Lithium salts based on a series of new anilinyl-perfluorosulfonamide salts and their polymer electrolytes

• Published in: Journal of power sources Vol. 364; pp. 138 - 147
• Main Authors: Thiam, A., Iojoiu, C., Leprêtre, J.-C., Sanchez, J.-Y.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.2017
• Subjects: Anodic stability; Linear Free Energy Relationship; Lithium salts; POE/PEO; Polymer electrolytes; Anodic stability; Linear Free Energy Relationship; Lithium salts; Polymer electrolytes; POE/PEO
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2017.07.104

Polymer electrolytes based on a series of new lithium anilinyl-perfluorosulfonamide exhibit conductivities close to LiTFSI ones and higher cationic transference numbers. Taking advantage of an extended delocalization on the negative charge, the anodic stability of the salts was found to range between 4.2 and 4.9 V vs Li/Li+, according to the electron-withdrawing group EWG located in para/ortho position. The simplicity of the synthesis process of the new salts, with lower fluorine content than LiPF6 and LiTFSI, paves the way for a further semi-pilot scale-up. Moreover, Linear Free Energy Relationships, LFER, were established for the first time, for both ionic conductivity and anodic stability. These LFER demonstrate unambiguously and quantitatively the conductivity dependence on anion basicity. Polymer electrolytes were soundly investigated through a variety of physicochemical and electrochemical characterizations. •Impact of extended anion charge delocalization on conductivities and anodic stability.•Close conductivities between new fluorine-less electrolytes and PEO/LiTFSI.•First it was shown a Linear Free Energy Relationships and anodic stabilities.•The easy syntheses of salts pave the way for a possible scale up.