Method for producing phosphoryl imide salt, method for producing nonaqueous electrolyte solution containing said salt, and method for producing nonaqueous secondary battery

A method for producing a nonaqueous electrolyte solution, which comprises the steps of:

• (1) performing cation exchange by bringing a phosphoryl imide salt represented by the following general formula (2) into contact with a cation exchange resin having M1 n+ or a metal salt represented by the general formula (4) in an organic solvent having a water content of 0.3% by mass or less, so as to produce a phosphoryl imide salt represented by the following general formula (1):
• wherein M1 n+ is an alkali metal cation, an alkaline earth metal cation, a quaternary ammonium cation or a quaternary phosphonium cation,
• M2 n+ any one of an alkali metal cation, an alkaline earth metal cation, a quaternary ammonium cation, a tertiary ammonium cation (a protonated form of a tertiary organic amine base), or a mixture thereof,
• a cation M1 n+ of the product is different from a cation M2 n+ of the raw material,
• N is a nitrogen atom, P is a phosphorus atom, and X is a sulfur atom or a phosphorus atom,
• n is 1 or 2,
• when X is a sulfur atom, m is 2 and R4 is absent,
• when X is a phosphorus atom, m is 1,
• B is a chloride ion a sulfate ion a sulfonate ion or a carbonate ion, and
• R1, R2, R3 and R4 are each independently selected from a fluorine atom, an alkyl group, an alkoxy group, an alkenyl group, an alkenyloxy group, an alkynyloxy group and an aryloxy group;
• and
• (2) dissolving at least the resultant phosphoryl imide salt and a solute in a nonaqueous solvent.

A method for producing a nonaqueous secondary battery, which comprises the steps of:

• (1) performing cation exchange by bringing a phosphoryl imide salt represented by the following general formula (2) into contact with a cation exchange resin having M1 n+ or a metal salt represented by the general formula (4) in an organic solvent having a water content of 0.3% by mass or less, so as to produce a phosphoryl imide salt represented by the following general formula (1):
• wherein M1 n+ is an alkali metal cation, an alkaline earth metal cation, a quaternary ammonium cation or a quaternary phosphonium cation,
• M2 n+ is any one of an alkali metal cation, an alkaline earth metal cation, a quaternary ammonium cation, a tertiary ammonium cation (a protonated form of a tertiary organic amine base), or a mixture thereof,
• a cation M1 n+ of the product is different from a cation M2 n+ of the raw material,
• N is a nitrogen atom, P is a phosphorus atom, and X is a sulfur atom or a phosphorus atom,
• n is 1 or 2,
• when X is a sulfur atom, m is 2 and R4 is absent,
• when X is a phosphorus atom, m is 1,
• B is a chloride ion, a sulfate ion, a sulfonate ion or a carbonate ion, and
• R1, R2, R3 and R4 are each independently selected from a fluorine atom, an alkyl group, an alkoxy group, an alkenyl group, an alkenyloxy group, an alkynyloxy group and an aryloxy group,
• (2) dissolving at least the resultant phosphoryl imide salt and a solute in a nonaqueous solvent, so as to produce a nonaqueous electrolyte solution;
• and
• (3) fabricating a nonaqueous secondary battery comprising a positive electrode, a negative electrode and the resultant nonaqueous electrolyte solution.