Method for manufacturing electrolyte solution material

Patent metadata

Field	Value
Publication number	US-11539078-B2
Application number	US-202017074416-A
Country	US
Kind code	B2
Filing date	Oct 19, 2020
Priority date	Oct 3, 2014
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

An electrolytic solution comprising N-(fluorosulfonyl)-N-(fluoroalkylsulfonyl)imide or di(fluorosulfonyl)imide, from which a residual solvent that affects the properties of the electrolyte solution material is reduced, is provided. A method for producing an electrolyte solution material containing fluorosulfonyl imide salt represented by the following general formula (1) and an electrolyte solution preparation solvent comprises decompressing and/or heating a solution containing the fluorosulfonyl imide salt and the electrolyte solution preparation solvent to volatilize a production solvent for the fluorosulfonyl imide salt.

In general formula (1), R 1 represents a fluorine atom or a fluorinated alkyl group having 1 to 6 carbon atoms, R 2 represents an alkali metal ion.

First claim

The invention claimed is:

1. A method for producing an electrolyte solution containing a fluorosulfonyl imide salt represented by the following general formula (1) and an electrolyte solution solvent, said method comprising decompressing and/or heating a solution containing the fluorosulfonyl imide salt, the electrolyte solution solvent and a fluorosulfonyl imide salt production solvent to volatilize the fluorosulfonyl imide salt production solvent,

wherein: R1 represents a fluorine atom or fluorinated alkyl group having 1 to 6 carbon atoms; R2 represents an alkali metal ion; and the electrolyte solution solvent is at least one selected from the group consisting of a carbonate-based solvent, a linear ether-based solvent, and a cyclic ester based solvent,
thereby producing the electrolyte solution,
wherein the fluorosulfonyl imide salt production solvent is at least one selected from the group consisting of an alcohol-based solvent, a carboxylic acid-based solvent, a ketone, a nitrile-based solvent, an ester-based solvent, an aliphatic ether-based solvent, a halogen-based solvent, a nitro-group-containing solvent, a nitrogenated organic solvent, and a glyme-based solvent, and
wherein a reduced pressure in the volatilization step is 200 kPa or less, and a volatilization temperature is 20° C. to 60° C.

2. The method for producing the electrolyte solution according to claim 1 , wherein the electrolyte solution solvent is a carbonate-based solvent.

3. The method for producing the electrolyte solution according to claim 1 , wherein the electrolyte solution solvent is at least one selected from the group consisting of a dimethyl carbonate, an ethylmethyl carbonate and a diethyl carbonate.

4. The method for producing the electrolyte solution according to claim 1 , wherein a concentration of the fluorosulfonyl imide salt contained in the electrolyte solution is 30 mass % or more.

5. The method for producing the electrolyte solution according to claim 1 , wherein a residual amount of the fluorosulfonyl imide salt production solvent contained in the electrolyte solution is 500 ppm or less.

6. A method for producing a non-aqueous electrolyte solution, comprising mixing the electrolyte solution produced by the above-mentioned method according to claim 1 with a non-aqueous electrolyte solution preparation solvent.

7. The method for producing the electrolyte solution according to claim 1 , the electrolyte solution has a liquid form.

Assignees

• Nippon Catalytic Chem Ind

Inventors

• Okumura Yasunori
• Sato Shimpei
• Okajima Masayuki
• Kobatake Takayuki
• Katsuyama Hiromoto

Classifications

• H01M10/0568 Primary

  characterised by the solutes · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2300/0028

  characterised by the solvent · CPC title

• C01B21/086 Primary

  containing one or more sulfur atoms · CPC title