Process for removing acids from lithium salt solutions
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United States of America Patent
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Dec 14, 1999
Grant Date -
N/A
app pub date -
Jun 9, 1997
filing date -
Nov 26, 1996
priority date (Note) -
Expired
status (Latency Note)
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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. The highly pure salts and solutions have a hydrogen fluoride concentration of less than 10 ppm
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