfur Electrodes in Lithium‐Sulfur Battery
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-01-15 , DOI: 10.1002/aenm.201702889 Wei Chen 1 , Tianyu Lei 1 , Tao Qian 2, 3 , Weiqiang Lv 4 , Weidong He 4 , Chunyang Wu 1 , Xuejun Liu 2, 3 , Jie Liu 2, 3 , Bo Chen 5 , Chenglin Yan 2, 3 , Jie Xiong 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-01-15 , DOI: 10.1002/aenm.201702889 Wei Chen 1 , Tianyu Lei 1 , Tao Qian 2, 3 , Weiqiang Lv 4 , Weidong He 4 , Chunyang Wu 1 , Xuejun Liu 2, 3 , Jie Liu 2, 3 , Bo Chen 5 , Chenglin Yan 2, 3 , Jie Xiong 1
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As one of the important ingredients in lithium‐sulfur battery, the binders greatly impact the battery performance. However, conventional binders have intrinsic drawbacks such as poor capability of absorbing hydrophilic lithium polysulfides, resulting in severe capacity decay. This study reports a new type of binder by polymerization of hydrophilic poly(ethylene glycol) diglycidyl ether with polyethylenimine, which enables strongly anchoring polysulfides for high‐performance lithium sulfur batteries, demonstrating remarkable improvement in both mechanical performance for standing up to 100 g weight and an excellent capacity retention of 72% over 400 cycles at 1.5 C. Importantly, in situ micro‐Raman investigation verifies the effectively reduced polysulfides shuttling from sulfur cathode to lithium anode, which shows the greatly suppressed shuttle effect by the polar‐functional binder. X‐ray photoelectron spectroscopy analysis into the discharge intermediates upon battery cycling reveals that the hydrophilic binder endows the sulfur electrodes with multidimensional Li‐O, Li‐N, and S‐O interactions with sulfur species to effectively mitigate lithium polysulfide dissolution, which is theoretically confirmed by density‐functional theory calculations.
中文翻译：
一种新的亲水结合剂，能够牢固地锚固多硫化物，用于锂硫电池中的高性能硫电极
作为锂硫电池的重要成分之一，粘合剂极大地影响了电池的性能。然而，常规的粘合剂具有固有的缺点，例如吸收亲水性多硫化锂的能力差，导致严重的容量衰减。这项研究报告了一种通过亲水性聚乙二醇二缩水甘油醚与聚乙烯亚胺聚合的新型粘合剂，该粘合剂能够牢固地锚固高性能硫化锂电池的聚硫化物，从而证明了在承受100 g重量时的机械性能和在耐高温下均表现出显着的改善。在1.5 C下在400个循环中具有72％的出色容量保持率。重要的是，原位显微拉曼研究验证了从硫阴极到锂阳极的有效减少的多硫化物穿梭，这表明极性功能粘合剂极大地抑制了穿梭效应。X射线光电子能谱分析电池循环后的放电中间体表明，亲水性粘合剂赋予硫电极以多维的Li-O，Li-N和S-O与硫种类的相互作用，从而有效地减轻了多硫化锂的溶解，这在理论上是有效的通过密度泛函理论计算得到证实。
更新日期：2018-01-15
中文翻译：
一种新的亲水结合剂，能够牢固地锚固多硫化物，用于锂硫电池中的高性能硫电极
作为锂硫电池的重要成分之一，粘合剂极大地影响了电池的性能。然而，常规的粘合剂具有固有的缺点，例如吸收亲水性多硫化锂的能力差，导致严重的容量衰减。这项研究报告了一种通过亲水性聚乙二醇二缩水甘油醚与聚乙烯亚胺聚合的新型粘合剂，该粘合剂能够牢固地锚固高性能硫化锂电池的聚硫化物，从而证明了在承受100 g重量时的机械性能和在耐高温下均表现出显着的改善。在1.5 C下在400个循环中具有72％的出色容量保持率。重要的是，原位显微拉曼研究验证了从硫阴极到锂阳极的有效减少的多硫化物穿梭，这表明极性功能粘合剂极大地抑制了穿梭效应。X射线光电子能谱分析电池循环后的放电中间体表明，亲水性粘合剂赋予硫电极以多维的Li-O，Li-N和S-O与硫种类的相互作用，从而有效地减轻了多硫化锂的溶解，这在理论上是有效的通过密度泛函理论计算得到证实。
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