WO2011065502A1 - フルオロスルホニルイミド塩およびフルオロスルホニルイミド塩の製造方法 - Google Patents
フルオロスルホニルイミド塩およびフルオロスルホニルイミド塩の製造方法 Download PDFInfo
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- WO2011065502A1 WO2011065502A1 PCT/JP2010/071166 JP2010071166W WO2011065502A1 WO 2011065502 A1 WO2011065502 A1 WO 2011065502A1 JP 2010071166 W JP2010071166 W JP 2010071166W WO 2011065502 A1 WO2011065502 A1 WO 2011065502A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0568—Liquid materials characterised by the solutes
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/082—Compounds containing nitrogen and non-metals and optionally metals
- C01B21/087—Compounds containing nitrogen and non-metals and optionally metals containing one or more hydrogen atoms
- C01B21/093—Compounds containing nitrogen and non-metals and optionally metals containing one or more hydrogen atoms containing also one or more sulfur atoms
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/082—Compounds containing nitrogen and non-metals and optionally metals
- C01B21/086—Compounds containing nitrogen and non-metals and optionally metals containing one or more sulfur atoms
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/082—Compounds containing nitrogen and non-metals and optionally metals
- C01B21/087—Compounds containing nitrogen and non-metals and optionally metals containing one or more hydrogen atoms
- C01B21/093—Compounds containing nitrogen and non-metals and optionally metals containing one or more hydrogen atoms containing also one or more sulfur atoms
- C01B21/0935—Imidodisulfonic acid; Nitrilotrisulfonic acid; Salts thereof
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C303/00—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides
- C07C303/36—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of amides of sulfonic acids
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C311/00—Amides of sulfonic acids, i.e. compounds having singly-bound oxygen atoms of sulfo groups replaced by nitrogen atoms, not being part of nitro or nitroso groups
- C07C311/48—Amides of sulfonic acids, i.e. compounds having singly-bound oxygen atoms of sulfo groups replaced by nitrogen atoms, not being part of nitro or nitroso groups having nitrogen atoms of sulfonamide groups further bound to another hetero atom
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a fluorosulfonylimide salt, and more particularly to a salt of N- (fluorosulfonyl) -N- (fluoroalkylsulfonyl) imide, di (fluorosulfonyl) imide and a method for producing the same.
- N- (fluorosulfonyl) -N- (fluoroalkylsulfonyl) imide fluorosulfonylimide salts such as di (fluorosulfonyl) imide and derivatives thereof are represented by N (SO 2 F) group or N (SO 2 F) 2.
- fluorosulfonylimides are obtained by a method of halogen exchange of chlorosulfonylimide using a fluorinating agent (Patent Documents 1 and 2, Non-Patent Documents 1 and 2), or in the presence of urea, HFSO 3 ) is prepared by a method of di (fluorosulfonyl) imide by distillation (Patent Document 3).
- JP 2007-182410 A JP-T-2004-522681 JP-T 8-511274
- the reaction system contains impurities derived from starting materials in addition to the above-mentioned by-products and impurities derived from by-products. From the standpoint of product purity, these impurities are also present. It is a problem that cannot be ignored.
- impurities when impurities are contained in fluorosulfonylimides, the desired characteristics (such as withstand voltage, conductivity, battery characteristics, etc. inherent to FSIs) can be obtained even if these fluorosulfonylimides are used in various applications. There was a problem that it could not be obtained. According to the study by the present inventors, this tendency becomes most noticeable when potassium (K) is contained as an impurity.
- fluorosulfonylimides containing potassium as an impurity are used in the electrolyte of a lithium secondary battery. It has been shown that battery capacity decreases when used. Therefore, when fluorosulfonylimides are used as the electrolyte of an electrochemical device, there is still room for improvement in terms of reducing impurities that cause performance degradation.
- the present invention has been made paying attention to the circumstances as described above, and the object thereof is to provide a method for producing a fluorosulfonylimide salt which can suppress the corrosion and enable continuous operation over a long period of time.
