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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 nonaqueous electrolyte solution comprising a nonaqueous solvent, a hexafluorophosphate, difluorophosphate, and fluoride dissolved therein.
A nonaqueous electrolyte solution comprising a nonaqueous solvent, a hexafluorophosphate, difluorophosphate, and carbon dioxide dissolved therein.
A nonaqueous electrolyte solution comprising a nonaqueous solvent, a hexafluorophosphate, and lithium difluorophosphate dissolved therein, wherein the nonaqueous solvent comprises a cyclic carbonate and a linear carbonate, and wherein a PO3F content and PO4 content are less than or equal to one weight percent of the non-metal component weight, and wherein the nonaqueous electrolyte solution comprises at least one further component selected from the group consisting of fluoride and carbon dioxide.
Dependencies are inferred from the claim text.