METHOD FOR PRODUCING LITHIUM TETRAFLUOROBORATE SOLUTION

WIPO Patent Application WO/2013/018784

A1

This method for producing a lithium tetrafluoroborate solution for lithium battery electrolyte solutions comprises: a reaction step wherein lithium fluoride and boron trifluoride are reacted with each other in a chain carbonic acid ester that serves as a solvent, thereby producing lithium tetrafluoroborate and obtaining a reaction solution that is obtained by dissolving the lithium tetrafluoroborate in the solvent; a water removal step wherein a water remover is added into the reaction solution; an acidic impurity removal step wherein acidic impurities are removed by concentrating the reaction solution after the water removal step; and a dilution step wherein the concentrated solution after the acidic impurity removal step is diluted. This production method is capable of providing a method for producing a lithium tetrafluoroborate solution for lithium battery electrolyte solutions, said lithium tetrafluoroborate solution having an acidic impurity concentration reduced to 50 ppm by mass or less and a water concentration reduced to 15 ppm by mass or less.

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SHINMEN MASUTAKA
TSUJIOKA SHOICHI
TAROURA TETSU
SATO KEIJI
MORINAKA TAKAYOSHI

PCT/JP2012/069403

February 07, 2013

July 31, 2012

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CENTRAL GLASS CO LTD (JP)
SHINMEN MASUTAKA
TSUJIOKA SHOICHI
TAROURA TETSU
SATO KEIJI
MORINAKA TAKAYOSHI

H01M10/0568; C01B35/06; H01M10/0569

WO2012023534A1

2012-02-23

JPH11157830A	1999-06-15
JPS56145113A	1981-11-11
JP2000260469A	2000-09-22
JP2001247307A	2001-09-11
JPH11154519A	1999-06-08
JPH09139232A	1997-05-27
JP2001118578A	2001-04-27

See also references of EP 2738861A4

KOBAYASHI, Hiromichi et al. (JP)
Hiromichi Kobayashi (JP)

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