Additive for enhancing the performance of electrochemical cells
First Claim
1. An electrolyte for a battery, said electrolyte comprising:
- a non-aqueous solvent; and
a salt mixture, said salt mixture comprising an alkali metal electrolyte salt and an additive salt combination comprising a first additive salt having a first additive anion of bis(oxalato) borate and a second additive salt having a second additive anion of oxalyldifluoroborate.
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Accused Products
Abstract
A lithium battery includes an electrolyte comprised of a non-aqueous solvent, and a salt mixture. The salt mixture includes an alkali metal electrolyte salt and an additive salt having an anion of a mixed anhydride of oxalic acid and boric acid. Specific additive salts include lithium bis(oxalato) borate and lithium oxalyldifluoroborate. Particular electrolyte salts comprise LiPF6 and LiBF4. The additive salt is present in an amount of 0.1–60 mole percent of the total of the additive salt and electrolyte salt content of the electrolyte. Also disclosed is a method for enhancing the performance characteristics of a lithium battery through the use of the electrolyte composition. Also disclosed is the compound lithium oxalyldifluoroborate.
98 Citations
14 Claims
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1. An electrolyte for a battery, said electrolyte comprising:
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a non-aqueous solvent; and a salt mixture, said salt mixture comprising an alkali metal electrolyte salt and an additive salt combination comprising a first additive salt having a first additive anion of bis(oxalato) borate and a second additive salt having a second additive anion of oxalyldifluoroborate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification