Method for producing difluorophosphate, nonaqueous...

Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Include electrolyte chemically specified and method

Reexamination Certificate

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C423S301000, C429S199000, C429S338000, C429S342000

Reexamination Certificate

active

08076033

ABSTRACT:
The present invention provides a simple method for producing a difluorophosphate from a source material, the difluorophosphate being useful as additives for nonaqueous electrolyte solutions for secondary batteries. In the method, a source material containing a carbonate and/or a borate is allowed to react with a source gas which contains P and F and which may further contain O as required. The source material may contain lithium carbonate. The source gas may be produced by decomposing LiPF6. The source gas may be produced in such a manner that LiPF6and lithium carbonate are mixed and then subjected to reaction. The nonaqueous electrolyte solution contains the product obtained from the reaction.

REFERENCES:
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patent: 5393506 (1995-02-01), Swidersky et al.
patent: 6210830 (2001-04-01), Sartori et al.
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patent: 11-67270 (1999-03-01), None
patent: 11 67270 (1999-03-01), None
patent: 3439085 (2003-06-01), None
patent: 2004 31079 (2004-01-01), None
English Abstract of JP 2004-31079 published on Jan. 29, 2004.
P. Vast, A. Semmound, A. Addou and G. Palavit, “Methodological study of the synthesis of metal difluorodioxophosphates from phosphoryl difluoride oxide”, Journal of Fluorine Chemistry, 38 (1988) 297-302. (w/English Translation).
R. C. Thompson and W. Reed, Inorganic. Nucl. Chem. Letters vol. 5, pp. 581-585, 1969, “Preparation and infrared spectra of alkali metal difluorophosphates” Department of Chemistry, University of British Columbia, Vancouver, B.C., Canada.
Santad Kongpricha and William C. Preusse, “The Preparation and Some Reactions of Phosphoramidic Difluoride”, vol. 6, No. 10, Oct. 1967, p. 1915-1917.

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