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Permselective metal–organic framework gel membrane enables long-life cycling of rechargeable organic batteries
Nature Nanotechnology ( IF 38.3 ) Pub Date : 2020-11-02 , DOI: 10.1038/s41565-020-00788-x
Songyan Bai 1 , Byunghoon Kim 1, 2 , Chungryeol Kim 3 , Orapa Tamwattana 1 , Hyeokjun Park 1 , Jihyeon Kim 1 , Dongwhan Lee 3 , Kisuk Kang 1, 2, 4, 5
Affiliation  

Rechargeable organic batteries show great potential as a low-cost, sustainable and mass-producible alternatives to current transition-metal-based cells; however, serious electrode dissolution issues and solubilization of organic redox intermediates (shuttle effect) have plagued the capacity retention and cyclability of these cells. Here we report on the use of a metal–organic framework (MOF) gel membrane as a separator for organic batteries. The homogeneous micropores, intrinsic of the MOF-gel separator, act as permselective channels for targeted organic intermediates, thereby mitigating the shuttling problem without sacrificing power. A battery using a MOF-gel separator and 5,5′-dimethyl-2,2′-bis-p-benzoquinone (Me2BBQ) as the electrode displays high cycle stability with capacity retention of 82.9% after 2,000 cycles, corresponding to a capacity decay of ~0.008% per cycle, with a discharge capacity of ~171 mA h g−1 at a current density of 300 mA g−1. The molecular and ionic sieving capabilities of MOF-gel separators promise general applicability, as pore size can be tuned to specific organic electrode materials. The use of MOF-gel separators to prevent side reactions of soluble organic redox intermediates could lead to the development of rechargeable organic batteries with high energy density and long cycling life.



中文翻译:

选择性渗透金属-有机骨架凝胶膜可实现可充电有机电池的长寿命循环

可充电有机电池显示出作为当前过渡金属电池的低成本、可持续和可大规模生产的替代品的巨大潜力;然而,严重的电极溶解问题和有机氧化还原中间体的溶解(穿梭效应)困扰着这些电池的容量保持和循环能力。在这里,我们报告了使用金属有机骨架 (MOF) 凝胶膜作为有机电池隔膜的情况。MOF-凝胶分离器固有的均匀微孔充当目标有机中间体的选择性渗透通道,从而在不牺牲功率的情况下减轻穿梭问题。使用 MOF 凝胶隔膜和 5,5'-二甲基-2,2'-双对苯醌 (Me 2BBQ)作为电极显示出高循环稳定性,在 2,000 次循环后容量保持率为 82.9%,对应于每个循环的容量衰减为~0.008%,在 300 mA g 的电流密度下放电容量为~171 mA hg -1 -1。MOF-凝胶隔膜的分子和离子筛分能力有望普遍适用,因为孔径可以根据特定的有机电极材料进行调整。使用 MOF 凝胶隔膜来防止可溶性有机氧化还原中间体的副反应可能导致开发具有高能量密度和长循环寿命的可充电有机电池。

更新日期:2020-11-02
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