- Fluorosulfonylimide salts with reduced impurity content, especially high-performance electrolytes that do not easily decrease the capacity of electrochemical devices such as secondary batteries, capacitors, capacitors, and solar cells when used as electrolytes It is to provide a fluorosulfonylimide salt).
- the fluorosulfonylimide salt of the present invention that has achieved the above object has a gist where the potassium (K) content is 10,000 ppm or less.
- the fluorosulfonylimide salt of the present invention preferably has an impurity content of FSO 3 NH 2 and / or FSO 3 H of 30000 ppm or less.
- the fluorosulfonylimide salt of the present invention preferably has a Si, B, Fe, Cr, Mo, or Ni content of 1000 ppm or less.
- the total content of one or more metal elements selected from the group consisting of Zn, Cu and Bi is preferably 1000 ppm or less.
- the content of Zn (zinc) is preferably 500 ppm or less.
- the fluorosulfonylimide salt of the present invention preferably has a Cl (chlorine) content of 10,000 ppm or less.
- fluorosulfonylimide salt of the present invention a di (fluorosulfonyl) imide salt is preferable. Moreover, it is a preferred embodiment of the present invention that the fluorosulfonylimide salt is lithium di (fluorosulfonyl) imide.
- the present invention also includes a method for producing a high-purity fluorosulfonylimide salt in which the content of the impurities described above is reduced.
- the production method of the present invention has a gist in that the reaction solution is brought into contact with an alkaline aqueous solution for removing impurities after the fluorination reaction of chlorosulfonylimide or a salt thereof.
- a high-purity fluorosulfonyl salt having a reduced impurity content as described above can be obtained.
- the contact is preferably performed by adding the reaction solution to an alkaline aqueous solution. Further, it is recommended that the reaction solution is brought into contact with an alkaline aqueous solution having a temperature of 5 ° C. to 50 ° C. Further, the amount of the alkaline aqueous solution used is preferably 1 to 100 parts by mass with respect to 100 parts by mass of the reaction solution.
- the embodiment using ammonia water as the alkaline aqueous solution is a recommended embodiment of the present invention.
- fluorosulfonylimide includes di (fluorosulfonyl) imide having two fluorosulfonyl groups, N- (fluorosulfonyl)-having a fluorosulfonyl group and a fluorinated alkyl group. N- (fluoroalkylsulfonyl) imide is included. The same applies to “chlorosulfonylimide” as a starting material.
- Fluoroalkyl means an alkyl group having 1 to 6 carbon atoms in which one or more hydrogen atoms are substituted with fluorine atoms, and examples thereof include a fluoromethyl group, a difluoromethyl group, and trifluoromethyl. Group, fluoroethyl group, difluoroethyl group, trifluoroethyl group, pentafluoroethyl group and the like are included.
- the fluoro sulfonylimide salt which shows high performance as an electrolyte of an electrochemical device can be obtained.
- the reaction vessel and peripheral members are hardly corroded, continuous operation of fluorosulfonylimide salt production is possible, and the content of impurities is reduced. It was possible to provide a modified fluorosulfonylimide salt. Further, since the fluorosulfonylimide salt of the present invention has a reduced impurity content, it is expected that a high-performance electrochemical device can be obtained by using the fluorosulfonylimide salt of the present invention as an electrolyte.
- the content of impurities is reduced to an extremely low level.
- the content of K (potassium) contained as an impurity in the fluorosulfonylimide salt of the present invention is 10000 ppm or less (mass basis).
- K potassium
- the content of K is high, when a fluorosulfonylimide salt is used as an electrolyte provided in an electrochemical device, K is inserted between graphite layers and the electrode is deteriorated, so that the capacity is likely to decrease.
- the K content is 10000 ppm or less, the above-described problem tends to hardly occur.
