Process for removing acids from lithium salt solutions
AssigneeFMC Corporation
InventorsDennis J. Salmon, D. Wayne Barnette
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Abstract
The present invention provides a process for generating acid-free lithium salt solutions for lithium and lithium ion batteries and for preparing high purity lithium salts. The invention comprises removing acid species from lithium salt solutions such as lithium hexafluorophosphate solutions using weak base resins. The process does not require the addition of a base such as ammonia which when added to the electrolytic solution generally must be removed from the final product. Once the lithium salt has been treated by the weak base resin, the substantially acid-free lithium salt solution may be recovered from the weak base resin to provide a solution which may be used as an electrolytic solution or which may be used to prepare high purity lithium salts.
Claims16
A process for removing acids from a lithium salt solution comprising contacting a lithium salt solution comprising a lithium salt, a solvent, and at least one acid species, with a weak base resin to remove the acid species from the lithium salt solution.
An electrochemical cell comprising:
- a positive electrode;
- a negative electrode;
- and
- an electrolytic solution consisting essentially of a fluorine-containing lithium salt and a solvent, wherein the amount of hydrogen fluoride present in the solution is no more than about 10 ppm.
Dependencies are inferred from the claim text.