Fluorine-containing cyclic sulfonylimide salt, and method for producing same, non-aqueous electrolyte, non-aqueous secondary battery

2:

• The non-aqueous electrolyte solution according to claim 1, wherein the fluorine-containing cyclic sulfonylimide salt represented by the general formula (1) contains any one of the following formulas (1-1) to (1-5)

3:

• The non-aqueous electrolyte solution according to claim 1, wherein the fluorine-containing sulfonamide compound represented by the general formula (2) is contained in an amount of 0.1 ppm by weight or more relative to the total amount of the non-aqueous electrolyte solution.

4:

• The non-aqueous electrolyte solution according to claim 1, wherein the non-aqueous solvent contains acetonitrile in an amount of 3% by volume or more and 97% by volume or less relative to the total amount of the non-aqueous solvent.

5-6. (canceled)

7:

• The non-aqueous electrolyte solution according to claim 1, wherein the content of the fluorine-containing cyclic sulfonylimide salt represented by the general formula (1) is 0.8 mol or more and 1.5 mol or less relative to 1 L of the non-aqueous solvent.

(canceled)

10:

• The non-aqueous electrolyte solution according to claim 1, wherein the content of the fluorine-containing cyclic sulfonylimide salt represented by the general formula (1) is more than 10 relative to the content of LiPF6, in terms of a molar ratio.

11:

• A non-aqueous secondary battery comprising the non-aqueous electrolyte solution according to claim 1.

(canceled)

15:

• A fluorine-containing cyclic sulfonylimide salt composition comprising a fluorine-containing cyclic sulfonylimide salt represented by the following general formula (1A):
• wherein Rs may be the same or different and R each is a fluorine atom or a trifluoromethyl group, n is an integer of 1 to 4, and M1 is U, Na, K or NH4, wherein
• the temperature at which a mass reduction rate reaches 2% by mass when heated at a temperature rise rate of 10° C./min from 100° C. under nitrogen stream is 385° C. or higher.

16:

• The fluorine-containing cyclic sulfonylimide salt composition according to claim 15, wherein a fluorine-containing sulfonamide compound represented by the following general formula (2):
• H(CR2)m—SO2NHM2 (2)
• wherein Rs may be the same or different and R each is a fluorine atom or a trifluoromethyl group, M2 is U, Na, K, H or NH4, and m is 1 or 2, is contained in an amount of 5,000 ppm by mass or less.

17-19. (canceled)

20:

• The fluorine-containing cyclic sulfonylimide salt composition according to claim 15, wherein the fluorine-containing cyclic sulfonylimide salt is represented by the following formula

23-26. (canceled)

27:

• The method according to claim 21, wherein, in the electrolytic coupling reaction step, the fluorosulfonyl group-containing carboxylic acid compound represented by the general formula (3) is subjected to an electrolytic coupling reaction in the presence of a mixed solvent of water and a nitrile group-containing solvent in which a ratio (β/α) of the mass (α) of water to the mass (β) of the nitrile group-containing solvent is 0.80 or less.

(canceled)

29:

• The method according to claim 21, wherein, in the electrolytic coupling reaction step, the fluorosulfonyl group-containing carboxylic acid compound represented by the general formula (3) is subjected to an electrolytic coupling reaction in a reaction vessel in the presence of a mixed solvent of water and a nitrile group-containing solvent, and
• wherein, during the reaction, the height (distance) TL from the bottom of the reaction vessel to the liquid surface of the reaction solution and the height (distance) TE from the bottom of the reaction vessel to the top of the electrode (highest level) satisfy the relationship TL>TE, and after the reaction, the height (distance) TS from the bottom of the reaction vessel to the interface between the organic phase and the aqueous phase and the height (distance) TE′ from the bottom of the reaction vessel to the bottom of the electrode (lowest level) satisfy the relationship TE′>TS.

(canceled)

31:

• The method according to claim 27, wherein a content of an alkali metal in the reaction solution during the electrolytic coupling reaction is 2,000 ppm by mass or less.

32:

• The method according to claim 27, wherein, in the electrolytic coupling reaction step, a molar ratio of the compound represented by the general formula (5) produced is set at 0.01 or less relative to 1 mol of the formation amount of a bis(fluorosulfonyl) compound (4) represented by the following general formula (4):
• FO2S—(CR2)m—SO2F (4)
• wherein Rs may be the same or different and R each is a fluorine atom or a trifluoromethyl group, and m is 1 or 2.

33:

• The method according to claim 27, wherein, in the electrolytic coupling reaction step, the fluorosulfonyl group-containing carboxylic acid compound represented by the general formula (3) is subjected to an electrolytic coupling reaction in the presence of a mixed solvent of water and a nitrile group-containing solvent, and a ratio (δ/γ) of the mass (δ) of the mixed solvent to the mass (γ) of the fluorosulfonyl group-containing carboxylic acid compound is 1.5 or less.

34:

• The method according to claim 27, wherein, in the electrolytic coupling reaction, a plate spacing between the anode and cathode is 0.001 mm to 9.9 mm.

(canceled)

36:

• The method according to claim 27, wherein the nitrile group-containing solvent is at least one selected from the group consisting of acetonitrile, propionitrile, butyronitrile and benzonitrile.

(canceled)

38:

• The method according to claim 27, wherein the electrolytic coupling reaction is carried out at a reaction temperature within a range of −35° C. or higher and 10° C. or lower.