Highly stable potassium metal batteries enabled by regulating surface chemistry in ether electrolyte
Document Type
Article
Publication Date
11-2021
Department
Department of Physics
Abstract
Rechargeable potassium (K) metal batteries (PMBs) remain deeply challenged by the lack of suitable electrolytes that are stable against both highly reactive K anodes and 4 V-class cathodes. Despite their good reductive stability with K metal, classic potassium bis(fluorosulfonyl)amide (KFSI)-based ether electrolytes are typically used only in 3 M), is reported for the first time to be used in 4 V-class PMBs. A stable N/F-rich solid electrolyte interphase (SEI) is formed, enabling dense and uniform K deposition, especially under high current density. Remarkably, the PMBs with Prussian blue cathode exhibits an unprecedented cycle life (1000 cycles, 122 days). This work provides new perspectives of electrolyte design for 4 V-class PMBs.
Publication Title
Energy Storage Materials
Recommended Citation
Wang, H.,
Dong, J.,
Guo, Q.,
Xu, W.,
Zhang, H.,
Lau, K.,
Wei, Y.,
Hu, J.,
Zhai, D.,
&
Kang, F.
(2021).
Highly stable potassium metal batteries enabled by regulating surface chemistry in ether electrolyte.
Energy Storage Materials,
42, 526-532.
http://doi.org/10.1016/j.ensm.2021.08.013
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/16747