Ultra-stable all-solid-state sodium-metal batteries enabled by perfluoropolyether-based electrolytes

Wang, Xiaoen, Zhang, C, Sawczyk, M, Yuan, Q, Chen, F, Mendes, T, Howlett, Patrick, Fu, C, Searles, DJ, Kral, P, Hawker, C, Whittaker, A and Forsyth, Maria 2021, Ultra-stable all-solid-state sodium-metal batteries enabled by perfluoropolyether-based electrolytes, Nature Portfolio, pp. 1-26, doi: 10.21203/rs.3.rs-354912/v2.

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Title Ultra-stable all-solid-state sodium-metal batteries enabled by perfluoropolyether-based electrolytes
Author(s) Wang, XiaoenORCID iD for Wang, Xiaoen orcid.org/0000-0001-7713-7062
Zhang, C
Sawczyk, M
Yuan, Q
Chen, F
Mendes, T
Howlett, PatrickORCID iD for Howlett, Patrick orcid.org/0000-0002-2151-2932
Fu, C
Searles, DJ
Kral, P
Hawker, C
Whittaker, A
Forsyth, MariaORCID iD for Forsyth, Maria orcid.org/0000-0002-4273-8105
Journal name Nature Portfolio
Start page 1
End page 26
Total pages 26
Publisher Research Square
Publication date 2021-04-01
Summary Abstract Rechargeable batteries paired with sodium (Na)-metal anodes are considered as one of the most promising high energy and low-cost energy storage systems. However, the use of highly reactive Na metal and the formation of Na dendrites during battery operation have caused significant safety concerns, especially when highly flammable liquid electrolytes are used. Herein, we design and develop a solvent-free solid polymer electrolytes (SPEs) based on a perfluoropolyether (PFPE) terminated polyethylene glycol (PEG)-based block copolymer for safe and stable all-solid-state Na-metal batteries. Compared with traditional poly(ethylene oxide) (PEO) or PEG SPEs, our results suggest that block copolymer design allows for the formation of self-assembled microstructures leading to high storage modulus at elevated temperatures with the PEG domains providing transport channels even at high salt concentration (EO/Na+ = 8:2). Moreover, it is demonstrated that the incorporation of PFPE segments enhances the Na+ transference number of the electrolyte to 0.46 at 80 oC. Finally, the proposed SPE exhibits highly stable symmetric cell cycling performance with high current density (0.5 mA cm-2 and 1.0 mAh cm-2, up to 1300 hours). The assembled all-solid-state Na-metal batteries with Na3V2(PO4)3 cathode demonstrate outstanding rate performance, high capacity retention and long-term charge/discharge stability (CE = 99.91%) after more than 900 cycles.
Notes This preprint is under consideration at a Nature Portfolio Journal.
Language eng
DOI 10.21203/rs.3.rs-354912/v2
Indigenous content off
Field of Research 030304 Physical Chemistry of Materials
030306 Synthesis of Materials
HERDC Research category C1 Refereed article in a scholarly journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30149914

Document type: Journal Article
Collections: Institute for Frontier Materials
GTP Research
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