Multifunctional Separator Allows Stable Cycling of Potassium Metal Anodes and of Potassium Metal Batteries Liu, Pengcheng Hao, Hongchang Celio, Hugo Cui, Jinlei Ren, Muqing Wang, Yixian Dong, Hui Chowdhury, Aminur Rashid Hutter, Tanya Perras, Frédéric A. Nanda, Jagjit Watt, John Mitlin, David
dc.contributor.department Ames National Laboratory 2023-05-16T18:12:35Z 2023-05-16T18:12:35Z 2021-11-05
dc.description.abstract This is the first report of a multifunctional separator for potassium-metal batteries (KMBs). Here, double-coated tape-cast microscale AlF3 on polypropylene (AlF3@PP) yields state-of-the-art electrochemical performance: symmetric cells are stable after 1000 cycles (2000 h) at 0.5 mA cm–2 and 0.5 mAh cm–2, with 0.042 V overpotential. Stability is maintained at 5.0 mA cm–2 for 600 cycles (240 h), with 0.138 V overpotential. Postcycled plated surface is dendrite-free, while stripped surface contains smooth solid electrolyte interphase (SEI). Conventional PP cells fail rapidly, with dendrites at plating, and “dead metal” and SEI clumps at stripping. Potassium hexacyanoferrate(III) cathode KMBs with AlF3@PP display enhanced capacity retention (91% at 100 cycles vs 58%). AlF3 partially reacts with K to form an artificial SEI containing KF, AlF3, and Al2O3 phases. The AlF3@PP promotes complete electrolyte wetting and enhances uptake, improves ion conductivity, and increases ion transference number. The higher of K+ transference number is ascribed to the strong interaction between AlF3 and FSI– anions, as revealed through 19F NMR. The enhancement in wetting and performance is general, being demonstrated with ester- and ether-based solvents, with K-, Na-, or Li- salts, and with different commercial separators. In full batteries, AlF3 prevents Fe crossover and cycling-induced cathode pulverization.
dc.description.comments This is a manuscript of an article published as Liu, Pengcheng, Hongchang Hao, Hugo Celio, Jinlei Cui, Muqing Ren, Yixian Wang, Hui Dong et al. "Multifunctional separator allows stable cycling of potassium metal anodes and of potassium metal batteries." Advanced Materials 34, no. 7 (2022): 2105855. DOI: 10.1002/adma.202105855. Copyright 2021 Wiley-VCH GmbH. DOE Contract Number(s): 89233218CNA000001; AC05-00OR22725; NA0003525; AC02-07CH11358; 1911905. Posted with permission.
dc.identifier.other 1832397
dc.identifier.other 1835495
dc.identifier.other 1835552
dc.identifier.other 1866679
dc.language.iso en
dc.publisher Iowa State University Digital Repository, Ames IA (United States)
dc.relation.ispartofseries IS-J 10672
dc.source.uri *
dc.subject.disciplines DegreeDisciplines::Engineering::Materials Science and Engineering
dc.subject.keywords potassium sulfur battery
dc.subject.keywords lithium metal battery (LMB)
dc.subject.keywords sodium metal battery (SMB, NMB)
dc.subject.keywords lithium sulfur battery
dc.subject.keywords potassium ion battery (KIB, PIB)
dc.title Multifunctional Separator Allows Stable Cycling of Potassium Metal Anodes and of Potassium Metal Batteries
dc.type Article
dspace.entity.type Publication
relation.isOrgUnitOfPublication 25913818-6714-4be5-89a6-f70c8facdf7e
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