Polymer electrolytes based on new aryl-containing lithium perfluorosulfonates

The electrochemical performances of a broad family of new perfluorosulfonate lithium salts bearing an aryl substituent have been investigated. They exhibit, in polymer electrolytes based on POE, high cationic transference numbers, and fairly good cationic conductivities. The electrochemical stability window of some of them is compatible with their use in lithium batteries having lithium metal as negative electrode. The versatility of the syntheses will allow modulating their physico-chemical properties.

The paper gathers new results obtained from a series of aryl-containing lithium perfluorosulfonates dissolved in a macromolecular solvent i.e. poly(oxyethylene). The anion syntheses starting from an aryl sulphide or an aryl ketone, a variety of new salts can be designed by changing the nature of the aryl moiety.Figure optionsDownload as PowerPoint slideHighlights
• New aryl-containing lithium perflurosulfonates lead to high T+ in POE electrolyte.
• New salts have a wide electrochemical stability window.
• Salts including a thioether are stable vs Li metal.
• Salts including a sulfone are instable vs Li metal but highly stable in oxidation.