- the K content is preferably 7000 ppm or less, more preferably 5000 ppm or less, still more preferably 1000 ppm or less, and even more preferably 500 ppm or less.
- the lower limit of the K content is about 0.01 ppm, more preferably 0.1 ppm, and even more preferably 1 ppm.
- the content of Si, B, Fe, Cr, Mo, and Ni contained as impurities in the fluorosulfonylimide salt of the present invention is preferably 1000 ppm or less (mass basis). That is, when all of the above elements are contained, the content of each element of Si, B, Fe, Cr, Mo and Ni contained in the fluorosulfonylimide salt is individually 1000 ppm or less.
- the content of each element of Si, B, Fe, Cr, Mo, and Ni in the fluorosulfonylimide salt is more preferably 800 ppm or less, and even more preferably 500 ppm or less.
- the reaction solution is brought into contact with an aqueous alkali solution, so that the acidic component in the reaction solution is quickly neutralized. Corrosion of the reaction vessel can be prevented. Further, the by-product generated by the fluorination reaction forms a water-soluble complex with the components contained in the alkaline aqueous solution.
- the target fluorosulfonylimide salt is oil-soluble, it is considered that a product with a reduced amount of impurities can be obtained by separating the organic layer by a simple liquid separation operation.
- the Si content is preferably 800 ppm or less in the fluorosulfonylimide and / or fluorosulfonylimide salt, more preferably 500 ppm or less, and even more preferably 100 ppm or less. More preferably, it is 50 ppm or less, and still more preferably 20 ppm or less.
- B, Fe, Cr, Mo and Ni each preferably 800 ppm or less, more preferably 500 ppm or less, still more preferably 100 ppm or less, and even more preferably 50 ppm or less. Yes, and even more preferably 20 ppm or less.
- the content of the impurity is preferably as low as possible, and most preferably the impurity is not contained in the fluorosulfonylimide salt of the present invention (impurity content 0%).
- the lower limit of the content of the impurity The content (total amount) of one or more of Si, B, Fe, Cr, Mo, and Ni may be about 0.1 ppm. The lower limit may be about 0.5 ppm, and the lower limit may be about 1 ppm. If the content of impurities is in the above range, the fluorosulfonylimide salt of the present invention may be used as an ionic conductor provided in various electrochemical devices described later, and the problem may be caused by corrosion of peripheral members or impure ionic components. Is unlikely to occur.
- the fluorosulfonylimide salt of the present invention has a reduced content of by-products containing fluorine atoms generated in the fluorination step, for example, FSO 3 NH 2 (sulfonylamides), FSO 3 H, and the like. Is preferred.
- the content (total amount) of these by-products is preferably 30000 ppm or less (mass basis). More preferably, it is 10,000 ppm or less, More preferably, it is 5000 ppm or less.
- the by-products containing these fluorine atoms are most preferably not contained in the fluorosulfonylimide salt of the present invention.
- the content (lower limit) may be about 0.1 ppm.
- the fluorosulfonylimide salt of the present invention is a fluorine used in a fluorination reaction described later, such as at least one element selected from the group consisting of elements of Groups 11 to 15 and Groups 4 to 6.
- the content of the component derived from the fluoride (fluorinating agent) is also preferably reduced, and specifically, the content (total amount) of the metal derived from the fluorinating agent is preferably 1000 ppm or less.
- the amount of impurities in the product is small, particularly when the fluorosulfonylimide salt of the present invention is used as an ion conductor provided in various electrochemical devices.
- the content of the metal element derived from the fluorinating agent is 500 ppm or less, more preferably 100 ppm or less, still more preferably 50 ppm or less, and even more preferably 10 ppm or less.
- a preferred method for producing the fluorosulfonylimide salt according to the present invention includes a method using a fluorinating agent containing zinc (Zn), copper (Cu), or bismuth (Bi) in the above elements.
- the total content of one or more metal elements selected from the group consisting of Zn, Cu and Bi derived from the fluorinating agent is preferably 1000 ppm or less.
