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Permselective metal-organic framework gel membrane enables long-life cycling of rechargeable organic batteries

Cited 55 time in Web of Science Cited 62 time in Scopus
Issue Date
2021-01
Citation
Nature Nanotechnology, Vol.16 No.1, pp.77-84
Abstract
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 (Me(2)BBQ) as the electrode displays high cycle stability with capacity retention of 82.9% after 2,000 cycles, corresponding to a capacity decay of similar to 0.008% per cycle, with a discharge capacity of similar to 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.
ISSN
1748-3387
URI
https://hdl.handle.net/10371/178479
DOI
https://doi.org/10.1038/s41565-020-00788-x
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