An electrochemical cell comprising: - at least one anode comprising metallic lithium or a lithium alloy or at least one anode comprising a current collector at least partially covered with metallic lithium deposited after at least one charge of the cell, the cell not containing metallic lithium at the time of its manufacture, - at least one cathode, - a liquid or gelled electrolyte composition comprising: a) a solvent comprising: i) either a mixture of 1,1,1,3,3,3-hexafluoro-2-methoxypropane (HFMP) and/or 1, 1,1,3,3,3-hexafluoro-2-(fluoromethoxy)propane (HFMFP), ethylene monofluorocarbonate (F1EC) and 2,2,2-trifluoroethyl methyl carbonate (F3EMC), ii) or a mixture of 1,1,1,3,3,3-hexafluoro-2-methoxypropane (HFMP) and/or 1,1,1,3,3,3-hexafluoro-2-(fluoromethoxy)propane (HFMFP), ethylene monofluorocarbonate (F1EC) and 2,2,2-trifluoroethyl acetate (F3EA), b) at least one salt whose cation is the lithium cation, c) lithium difluorophosphate LiPO 2 F 2, and optionally one or more additives selected from the group consisting of a lithium fluorinated phosphate, an alkylated lithium phosphate, the hydrogen atoms of the alkyl group(s) optionally being partially or totally substituted by fluorine, a sulfate optionally partially or totally substituted by fluorine, a sulfonate optionally partially or totally substituted by fluorine, a sulfoxide optionally partially or totally substituted by fluorine, a sulfone optionally partially or totally substituted by fluorine, a cyclic carbonate comprising at least one unsaturation and a mixture thereof, the amount of lithium difluorophosphate representing from 0.05 to 5% of the mass of the combination made up of the solvent and said at least one dissolved lithium salt, the total amount of lithium difluorophosphate and of the additive(s) representing at most 10% of the mass of the combination made up of the solvent and said at least one dissolved lithium salt. - at least one anode comprising metallic lithium or a lithium alloy or at least one anode comprising a current collector at least partially covered with metallic lithium deposited after at least one charge of the cell, the cell not containing metallic lithium at the time of its manufacture, - at least one cathode, - a liquid or gelled electrolyte composition comprising: a) a solvent comprising: i) either a mixture of 1,1,1,3,3,3-hexafluoro-2-methoxypropane (HFMP) and/or 1, 1,1,3,3,3-hexafluoro-2-(fluoromethoxy)propane (HFMFP), ethylene monofluorocarbonate (F1EC) and 2,2,2-trifluoroethyl methyl carbonate (F3EMC), ii) or a mixture of 1,1,1,3,3,3-hexafluoro-2-methoxypropane (HFMP) and/or 1,1,1,3,3,3-hexafluoro-2-(fluoromethoxy)propane (HFMFP), ethylene monofluorocarbonate (F1EC) and 2,2,2-trifluoroethyl acetate (F3EA), b) at least one salt whose cation is the lithium cation, c) lithium difluorophosphate LiPO 2 F 2, and optionally one or more additives selected from the group consisting of a lithium fluorinated phosphate, an alkylated lithium phosphate, the hydrogen atoms of the alkyl group(s) optionally being partially or totally substituted by fluorine, a sulfate optionally partially or totally substituted by fluorine, a sulfonate optionally partially or totally substituted by fluorine, a sulfoxide optionally partially or totally substituted by fluorine, a sulfone optionally partially or totally substituted by fluorine, a cyclic carbonate comprising at least one unsaturation and a mixture thereof, a) a solvent comprising: i) either a mixture of 1,1,1,3,3,3-hexafluoro-2-methoxypropane (HFMP) and/or 1, 1,1,3,3,3-hexafluoro-2-(fluoromethoxy)propane (HFMFP), ethylene monofluorocarbonate (F1EC) and 2,2,2-trifluoroethyl methyl carbonate (F3EMC), ii) or a mixture of 1,1,1,3,3,3-hexafluoro-2-methoxypropane (HFMP) and/or 1,1,1,3,3,3-hexafluoro-2-(fluoromethoxy)propane (HFMFP), ethylene monofluorocarbonate (F1EC) and 2,2,2-trifluoroethyl acetate (F3EA), i) either a mixture of 1,1,1,3,3,3-hexafluoro-2-methoxypropane (HFMP) and/or 1, 1,1,3,3,3-hexafluoro-2-(fluoromethoxy)propane (HFMFP), ethylene monofluorocarbonate (F1EC) and 2,2,2-trifluoroethyl methyl carbonate (F3EMC), ii) or a mixture of 1,1,1,3,3,3-hexafluoro-2-methoxypropane (HFMP) and/or 1,1,1,3,3,3-hexafluoro-2-(fluoromethoxy)propane (HFMFP), ethylene monofluorocarbonate (F1EC) and 2,2,2-trifluoroethyl acetate (F3EA), b) at least one salt whose cation is the lithium cation, c) lithium difluorophosphate LiPO 2 F 2, and optionally one or more additives selected from the group consisting of a lithium fluorinated phosphate, an alkylated lithium phosphate, the hydrogen atoms of the alkyl group(s) optionally being partially or totally substituted by fluorine, a sulfate optionally partially or totally substituted by fluorine, a sulfonate optionally partially or totally substituted by fluorine, a sulfoxide optionally partially or totally substituted by fluorine, a sulfone optionally partially or totally substituted by fluorine, a cyclic carbonate comprising at least one unsaturation and a mixture thereof, the amount of lithium difluorophosphate representing from 0.05 to 5% of the mass of the combination made up of the solvent and said at least one dissolved lithium salt, the total amount of lithium difluorophosphate and of the additive(s) representing at most 10% of the mass of the combination made up of the solvent and said at least one dissolved lithium salt.