- the content (total amount) of one or more metal elements selected from the group consisting of Zn, Cu, and Bi is 500 ppm or less, more preferably 100 ppm or less, and even more preferably 50 ppm or less. Still more preferably, it is 10 ppm or less.
- the content of zinc (Zn) in the fluorosulfonylimide salt of the present invention is preferably 1000 ppm or less. More preferably, it is 500 ppm or less, More preferably, it is 100 ppm or less, More preferably, it is 50 ppm or less, More preferably, it is 10 ppm or less.
- the lower limit may be about 0.1 ppm. More preferably, it is 1 ppm or more.
- the fluorosulfonylimide salt of the present invention preferably has a halogen content, particularly chlorine (Cl) content of 10,000 ppm or less in addition to zinc.
- chlorine chlorine
- the peripheral members may be corroded when used in various electrochemical devices. More preferably it is 5000 ppm or less, even more preferably 1000 ppm or less, further preferably 500 ppm or less, even more preferably 100 ppm or less, still more preferably 50 ppm or less, and most preferably 20 ppm or less.
- the lower limit may be about 0.1 ppm. More preferably, it is 1 ppm or more.
- the fluorosulfonylimide salt of the present invention with reduced impurity content is considered to exhibit high ionic conductivity from low temperature to high temperature, and also contributes to improvement of device safety at high temperature. It is done.
- the kind and content of the impurities can be analyzed by ICP emission spectroscopic analysis described later or NMR measurement.
- the method for producing the fluorosulfonylimide salt of the present invention is not particularly limited as long as the amount of various impurities is reduced to the above range, but for example, the following production method is preferably employed.
- the method for producing a fluorosulfonylimide salt of the present invention is characterized in that the reaction solution is brought into contact with an alkaline aqueous solution after fluorination reaction of chlorosulfonylimide or a salt thereof.
- hydrogen halides such as hydrogen fluoride derived from raw materials and fluorides (fluorinating agents), halides, etc. can be dissolved as they are or in water.
- substances that show acidity are by-produced.
- the reaction solution after the fluorination reaction is brought into contact with the aqueous alkali solution, it is considered that the acid component in the reaction solution is neutralized and corrosion of the reaction vessel is prevented.
- the components contained in the starting material and fluoride form a complex with the components contained in the alkaline aqueous solution, which is water. Since it is extracted into a layer, it is considered that a fluorosulfonylimide salt with a low impurity content is obtained as a product by separating the organic layer.
- the reaction solution is mixed with an alkaline aqueous solution, and the reaction solution is contacted with the alkaline aqueous solution (alkali contact step).
- alkali contact step is not limited to just after completion of the fluorination reaction, and after the fluorination reaction, after performing a cation exchange reaction of fluorosulfonylimide (or a salt thereof), an alkali contact step is performed. Is also included.
- an aqueous solution of a basic substance may be used.
- Basic substances include ammonia; ethylamine, propylamine, butylamine, pentylamine, hexylamine, heptylamine, octylamine, dimethylamine, diethylamine, dipropylamine, dibutylamine, 2-ethylhexylamine, trimethylamine, triethylamine, tripropyl Carbons such as amine, tributylamine, etc., primary, secondary or tertiary alkylamines having 1-8 carbon atoms, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, etc.
- Aliphatic amines such as alkylenediamines having an alkylene group of 1 to 8 atoms; monoethanolamine, diethanolamine, triethanolamine, monoisopropanol Alkanolamines such as amine, diisopropanolamine and triisopropanolamine; cycloaliphatic amines such as cyclohexylamine and dicyclohexylamine; aromatic amines such as benzylamine and metaxylenediamine; ethylene oxide adducts of these amines; formamidine; Amidine; diazabicycloundecene, diazabicyclononene, piperidine, morpholine, piperazine, pyrimidine, pyrrole, imidazole, imidazoline, triazole, thiazole, pyridine, indole and other heterocyclic amines; alkali metals (lithium, sodium, Potassium) or alkaline earth metal (magnesium, calcium
- an aqueous solution of an amine compound such as ammonia or ethylamine is preferable from the viewpoint of yield.
