Simplified preparation of LiPF.sub.6 based electolyte for non-aqueous batteries
AssigneeMoli Energy (1990) Limited
InventorHuanyu Mao
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Abstract
A simple method is disclosed for preparing LiPF.sub.6 based electrolytes for use in lithium non-aqueous batteries. LiPF.sub.6 is synthesized in a mixture of solvents employed in the electrolyte itself. Using the invention method, residual reactants and by-products of the reaction are easily removed to a required level for practical battery applications while the LiPF.sub.6 remains in solution. The method is suitable for preparing electrolytes for lithium ion batteries wherein solvents such as diethylcarbonate, ethylene carbonate, and propylene carbonate are employed.
Claims14
A method of preparing an electrolyte containing LiPF.sub.6 in solution comprising:
- (a) reacting a salt having a formula (XH).sup.+ PF.sub.6.sup.-, wherein (XH).sup.+ denotes a cation comprising an adduct of a proton (H.sup.+) and a Lewis base (X), with a lithium base in a solvent to be employed in the electrolyte that does not form a LiPF.sub.6 salt or complex, so that LiPF.sub.6 is formed in solution;
- (b) removing residual reactants and by-products of the reaction while the LiPF.sub.6 remains in solution, with no recrystallization or isolation of a LiPF.sub.6 solvent salt or complex;
- and
- (c) adding additional required solvents employed in the electrolyte, so that an LiPF.sub.6 electrolyte is provided that is suitable for use in lithium ion-type batteries without additional processing.
Dependencies are inferred from the claim text.