The present invention provides an alkali metal salt of fluorosulfonyl imide having favorable heat resistance and a reduced content of specific impurities and a water content, and provides a method for producing an alkali metal salt of fluorosulfonyl imide, which is capable of easily removing a solvent from a reaction solution. An alkali metal salt of fluorosulfonyl imide of the present invention is represented by the following general formula (I) and has a mass loss rate of 2% or less when the alkali metal salt of fluorosulfonyl imide is kept at 100Â° C. for 8 hours under an air current. A method for producing an alkali metal salt of fluorosulfonyl imide of the present invention comprises a step of concentrating a solution of the alkali metal salt of fluorosulfonyl imide by bubbling a gas into a reaction solution containing the alkali metal salt of fluorosulfonyl imide, and/or concentrating a solution of the alkali metal salt of fluorosulfonyl imide by thin layer distillation. [structure]

Claims

16 · 1 independent · depth 5

16 granted claims

›1.independentA composition comprising an alkali metal salt of fluorosulfonyl imide represented by the following formula (I), having a content of sulfate ions (SO42…+15

›2.↳ 1The composition comprising the alkali metal salt of fluorosulfonyl imide according to claim 1, wherein a content of fluoride ions (Fâˆ’) is 1,000 ppm …d2+6

›3.↳ 2The composition comprising the alkali metal salt of fluorosulfonyl imide according to claim 2, wherein a water content is 500 ppm or less.d3+5

›5.↳ 1The composition comprising the alkali metal salt of fluorosulfonyl imide according to claim 1, wherein the alkali metal salt of fluorosulfonyl imide i…d2

›6.↳ 1The composition comprising the alkali metal salt of fluorosulfonyl imide according to claim 1, wherein the alkali metal salt of fluorosulfonyl imide i…d2

›11.↳ 1A method for producing an alkali metal salt of fluorosulfonyl imide described in claim 1, comprising a step ofnconcentrating a solution of an alkali m…d2+5

Classifications

10 codes

IPC · International Patent Classification

Section B — Performing operations; transporting

B01D3/34
B01D1/22

Section C — Chemistry; metallurgy

C01B21/093
C01B21/086

Section H — Electricity

H01M10/0568
H01G9/02
H01G9/035
H01M10/052

USPC · US Patent Classification

423/386252/62.2

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Mark Luderer

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Type	Document	Date
related publication	US 20130068991 A1	21 Mar 2013

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