- an amine compound such as ammonia or ethylamine
- aliphatic amines, alkanolamines, ethylene oxide adducts of these amines, and heterocyclic amines are preferable as basic substances from the viewpoint of affinity with water.
- ammonia water it is recommended to use ammonia water as the alkaline aqueous solution from the viewpoint of being inexpensive and easily available.
- the basic substance used in the alkaline aqueous solution is preferably a substance containing 100 ppm or less of metal components such as Zn, K, Fe, Cr, Ni and Na contained as impurities. More preferably, it is 10 ppm or less.
- the water used for preparing the alkaline aqueous solution preferably has a content of metal components such as Zn, K, Fe, Cr, Ni, Na, etc. of 100 ppm or less. More preferably, it is 10 ppm or less.
- metal components such as Zn, K, Fe, Cr, Ni, Na, etc.
- Such water with a low content of metal components can be prepared by, for example, an ion exchange resin, a distiller, or an ultrapure water device.
- the water used for the preparation of the alkaline aqueous solution may be selected using the electrical conductivity as an index. For example, it is recommended to use water having an electrical resistivity of 0.1 M ⁇ cm or less (25 ° C.).
- the alkaline aqueous solution may contain an organic solvent.
- an organic solvent the thing similar to the reaction solvent mentioned later can be used.
- the amount of the organic solvent in the alkaline aqueous solution is preferably 1 part by mass to 50 parts by mass, more preferably 1 part by mass to 100 parts by mass with respect to 100 parts by mass of water used for preparing the alkaline aqueous solution. 30 parts by mass, and more preferably 1-10 parts by mass.
- the content of metal components such as Zn, K, Fe, Cr, Ni and Na contained in the alkaline aqueous solution prepared using the basic substance and water is preferably 100 ppm or less. More preferably, it is 10 ppm or less.
- the kind and content of the said impurity can be analyzed by the ICP emission spectral analysis method mentioned later.
- the content of the basic substance in the alkaline aqueous solution only needs to include an amount of the basic substance that can form a complex with a specific element contained in the fluoride used in the fluorination reaction described later.
- an amount of the basic substance that can form a complex with a specific element contained in the fluoride used in the fluorination reaction described later For example, it is desirable that 0.3 mol times or more and 30 mol times or less of a basic substance is contained with respect to 1 mol of fluoride. More preferably, it is 0.5 mol times or more, More preferably, it is 1 mol times or more, It is preferable that it is 15 mol times or less, More preferably, it is 10 mol times or less.
- the alkaline aqueous solution is not particularly limited as long as the amount of the basic substance is included in the above range, but when the amount of the alkaline aqueous solution is too large, the amount of waste water increases, Since the target product flows out into the alkaline aqueous solution and the extraction efficiency may decrease, it is not preferable. Therefore, the amount of the alkaline aqueous solution used is preferably 1 to 100 parts by mass with respect to 100 parts by mass of the reaction solution. When the amount of the alkaline aqueous solution used is too small, it may be difficult to sufficiently remove impurities, and a by-product may be precipitated, which is not preferable in the manufacturing process.
- the amount of the alkaline aqueous solution used is more preferably 5 to 50 parts by mass, and still more preferably 10 to 30 parts by mass.
- the reaction solution is brought into contact with an alkaline aqueous solution at a temperature of 5 ° C to 50 ° C. Since heat may be generated when the reaction solution is added to the alkaline aqueous solution, it is preferable to use the alkaline aqueous solution in the above temperature range from the viewpoint of obtaining the product more safely. Further, the reaction solution may be added or contacted with the alkaline aqueous solution while the alkaline aqueous solution is cooled by a water bath or an ice bath.
