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Multifunctional Sandwich‐Structured Electrolyte for High‐Performance Lithium–Sulfur Batteries
Advanced Science ( IF 14.3 ) Pub Date : 2018-01-02 , DOI: 10.1002/advs.201700503 Hongtao Qu 1, 2 , Jianjun Zhang 1, 2 , Aobing Du 1, 2 , Bingbing Chen 1 , Jingchao Chai 1, 2 , Nan Xue 1, 2 , Longlong Wang 1, 2 , Lixin Qiao 1 , Chen Wang 1, 2 , Xiao Zang 1 , Jinfeng Yang 1, 2 , Xiaogang Wang 1 , Guanglei Cui 1
Advanced Science ( IF 14.3 ) Pub Date : 2018-01-02 , DOI: 10.1002/advs.201700503 Hongtao Qu 1, 2 , Jianjun Zhang 1, 2 , Aobing Du 1, 2 , Bingbing Chen 1 , Jingchao Chai 1, 2 , Nan Xue 1, 2 , Longlong Wang 1, 2 , Lixin Qiao 1 , Chen Wang 1, 2 , Xiao Zang 1 , Jinfeng Yang 1, 2 , Xiaogang Wang 1 , Guanglei Cui 1
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Due to its high theoretical energy density (2600 Wh kg−1), low cost, and environmental benignity, the lithium–sulfur (Li‐S) battery is attracting strong interest among the various electrochemical energy storage systems. However, its practical application is seriously hampered by the so‐called shuttle effect of the highly soluble polysulfides. Herein, a novel design of multifunctional sandwich‐structured polymer electrolyte (polymer/cellulose nonwoven/nanocarbon) for high‐performance Li‐S batteries is demonstrated. It is verified that Li‐S battery with this sandwich‐structured polymer electrolyte delivers excellent cycling stability (only 0.039% capacity decay cycle−1 on average exceeding 1500 cycles at 0.5 C) and rate capability (with a reversible capacity of 594 mA h g−1 at 4 C). These electrochemical performances are attributed to the synergistic effect of each layer in this unique sandwich‐structured polymer electrolyte including steady lithium stripping/plating, strong polysulfide absorption ability, and increased redox reaction sites. More importantly, even with high sulfur loading of 4.9 mg cm−2, Li‐S battery with this sandwich‐structured polymer electrolyte can deliver high initial areal capacity of 5.1 mA h cm−2. This demonstrated strategy here may open up a new era of designing hierarchical structured polymer electrolytes for high‐performance Li‐S batteries.
中文翻译：
用于高性能锂硫电池的多功能三明治结构电解质
由于其高理论能量密度（2600 Wh kg -1）、低成本和环境友好性，锂硫（Li-S）电池引起了各种电化学储能系统的浓厚兴趣。然而，其实际应用受到高溶解度多硫化物所谓的穿梭效应的严重阻碍。本文展示了一种用于高性能锂硫电池的多功能夹层结构聚合物电解质（聚合物/纤维素无纺布/纳米碳）的新颖设计。经验证，采用这种三明治结构聚合物电解质的锂硫电池具有优异的循环稳定性（在0.5 C下超过1500次循环时平均容量衰减周期-1仅为0.039% ）和倍率性能（可逆容量为594 mA hg - 1于 4 C）。这些电化学性能归因于这种独特的三明治结构聚合物电解质中各层的协同效应，包括稳定的脱锂/镀锂、强的多硫化物吸收能力和增加的氧化还原反应位点。更重要的是，即使在4.9 mg cm -2的高硫负载量下，采用这种三明治结构聚合物电解质的Li-S电池也能提供5.1 mA h cm -2的高初始面积容量。这里展示的策略可能会开启为高性能锂硫电池设计分层结构聚合物电解质的新时代。
更新日期：2018-01-02
中文翻译：
用于高性能锂硫电池的多功能三明治结构电解质
由于其高理论能量密度（2600 Wh kg -1）、低成本和环境友好性，锂硫（Li-S）电池引起了各种电化学储能系统的浓厚兴趣。然而，其实际应用受到高溶解度多硫化物所谓的穿梭效应的严重阻碍。本文展示了一种用于高性能锂硫电池的多功能夹层结构聚合物电解质（聚合物/纤维素无纺布/纳米碳）的新颖设计。经验证，采用这种三明治结构聚合物电解质的锂硫电池具有优异的循环稳定性（在0.5 C下超过1500次循环时平均容量衰减周期-1仅为0.039% ）和倍率性能（可逆容量为594 mA hg - 1于 4 C）。这些电化学性能归因于这种独特的三明治结构聚合物电解质中各层的协同效应，包括稳定的脱锂/镀锂、强的多硫化物吸收能力和增加的氧化还原反应位点。更重要的是，即使在4.9 mg cm -2的高硫负载量下，采用这种三明治结构聚合物电解质的Li-S电池也能提供5.1 mA h cm -2的高初始面积容量。这里展示的策略可能会开启为高性能锂硫电池设计分层结构聚合物电解质的新时代。
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