Journal
NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-11960-w
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Funding
- National Key Research Program [2018YFB0905400]
- National Natural Science Foundation of China [51672156, 51622210, 51872277, 51802361]
- Local Innovative Research Teams Project of Guangdong Pearl River Talents Program [2017BT01N111]
- Guangdong special support program [2015TQ01N401]
- Guangdong Province Technical Plan Project [2017B010119001, 2017B090907005]
- Shenzhen Technical Plan Project [JCYJ20170412170706047, JCYJ20170307153806471, JCYJ20170817161221958]
- DNL cooperation Fund, CAS [DNL180310]
- U.S. Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office
- DOE Office of Science [DE-AC02-06CH11357]
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Sodium metal batteries have potentially high energy densities, but severe sodium-dendrite growth and side reactions prevent their practical applications, especially at high temperatures. Herein, we design an inorganic ionic conductor/gel polymer electrolyte composite, where uniformly cross-linked beta alumina nanowires are compactly coated by a poly (vinylidene fluoride-co-hexafluoropropylene)-based gel polymer electrolyte through their strong molecular interactions. These beta alumina nanowires combined with the gel polymer layer create dense and homogeneous solid-liquid hybrid sodium-ion transportation channels through and along the nanowires, which promote uniform sodium deposition and formation of a stable and flat solid electrolyte interface on the sodium metal anode. Side reactions between the sodium metal and liquid electrolyte, as well as sodium dendrite formation, are successfully suppressed, especially at 60 degrees C. The sodium vanadium phosphate/sodium full cells with composite electrolyte exhibit 95.3% and 78.8% capacity retention after 1000 cycles at 1C at 25 degrees C and 60 degrees C, respectively.
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