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AssigneeMitsubishi Chemical Corporation
InventorsRyoichi Kato, Hitoshi Suzuki
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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 LiPF6 and lithium carbonate are mixed and then subjected to reaction. The nonaqueous electrolyte solution contains the product obtained from the reaction.
A method for producing a difluorophosphate, comprising bringing a source gas into contact with a source material containing at least one selected from the group consisting of a carbonate and a borate,
A method for producing a difluorophosphate, comprising a step of mixing LiPF6 with a source material containing at least one selected from the group consisting of a carbonate and a borate, and then heating the mixture.
A nonaqueous electrolyte solution for secondary batteries, containing a nonaqueous solvent and an electrolyte lithium salt dissolved therein, wherein the electrolyte lithium salt contains a hexafluorophosphate and a difluorophosphate and a portion of the difluorophosphate is produced by at least one method selected from the group consisting of
Dependencies are inferred from the claim text.