Aqueous-Processable Redox-Active Supramolecular Polymer Binders for Advanced Lithium/Sulfur Cells
Aqueous-Processable Redox-Active Supramolecular Polymer Binders for Advanced Lithium/Sulfur Cells
复制标题
DOI：
10.1021/acs.chemmater.7b03870
复制
发表时间：
2018-01
影响因子：
8.6
通讯作者：
Y. Hwa;Peter D. Frischmann;B. Helms;E. Cairns
中科院分区：
文献类型：
--
作者：
Y. Hwa;Peter D. Frischmann;B. Helms;E. Cairns
锂/硫（Li/S）电池是一种有前途的化学物质，与最先进的锂离子电池相比，具有提供能量密度阶跃变化的潜力。为了使Li/S电池制造的环境影响最小化并且在性能和成本方面与Li离子电池竞争，使用水性工艺铸造的电极是非常期望的。在这里，我们描述了锂化的氧化还原介导的超分子粘合剂的发现和应用的基础上，众所周知的n型半导体，二萘嵌苯双酰亚胺，形成高保真硫电极从水处理浆料。据报道，与对照样品相比，预锂化的超分子粘合剂在3.0 C下的硫利用率提高了1.4倍，在1.5 C下250次循环后的容量保持率提高了58%。这些改进归因于锂化的苝酰亚胺粘合剂在水中的自组装，以产生纳米线网络形态，增加电极组件之间的界面面积，并表现出增强的导电性。
Lithium/Sulfur (Li/S) cells are a promising chemistry with potential to deliver a step-change in energy density compared to state-of-the-art Li-ion batteries. To minimize the environmental impact of the Li/S cell manufacturing and to compete with Li-ion cells in both performance and cost, electrodes cast using an aqueous process are highly desirable. Here we describe the discovery and application of a lithiated redox-mediating supramolecular binder based on the well-known n-type semiconductor, perylene bisimide, that forms high-fidelity sulfur electrodes from water-processed slurries. A 1.4-fold improvement in sulfur utilization at 3.0 C and 58% increase in capacity retention after 250 cycles at 1.5 C are reported for the prelithiated, supramolecular binder compared to control samples. These improvements are attributed to the self-assembly of lithiated perylene bisimide binders in water to yield nanowire web morphologies that increase interfacial area between electrode components and exhibit enhanced elec...