- the temperature of the aqueous alkali solution is more preferably 10 ° C. to 40 ° C., and further preferably 20 ° C. to 30 ° C. From the viewpoint of more effectively preventing heat generation due to contact between the reaction solution and the aqueous alkali solution, it is preferable to add the reaction solution while stirring the aqueous alkali solution.
- the concentration of fluorosulfonylimide contained in the reaction solution is preferably 1% by mass to 70% by mass. If the concentration is too high, the reaction may become non-uniform. On the other hand, if the concentration is too low, the productivity per batch is low and it is not economical.
- the concentration of fluorosulfonylimide contained in the reaction solution is more preferably 3% by mass to 60% by mass, and further preferably 5% by mass to 50% by mass.
- the alkali contact step may be any one in which the reaction solution and the alkaline aqueous solution are in contact.
- an embodiment in which the reaction solution after the fluorination reaction is added and brought into contact with an aqueous alkali solution; an embodiment in which an aqueous alkali solution is added to the reaction solution after the fluorination reaction and brought into contact; a reaction solution after the fluorination reaction and an aqueous alkali solution Are added to different reaction vessels at the same time to bring them into contact with each other.
- an embodiment in which the reaction solution after the fluorination reaction is added to an alkaline aqueous solution and brought into contact with each other is preferable.
- the mode of adding the reaction solution is not particularly limited, and the mode in which the reaction solution is continuously poured into the alkaline aqueous solution little by little; the mode in which a predetermined amount of the reaction solution is continuously dropped into the alkaline aqueous solution; An embodiment in which the solution is divided into several times and intermittently poured or dropped into an alkaline aqueous solution is mentioned, but the manner in which the reaction solution is added is not limited thereto.
- the contact time between the reaction solution and the aqueous alkali solution is not particularly limited as long as the contact between the reaction solution and the aqueous alkaline solution is sufficient, but for example, about 1 minute (more preferably about 5 minutes) from the end of the addition of the reaction solution.
- the reaction solution and the alkaline aqueous solution are preferably brought into contact with each other while stirring. If the contact time is too short, impurities may remain in the product, and removal of acidic components may be insufficient, resulting in corrosion of the reaction vessel.
- the contact step between the reaction solution and the alkaline aqueous solution may be performed in a conventionally known reaction vessel, and the type thereof is not particularly limited.
- stainless steel such as SUS304, SUS316, SUS329, SUS430, and SUS444; carbon steel; nickel; titanium; chromium; nickel-based alloy containing nickel as a main component and a small amount of molybdenum, chromium, niobium, and iron Manufactured (for example, Hastelloy (registered trademark) (Hastelloy C22, Hastelloy C276, Hastelloy B, etc.), Inconel (registered trademark) (Inconel 600, Inconel 625, Inconel 718, Inconel 750X, etc.); Conventionally known, such as a cobalt-based alloy containing tungsten or the like (for example, Stellite (registered trademark)); a borosilicate glass; a metal reaction vessel whose inner surface is
- the aqueous layer may be removed, and the organic layer may be mixed with the alkaline aqueous solution and washed again (alkali washing).
- alkali washing excessive alkali cleaning leads to an increase in the amount of waste liquid, and the product may flow out to the aqueous layer, so it is recommended that the upper limit of the number of cleanings with an alkaline aqueous solution be about 10 times. . More preferably, it is 5 times or less.
- cleaning by aqueous alkali solution is not specifically limited, Implementing at least once, More preferably, 2 times or more is recommended.
- the organic layer is separated to obtain a product fluorosulfonylimide salt.
- further purification may be performed.
- the fluorosulfonylimide salt according to the present invention can be easily purified by a liquid separation extraction method using water, an organic solvent, and a mixed solvent thereof.
