A CELL OR BATTERY WITH A METAL LITHIUM ELECTRODE AND ELECTROLYTES THEREFOR

摘要

Electrolyte for rechargeable batteries with a negative electrode (anode) made of lithium or lithium containing alloys comprising : one or several non-aqueous organic solvents, one or several lithium salts and one or several additives increasing the cycle life of the lithium electrode. Wherein the electrolyte additives are lithium polysulfides having the formula Li2Sn. A battery comprising such an electrolyte and with a negative electrode made of lithium or lithium containing alloys and a positive electrode made of metallic lithium or a second lithium containing alloy. The electrolyte solution may comprise at least one solvent or several solvents selected from the group comprising : tetrahydrofurane, 2-methyltetrahydrofurane, dimethylcarbonate, diethylcarbonate ethylmethylcarbonate, methylpropylcarbonate, methylpropylpropyonate ethylpropylpropyonate, methylacetate, ethylacetate, propylacetate, dimetoxyethane 1,3-dioxalane, diglyme (2-methoxyethil ether), tetraglyme, ethylenecarbonate propylencarbonate, ?-butyrolactone, and sulfolane. The electrolyte solution may further comprise at least one salt or several salts selected from the group consisting of lithium hexafluorophosphate (LiPF₆), lithium hexafluoroarsenate (LiAsF₆), lithium perchlorat (LiCIO₄), lithium sulfonylimid trifluoromethane (LiN(CF₃SO₂)₂)) and lithium trifluorosulfonate (CF₃SO₃Li) or other lithium salts or salts of another alkali metal or a mixture thereof.