The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 31, 2016
Filed:
Jul. 31, 2012
Masutaka Shinmen, Sanyoonoda, JP;
Shoichi Tsujioka, Iruma-gun, JP;
Tetsu Taroura, Iruma-gun, JP;
Keiji Sato, Ube, JP;
Takayoshi Morinaka, Ube, JP;
Masutaka Shinmen, Sanyoonoda, JP;
Shoichi Tsujioka, Iruma-gun, JP;
Tetsu Taroura, Iruma-gun, JP;
Keiji Sato, Ube, JP;
Takayoshi Morinaka, Ube, JP;
Central Glass Company, Limited, Ube-shi, JP;
Abstract
Disclosed is a production method of a lithium tetrafluoroborate solution for use as a lithium battery electrolytic solution, including: a reaction step of forming lithium tetrafluoroborate by reaction of lithium fluoride and boron trifluoride in a chain carbonate ester solvent and thereby obtaining a reaction solution of the lithium tetrafluoroborate dissolved in the chain carbonate ester solvent; a water removal step of adding a water removing agent to the reaction solution; an acidic impurity removal step of removing an acidic impurity component from the reaction solution by concentrating the reaction solution after the water removal step; and a dilution step of diluting the concentrated solution after the acidic impurity removal step. It is possible by this method to obtain the lithium tetrafluoroborate solution whose acidic impurity content and water content are reduced to be 50 mass ppm or lower and 15 mass ppm or lower, respectively.