- the organic solvent include ethylene carbonate, propylene carbonate, butylene carbonate, ⁇ -butyrolactone, ⁇ -valerolactone, dimethoxymethane, 1,2-dimethoxyethane, tetrahydrofuran, 2-methyltetrahydrofuran, 1,3-dioxane, 4- Methyl-1,3-dioxolane, methyl formate, methyl acetate, methyl propionate, dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, acetonitrile, sulfolane, 3-methyl sulfolane, dimethyl sulfoxide, N, N-dimethylformamide, N -Aprotic solvents such as methyl oxazolidinone, valeronitrile, benz
- liquid separation extraction method the aspect using water and an organic solvent is preferable. Therefore, it is preferable to use an organic solvent that separates into two layers when mixed with water.
- purification methods other than the liquid separation extraction method, for example, washing with the above solvent, reprecipitation method, liquid separation extraction method, recrystallization method, crystallization method, and purification by chromatography may be employed. Good.
- a solvent used in this invention it is preferable to use a metal component content, such as Zn, K, Fe, Cr, Ni, and Na, of 100 ppm or less. More preferably, it is 10 ppm or less.
- a metal component content such as Zn, K, Fe, Cr, Ni, and Na
- Such an organic solvent can be prepared by, for example, treating with a metal removal filter or a distiller.
- the kind and content of the said impurity can be analyzed by the ICP emission spectral analysis method mentioned later.
- the method for synthesizing fluorosulfonylimide is not particularly limited, and all conventionally known methods can be employed.
- a method of obtaining (fluorosulfonyl) imide by distilling fluorosulfonic acid (HFSO 3 ) in the presence of urea, a fluorosulfonylimide from chlorosulfonylimide using a fluorinating agent.
- Patent Documents 1 and 2 etc. a method of synthesizing fluorosulfonylimide from chlorosulfonylimide using a fluorinating agent is recommended.
- a method for synthesizing fluorosulfonylimide from chlorosulfonylimide will be described.
- a method for synthesizing chlorosulfonylimide as a raw material for fluorosulfonylimide will be described.
- chlorosulfonylimide after reacting cyanic chloride with sulfuric anhydride, reacting the product (chlorosulfonyl isocyanate) with chlorosulfonic acid, reacting amidosulfuric acid with thionyl chloride.
- a method of further reacting with chlorosulfonic acid (a method for synthesizing di (chlorosulfonyl) imide); a method of reacting chlorosulfonyl isocyanate with fluorinated alkylsulfonic acid or fluorosulfonic acid (N- (chlorosulfonyl)- N- (fluoroalkylsulfonyl) imide or N- (chlorosulfonyl) -N- (fluorosulfonyl) imide synthesis method);
- fluorosulfonylimide may be synthesized using commercially available chlorosulfonylimide.
- a fluorination reaction of chlorosulfonylimide is performed.
- the timing of the fluorination reaction is not particularly limited.
- fluorination reaction of chlorosulfonylimide (proton) is performed; after cation exchange reaction of chlorosulfonylimide, fluorination reaction of chlorosulfonylimide salt Any of the embodiments may be possible.
- chlorosulfonylimide proton
- chlorosulfonylimide salt hereinafter referred to as chlorosulfonylimide
- a method of fluorinating di (chlorosulfonyl) imide using an ionic fluoride of a valent cation as a fluorinating agent, or a chlorosulfonylimide is selected from the elements of Groups 11 to 15 and Groups 4 to 6
- a method of reacting with a fluoride containing at least one element selected from the group consisting of CuF 2 , ZnF 2 , SnF 2 , PbF 2 and BiF 3 a method of reacting chlorosulfonylimides with a fluoride containing at least one element selected from the group consisting of elements of Groups 11 to 15 and Groups 4 to 6 is preferable.
- the reaction solvent is not necessarily used when starting materials such as chlorosulfonylimides and the above-mentioned fluorides are in a liquid state and are dissolved in each other, but for example, an aprotic solvent is preferably used.
- an aprotic solvent is preferably used.
