Back to results
US 6,280,881 B1Granted
Lithium secondary battery
AssigneeDanionics A/S
InventorsAsa Wendsjo, Steen Yde-Andersen
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeDanionics A/S
InventorsAsa Wendsjo, Steen Yde-Andersen
Estimating the term…
A lithium secondary battery with an electrolyte containing one or more alkai metal salts, one or more non-aqueous solvents and immobilized by a polymer selected from cellulose acetates, cellulose acetate butyrates, cellulose acetate propionates, polyvinylidene fluoride-hexafluoropropylenes and polyvinylpyrrolidone-vinyl acetates, the polymer preferably being used in an amount of at most 15% by weight based on the weight of the salts, solvents and polymer of the electrolyte system, with the proviso that in the case of polyvinlidene fluoride-hexafluoropropylenes, the polymer is present in an amount of at most 12% by weight based on the weight of the salts, solvents and polymer of the electrolyte system. The immobilized electrolyte does not cause problems with respect to leakage from the cell compartment and the elctrolyte also high conductivity implying a capacity utilization more closely approaching the utilization observed for batteries using liquid electrolyte. The electrolyte is also electrochemically stable.
A lithium secondary battery comprising an immobilized electrolyte containing one or more alkali metal salts, one or more non-aqueous solvents and an immobilizing polymer, wherein the immobilizing polymer is selected from the group consisting of cellulose acetates, cellulose acetate butyrates, cellulose acetate propionates, and polyvinylidene fluoride-hexafluoropropylenes with the proviso that in the case of polyvinylidene fluoride-hexafluoropropylenes, the polymer is present in an amount or at most 12% by weight based on the weight of the salts, solvents and polymer of the electrolyte system.
A method of immobilizing an electrolyte in a lithium secondary battery comprising an electrolyte system which includes salts, solvents and polymer, said method comprising combining the electrolyte with a polymer selected from the group consisting of cellulose acetates, cellulose acetate butyrates, cellulose acetate propionates and polyvinylidene fluoride-hexafluoropropylenes with the proviso that when the polymer is polyvinylidene fluoride-hexafluoropropylenes, the polymer is present in an amount of at most 12% by weight based on the weight of the salts, solvents and polymer of the electrolyte system.
Dependencies are inferred from the claim text.