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

Autor: Xiaoen Wang, Cheng Zhang, Michal Sawczyk, Ju Sun, Qinghong Yuan, Fangfang Chen, Tiago C. Mendes, Patrick C. Howlett, Changkui Fu, Yiqing Wang, Xiao Tan, Debra J. Searles, Petr Král, Craig J. Hawker, Andrew K. Whittaker, Maria Forsyth
Rok vydání: 2022
Předmět:
Zdroj: Nature Materials. 21:1057-1065
ISSN: 1476-4660
1476-1122
DOI: 10.1038/s41563-022-01296-0
Popis: Rechargeable batteries paired with sodium metal anodes are considered to be one of the most promising high-energy and low-cost energy-storage systems. However, the use of highly reactive sodium metal and the formation of sodium dendrites during battery operation have caused safety concerns, especially when highly flammable liquid electrolytes are used. Here we design and develop solvent-free solid polymer electrolytes (SPEs) based on a perfluoropolyether-terminated polyethylene oxide (PEO)-based block copolymer for safe and stable all-solid-state sodium metal batteries. Compared with traditional PEO SPEs, our results suggest that block copolymer design allows for the formation of self-assembled nanostructures leading to high storage modulus at elevated temperatures with the PEO domains providing transport channels even at high salt concentration (ethylene oxide/sodium = 8/2). Moreover, it is demonstrated that the incorporation of perfluoropolyether segments enhances the Na
Databáze: OpenAIRE
Externí odkaz: