A flexible NASICON-type composite electrolyte for lithium-oxygen/air battery
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Lithium-air/oxygen battery has raised widespread interest due to its extraordinary theoretical energy density (up to 3500 Wh kg−1). In this study, a flexible free-standing NASICON (Na-super ionic conductor)-type hybrid solid-state polymer electrolyte (HSPE) based on PVDF-HFP (poly(vinylidene fluoride-hexafluoropropylene)) copolymer and NASICON LATP (Li1.3Al0.3Ti1.7(PO4)3) was prepared and investigated. The HSPE membranes exhibited an ionic conductivity of 1.02 × 10−4 S cm−1 at room temperature along with a electrochemical window from 2 to 4.5 V. Using the HSPE, a lithium-oxygen/air battery with an inorganic solid-state cathode was fabricated. High initial discharge capacities of 4654 and 5564.3 mAh g−1 were reached under pure O2 and ambient air, respectively. Compared to conventional porous polypropylene (PP) separator, the HSPE membrane alleviated the corrosion of the lithium anode, thus improving the cyclability of the cells. The results presented in this study suggest the great potential application of NASICON-type HSPE membrane in solid-state rechargeable lithium-air/oxygen batteries.
KeywordsComposite electrolyte Flexible membrane Lithium-oxygen/air battery NASICON PVDF-HFP
We thank Mrs.Wang Hui in Analytical and Testing Center of SCU for her help during SEM imaging.
We received financial support from the Natural Science Foundation of China (NSFC 51702223 and 21603154) and Sichuan University Scientific Research Foundation for Young Teachers (No.2015SCU11055).
- 31.Gray FM (1997) Solid polymer electrolytes: fundamentals and technological applications. The Royal Society of Chemistry, LondonGoogle Scholar
- 35.Besenhard J, Yang J, Winter M (1997) Will advanced lithium-alloy anodes have a chance in lithium-ion batteries? J Power Sources 68 (1):87–90Google Scholar