Ionic compound with low melting point has cation of the onium type with at least one heteroatom such as N, O, S or P; and anion which includes, wholly or partially, at least one imide ion. Independent claims are also included for: (1) electrolytic composit...

Optimization of the interface of a negative electrode in an electrochemical device comprising a negative electrode, electrolyte and a positive electrode. Optimization of the interface of a negative electrode in an electrochemical device comprising a negati...