Method for preparing non-aqueous electrolytes
AssigneeDuracell Inc.
InventorWilliam L. Bowden
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Abstract
This invention relates to an improved method for preparing a non-aqueous electrolyte comprising lithium hexafluorophosphate, LiPF.sub.6, and electrochemical cells containing same. In particular the method involves forming LiPF.sub.6 by a chemical reaction in the presence of an ether, whereby a complex of LiPF.sub.6 and the ether is formed and readily isolated. An electrolyte is prepared by dissolving the complex in non-aqueous solvents to the desired concentration.
Claims17
A method for preparing an improved electrolyte containing LiPF.sub.6 for use in an electrochemical cell comprising dissolving a salt, having a cation comprising an adduct of a proton and a Lewis base, and an anion comprising PF.sub.6.sup.-, in a solvent comprising an ether capable of forming an isolatable complex with LiPF.sub.6 ;
- adding a lithium base to the solution whereby LiPF.sub.6 and the complex of LiPF.sub.6 and ether are formed simultaneously;
- and isolating the LiPF.sub.6 -ether complex.
A method for preparing an improved electrolyte containing LiPF.sub.6 for use in an electrochemical cell comprising dissolving NH.sub.4 PF.sub.6 in a solvent comprising 1,2-dimethoxyethane;
- adding lithium hydride thereto whereby LiPF.sub.6 and a complex of LiPF.sub.6 and 1,2-dimethoxyethane are formed simultaneously;
- and isolating the LiPF.sub.6 -1,2-dimethoxyethane complex.
Dependencies are inferred from the claim text.