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A sulfone-based crystalline organic electrolyte for 5 V solid-state potassium batteries

Title
A sulfone-based crystalline organic electrolyte for 5 V solid-state potassium batteries
Author(s)
Kang, SeokbumJeon, BoosikHong, Seung-TaeLee, Hochun
Issued Date
2022-09
Citation
Chemical Engineering Journal, v.443
Type
Article
Keywords
SELF-BINDINGIONDENSITYLIQUIDSAFEHIGH-VOLTAGEROOM-TEMPERATURE
ISSN
1385-8947
Abstract
Solid-state potassium batteries are promising energy storage systems, but their wide use requires suitable solid electrolytes to ensure high ionic conductivity, electrochemical stability, and contacting ability with composite electrodes. For this purpose, this study introduces sulfone-based crystalline organic electrolytes (SCOEs) consisting of dimethyl sulfone (DMS) and potassium bis(fluorosulfonyl)imide (KFSI). One solid-state SCOE, KFSI/DMS 1:9 by mol, exhibits high ionic conductivity (4.0 x 10(-4) S cm(-1) at 25 C), oxidation stability (-5.8 V vs. K+/K-), and negligible flammability. Moreover, owing to its optimal melting point (94 C), the SCOE enables seamless contact with the composite electrodes through the melt-casting process, which has been challenging for other solid-state electrolytes. K|| KVPO4F cells filled with this SCOE show improved cycle performance (capacity retention 88.8% after 100 cycles vs. 77.6% after 74 cycles at 25 C) with high Coulombic efficiency (asymptotic value 99.6% vs. 92.0%) compared to cells with a conventional carbonate electrolyte. With these results, the developed SCOE paves the way to room-temperature operable, 5 V solid-state potassium batteries.
URI
http://hdl.handle.net/20.500.11750/16968
DOI
10.1016/j.cej.2022.136403
Publisher
Elsevier BV
Related Researcher
  • 홍승태 Hong, Seung-Tae 에너지공학과
  • Research Interests Magnesium; calcium; and zinc ion batteries; lithium all-solid-state batteries; Inorganic materials discovery; Solid state chemistry; Crystallography; Mg; Ca; Zn 이온 이차전지; 리튬 전고체전지; 신 무기재료 합성; 고체화학; 결정화학
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Appears in Collections:
Department of Energy Science and Engineering Battery Materials Discovery Laboratory 1. Journal Articles
Department of Energy Science and Engineering Electrochemistry Laboratory for Sustainable Energy(ELSE) 1. Journal Articles

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