Rechargeable lithium electrochemical cell
AssigneeSaft
InventorsBernard Simon, Jean-Pierre Boeuve
Life of this patent
Estimating the term…
Abstract
The present invention concerns a rechargeable lithium electrochemical cell comprising an anode containing a carbon-containing material with a degree of crystallinity which is greater than 0.8 and an electrolyte comprising a lithium salt and a mixture of at least two aprotic organic solvents, of which the first solvent has a high dielectric constant and the second solvent has low viscosity. The electrolyte further contains a soluble compound of the same type as at least one of said solvents and contains at least one unsaturated bond, and which can be reduced at the anode at a potential of more than 1 volt with respect to lithium to form a passivation layer.
Claims14
A rechargeable lithium electrochemical cell comprising:
- a cathode,
- an anode containing a carbon-containing material with a degree of crystallinity which is greater than 0.8 and
- an electrolyte comprising a lithium salt and a mixture of at least two aprotic saturated organic solvents wherein at least one of the two solvents contains a carbonate, of which the first solvent has a high dielectric constant and the second solvent has low viscosity and is selected from the group consisting of an ether, a diethyl carbonate, a dimethyl carbonate, a dioxolane, a dioxolane derivative, a tetrahydrofuran, a tetrahydrofuran derivative, and a propylene oxide, characterized in that the electrolyte further contains a soluble compound which is a carbonate containing at least one unsaturated carbon-carbon bond, and which can be reduced at the anode at a potential of more than 1 volt with respect to lithium to form a passivation layer.
Dependencies are inferred from the claim text.