Process for the preparation of LiBF4

Details Process for the preparation of LiBF4 Process for the preparation of LiBF4

2001-03-28

2003-09-23

Nguyen, Ngoc-Yen (Department: 1754)

Chemistry of inorganic compounds

Boron or compound thereof

C423S462000

Reexamination Certificate

active

06623717

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a process for the preparation of LiBF
4
.
BACKGROUND OF THE INVENTION
LiBF
4
has very useful applications in high voltage lithium primary/secondary cells. LiBF
4
is well known as a battery electrolyte. This compound was earlier prepared by procedures, which were cumbersome and the yield was poor. The purity of the sample prepared was poor and needed recrystallization.
U.S. Pat. No. 5,079,109 discloses the use of LiBF
4
as a non-aqueous electrolyte for a lithium battery.
While several methods are known for the preparation of LiBF
4
in the prior art such methods suffer from the following disadvantages:
1. The purity of the product is low
2. The yield of the product is low
3. Ambient temperature reaction for the product yield
4. Side reactions occur
5. Multiplicity of steps are required.
OBJECTS OF THE INVENTION
The main object of this invention is to prepare LiBF
4
by a simple chemical reaction.
Another object of the invention is to obtain LiBF
4
with high yield.
A further object of the invention is to obtain LiBF
4
by an efficient process.
The process of the invention overcomes the disadvantages of the prior art enumerated above.
SUMMARY OF THE INVENTION
Accordingly the present invention relates to a process for the preparation of LiBF
4
reacting LiBO
2
compound with 10 to 48% HF solution in aqueous solution at ambient temperature, concentrating the product and recrystallising to obtain high purity LiBF
4
.
In one embodiment of the invention, LiBO
2
is suspended in aqueous media
onaqueous media and reacted with HF.
In a further embodiment of the invention, a paste of LiBO
2
is added in HF.
In another embodiment of the invention, LiBO
2
is pasted with water and reacted with HF.


REFERENCES:
patent: 2738255 (1956-03-01), Sullivan et al.
patent: 3119654 (1964-01-01), Cunningham
patent: 3178261 (1965-04-01), Lewis et al.
patent: 6537512 (2003-03-01), Friedrich et al.

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