Specific electrochemical cell for accumulator operating according to the principle of forming an alloy with the active material of the negative electrode comprising a specific pair of electrodes

An electrochemical cell comprising:

• a negative electrode comprising an active material comprising a material alloyable with an element M, wherein M comprises an alkali element or an alkaline earth element;
• a positive electrode comprising an active material comprising a conversion material;
• and
• an electrolyte solution comprising at least one salt of M disposed between the negative electrode and the positive electrode;
• and wherein
• during a charging process, the active material of the negative electrode forms an alloy with M of the salt of M of the electrolyte solution,
• the electrolyte solution comprising a liquid solvent comprising one or more organic solvents, at least one salt of M, and one or more additives selected from the group consisting of vinylidene carbonate, fluoroethylene carbonate and mixtures thereof, each additive being comprised in the electrolyte solution at a content not exceeding 10% by mass of the total mass of the electrolyte solution.