PEO-NaPF6 Blended Polymer Electrolyte for Solid State Sodium Battery

Solid-state polymer electrolytes (SPEs) are proposed as promising candidates for application in sodium batteries to replace the organic liquid electrolytes for enhanced safety. In this study, we first verified the feasibility of PEO-NaPF6 SPE in solid-state sodium batteries (SSBs). The explored PEO-NaPF6 SPEs exhibit a relatively high ionic conductivity of similar to 6.3 x 10(-4) S cm(-1) at 80 degrees C, a large Na+ transference number (t(Na+)) of 0.58, and sufficient thermal stability at around 200 degrees C for SSBs. More importantly, the PEO-NaPF6 SPEs afford excellent long-term cycling performances for the Na parallel to Na3V2(PO4)(3)@C cell at 80 degrees C (85.8% capacity retention at 2 degrees C after 200 cycles) and the Na parallel to NaNi2/Cu-9(1)/9Fe1/3Mn1/3O2 cell at 80 degrees C (77% capacity retention at 0.5 degrees C after 100 cycles). All of the properties make the PEO-NaPF6 SPE a potential alternative for application in SSBs. (C) 2020 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited. This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives 4.0 License (CC BYNC-ND, http://creativecommons.orelicenses/by-nc-nd14.0/), which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in any way and is properly cited. For permission for commercial reuse please email: oa@.electrochem.org