High-Energy and Long-Lifespan Potassium-Sulfur Batteries Enabled by Concentrated Electrolyte
- Authors
- Lee, Suyeong; Park, Hyeona; Rizell, Josef; Kim, Un-Hyuck; Liu, Yangyang; Xu, Xieyu; Xiong, Shizhao; Matic, Aleksandar; Zikri, Adi Tiara; Kang, Hyokyeong; Sun, Yang-Kook; Kim, Jaekook; Hwang, Jang-Yeon
- Issue Date
- Nov-2022
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- concentrated electrolytes; dendrite-free; high areal capacities; potassium-sulfur batteries; SPAN cathodes
- Citation
- ADVANCED FUNCTIONAL MATERIALS, v.32, no.46, pp.1 - 12
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED FUNCTIONAL MATERIALS
- Volume
- 32
- Number
- 46
- Start Page
- 1
- End Page
- 12
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/186114
- DOI
- 10.1002/adfm.202209145
- ISSN
- 1616-301X
- Abstract
- Potassium-sulfur (K-S) batteries are emerging as low-cost and high-capacity energy-storage technology. However, conventional K-S batteries suffer from two critical issues that have not yet been successfully resolved: the dissolution of potassium polysulfides (KPS) into the liquid electrolyte and the formation of K dendrites on the K metal anode, which lead to inadequate cycling efficiencies with a low reversible capacity. Herein, a high-capacity and long cycle-life K-S battery consisting of a highly concentrated electrolyte (HCE) (4.34 mol kg(-1) potassium bis(fluorosulfonyl)imide in a 1,2-Dimethoxyethane) and a sulfurized polyacrylonitrile (SPAN) cathode is presented The application of a HCE efficiently suppresses the dendritic growth of K, as evidenced by operando optical imaging and phase field modeling, owing to the reduced K-ion depletion on the electrode surface and a uniform Faradaic current density over the K metal anode surface. Additionally, because S is covalently bonded to the C backbone of PAN in the SPAN structure, the SPAN cathode inhibits the dissolution of KPS. These features generate synergy that the proposed K-S battery can provide a practical areal capacity of 2.5 mAh cm(-2) and unprecedented lifetimes with high Coulombic efficiencies over 700 cycles.
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