Mitsubishi Chemical Corporation

Stella Chemifa Corporation

Stella Chemifa Coporation

Kazuhiko Shogami

Tetsuo Nishida

Takashi Fujii

Hideki Nakashima

Megumi Tomisaki

Hirofumi Suzuki

Hirohisa Kikuyama

Masahide Waki

Masayuki Miyashita

Tomoya Satoh

Tomohiko Satonaga

A process for preparing difluorophosphate comprising reacting difluorophosphoric acid with at least one salt, as a raw material, selected from a halide salt, a carbonate, a phosphate, a hydroxide and an oxide of an alkali metal, an alkaline earth metal or an onium in the difluoraphosphoric acid, then separating a precipitate from the difluorophosphoric acid by solid-liquid separation, the precipitate being precipitated by crystallization operation in the difluorophosphoric acid, and removing the difluorophosphoric acid contained in the precipitate by distillation to obtain difluorophosphate.

Method for producing difluorophosphate

To provide a technique for simply and easily producing a high-purity difluorophosphate and provide a production process of an electrolytic solution using the obtained difluorophosphate, an electrolytic solution and a secondary battery. A process for producing a difluorophosphate, comprising the following step (1) or (2): Also, a nonaqueous electrolytic solution containing the obtained difluorophosphate, and a nonaqueous electrolytic secondary battery containing the nonaqueous electrolytic solution.

Production process of difluorophosphate, nonaqueous electrolytic solution and nonaqueous electrolytic secondary battery

A production method of high purity silver tetrafluoroborate, capable of producing silver tetrafluoroborate (AgBF) at purity higher than the conventional, without using an organic solvent. The production method of the present invention is characterized in that the method comprises the step of: reacting silver fluoride with boron trifluoride in the presence of anhydrous hydrofluoric acid. Boron trifluoride is delivered into a solution obtained by dissolving or suspending silver fluoride in an anhydrous hydrofluoric acid solution.

Production method of high purity silver tetrafluoroborate

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Osaka, Japan

Kazuhiko Shogami