Metal-Organic Framework Separator as a Polyselenide Filter for High-Performance Lithium-Selenium Batteries
Journal article
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Publication Details
Author list: Hossain M.A., Tulaphol S., Thapa A.K., Rahaman M.S., Jasinski J.B., Wang H., Sunkara M.K., Syzdek J., Ozdemir O.K., Ornstein J.M., Sathitsuksanoh N.
Publisher: American Chemical Society
Publication year: 2021
Volume number: 4
Issue number: 12
Start page: 13450
End page: 13460
Number of pages: 11
ISSN: 25740962
eISSN: 2574-0962
Languages: English-Great Britain (EN-GB)
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Abstract
Rapid self-discharge, poor cycling stability, and low Coulombic efficiency from polyselenide shuttling have retarded practical applications of lithium-selenium batteries. Here, we show that a cation-selective PCN separator of PCN-250(Fe) metal-organic frameworks coated on a porous polypropylene membrane suppresses polyselenide shuttle and enhances lithium-ion transport in lithium-selenium batteries. The Lewis acid sites of this PCN separator acted as selective barriers that immobilized polyselenides and provided uniform and stable lithium nucleation and growth during cycling. Lithium-selenium cells with the PCN separator had a stable and reversible electrochemical performance with a high discharge capacity of 423 mAh/g at C/5 and a Coulombic efficiency of >98% for 500 cycles. This work provides a guide for developing high-performance lithium-selenium batteries by a cation-selective separator strategy. This PCN separator can be applied to alkali-metal and alkali-metal chalcogenide battery systems.
Keywords
batteries, lithium-selenium, polyselenides, shuttle effect, TFSI anions