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A Quinonoid-Imine-Enriched Nanostructured Polymer Mediator for Lithium–Sulfur Batteries
Advanced Materials ( IF 27.4 ) Pub Date : 2017-04-18 01:51:05 , DOI: 10.1002/adma.201606802 Chen-Yu Chen 1 , Hong-Jie Peng 1 , Ting-Zheng Hou 1, 2 , Pei-Yan Zhai 1, 3 , Bo-Quan Li 1 , Cheng Tang 1 , Wancheng Zhu 3 , Jia-Qi Huang 1, 4 , Qiang Zhang 1
Advanced Materials ( IF 27.4 ) Pub Date : 2017-04-18 01:51:05 , DOI: 10.1002/adma.201606802 Chen-Yu Chen 1 , Hong-Jie Peng 1 , Ting-Zheng Hou 1, 2 , Pei-Yan Zhai 1, 3 , Bo-Quan Li 1 , Cheng Tang 1 , Wancheng Zhu 3 , Jia-Qi Huang 1, 4 , Qiang Zhang 1
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The reversible formation of chemical bonds has potential for tuning multi-electron redox reactions in emerging energy-storage applications, such as lithium−sulfur batteries. The dissolution of polysulfide intermediates, however, results in severe shuttle effect and sluggish electrochemical kinetics. In this study, quinonoid imine is proposed to anchor polysulfides and to facilitate the formation of Li2S2/Li2S through the reversible chemical transition between protonated state (NH+ ) and deprotonated state (N). When serving as the sulfur host, the quinonoid imine-doped graphene affords a very tiny shuttle current of 2.60 × 10−4 mA cm−2, a rapid redox reaction of polysulfide, and therefore improved sulfur utilization and enhanced rate performance. A high areal specific capacity of 3.72 mAh cm−2 is achieved at 5.50 mA cm−2 on the quinonoid imine-doped graphene based electrode with a high sulfur loading of 3.3 mg cm−2. This strategy sheds a new light on the organic redox mediators for reversible modulation of electrochemical reactions.
中文翻译：
富锂醌亚胺的纳米结构聚合物介体，用于锂硫电池
化学键的可逆形成可能会在新兴的能量存储应用（例如锂硫电池）中调节多电子氧化还原反应。然而，多硫化物中间体的溶解导致严重的穿梭效应和缓慢的电化学动力学。在这项研究中，提出了醌类亚胺固定多硫化物并通过质子化态（NH +）和去质子化态（N）之间可逆的化学转变促进Li 2 S 2 / Li 2 S的形成。当用作硫主体时，醌型亚胺掺杂的石墨烯可提供2.60×10 -4 mA cm -2的非常小的穿梭电流，多硫化物的快速氧化还原反应，因此提高了硫的利用率并提高了速率性能。的3.72毫安厘米高面积比容量-2在5.50毫安厘米实现-2与3.3毫克cm的高的硫负载对醌亚胺-掺杂的石墨烯基电极-2。该策略为可逆调节电化学反应的有机氧化还原介体提供了新的思路。
更新日期：2017-04-18
中文翻译：
富锂醌亚胺的纳米结构聚合物介体，用于锂硫电池
化学键的可逆形成可能会在新兴的能量存储应用（例如锂硫电池）中调节多电子氧化还原反应。然而，多硫化物中间体的溶解导致严重的穿梭效应和缓慢的电化学动力学。在这项研究中，提出了醌类亚胺固定多硫化物并通过质子化态（NH +）和去质子化态（N）之间可逆的化学转变促进Li 2 S 2 / Li 2 S的形成。当用作硫主体时，醌型亚胺掺杂的石墨烯可提供2.60×10 -4 mA cm -2的非常小的穿梭电流，多硫化物的快速氧化还原反应，因此提高了硫的利用率并提高了速率性能。的3.72毫安厘米高面积比容量-2在5.50毫安厘米实现-2与3.3毫克cm的高的硫负载对醌亚胺-掺杂的石墨烯基电极-2。该策略为可逆调节电化学反应的有机氧化还原介体提供了新的思路。
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