Na Reactivity toward Carbonate-Based Electrolytes: The Effect of FEC as Additive. Issue 10 (1st January 2016)

• Record Type: Journal Article
• Authors: Dugas, R.; Ponrouch, A.; Gachot, G.; David, R.; Palacin, M. R.; Tarascon, J. M.
• Is Part Of: Journal of the Electrochemical Society. Volume 163:Issue 10(2016)
• Page Start: A2333
• Page End: A2339
• Publication Date: 2016-01-01
• Subjects: electrolyte -- FEC -- metal anode -- Na-ion -- polarization; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0981610jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Na-ion batteries have regained attention because they offer sustainability advantages over the Li-ion technology, hence their interest for massive electrochemical storage. Although the Na-ion electrochemistry is analogous to that of the Li-ion concept, there are a few notable differences such as the stability of carbonated-based electrolytes toward the Li or Na metal anodes. Herein we report on the positive effect of FEC as electrolyte additive on the efficiency of Na-half cells which unfortunately comes with a side effect involving the sudden onset of polarization during discharge at unpredictable capacity values. We show that these anomalies, associated to an inefficient plating-stripping at the sodium metal anode, do not appear in full Na-ion cells. Therefore, FEC-based electrolytes are not the panacea and alternative additives must be sought to enable building of reliable half cells with metal anodes.