Patent ID: 6824754
Filing Date: 2004-11-30
Classification: C01D

Abstract:
A solid state thermal process for synthesis of lithium hexafluoro phosphate (LiPF6), which comprises the steps of:(a) mixing a lithium source selected from the group consisting of a lithium oxide, a lithium salt and a combination thereof with diammonium phosphate in equimolar proportions to obtain a first mixture; (b) heating the first mixture in a furnace at a first temperature in the range of 150Â° C. to 600Â° C. continuously to obtain product lithium meta phosphate (LiPO3); (c) cooling and powdering the product LiPO3; and (d) mixing the powdered product LiPO3 with six to nine times quantitatively of ammonium fluoride to form a second mixture and then heating the second mixture at a second temperature in the range of 150Â° C. to 200Â° C. to obtain lithium hexafluoro phosphate.