- a polar solvent from the viewpoint of smoothly proceeding the fluorination reaction, it is recommended to use a polar solvent, and among the solvents exemplified above, valeronitrile, ethyl acetate, isopropyl acetate and butyl acetate are preferable. From the viewpoint of workability during purification, a solvent having a low boiling point and capable of forming a two-layer state with water is preferable.
- reaction solvent it is preferable to use a solvent having a content of metal components such as Zn, K, Fe, Cr, Ni, Na and the like of 100 ppm or less, like the reaction solvent used for the purification described above. More preferably, it is 10 ppm or less.
- metal components such as Zn, K, Fe, Cr, Ni, Na and the like of 100 ppm or less, like the reaction solvent used for the purification described above. More preferably, it is 10 ppm or less.
- the kind and content of the said impurity can be analyzed by the ICP emission spectral analysis method mentioned later.
- the fluorination reaction can be performed in a conventionally known reaction vessel.
- a conventionally known reaction vessel for example, stainless steel; carbon steel; nickel; titanium; chromium; nickel-base alloy; cobalt-base alloy; borosilicate glass: inner surface treated with glass lining or polytetrafluoroethylene
- Any conventionally known reaction vessel such as a vessel can be used.
- the completion of the fluorination reaction can be confirmed by, for example, 19 F-NMR. That is, a peak appears in a chemical shift corresponding to fluorine as the reaction proceeds, and the relative intensity (integrated value) of the peak increases. Therefore, the completion of the fluorination reaction may be confirmed while tracking the progress of the reaction by 19 F-NMR. If the reaction time is too long, the formation of by-products becomes significant, so fluorination is performed at the time when the relative intensity of the target peak is maximized (for example, about 6 to 12 hours from the start of the reaction). The reaction is preferably terminated.
- Chlorosulfonylimides or fluorosulfonylimide salts can be cation-exchanged by reacting with a salt containing a desired cation (cation exchange reaction step).
- a salt containing a desired cation cation exchange reaction step
- an alkali metal such as Li, Na, K, Rb, or Cs, or an onium cation described later is preferable.
- a fluorosulfonylimide salt containing an alkali metal is useful because it can be used as an ion conductor material for various electrochemical devices by melting at high temperature or dissolving in an appropriate organic solvent.
- Li and Na as a cation is preferable, and the most preferable cation is Li.
- fluorosulfonylimide salt containing onium cation is a room temperature molten salt that keeps the molten state stable at room temperature, as an ion conductor material for electrochemical devices that can withstand long-term use, as a reaction solvent in organic synthesis, etc. This is preferable.
- Examples of the salt containing an alkali metal include hydroxides such as LiOH, NaOH, KOH, RbOH, and CsOH, carbonates such as Na 2 CO 3 , K 2 CO 3 , Rb 2 CO 3 , and Cs 2 CO 3 , LiHCO 3 , NaHCO 3, KHCO 3, RbHCO 3 , CsHCO 3 hydrogen carbonates such as, LiCl, NaCl, KCl, RbCl , chlorides such as CsCl, LiF, NaF, KF, RbF, fluoride such as CsF, CH 3 OLi, Et 2 Alkoxide compounds such as OLi, and alkali metal salts such as alkyllithium compounds such as EtLi, BuLi, and t-BuLi (where Et represents an ethyl group and Bu represents a butyl group).
- hydroxides such as LiOH, NaOH, KOH, RbOH, and CsOH
- carbonates such as Na 2 CO 3
- the present invention does not exclude potassium salts from the above-mentioned salts containing alkali metals, and naturally includes the case where potassium salts are used, but more strictly controls the potassium content in the product. From this viewpoint, it is recommended to use a salt containing no potassium.
- a salt containing no potassium When using an alkali metal salt other than potassium, it is preferable to use an alkali metal salt having a low potassium content.
- the amount of potassium contained in the alkali metal salt other than potassium is preferably 1000 ppm or less, more preferably 100 ppm or less, and further preferably 10 ppm or less.
- the onium cation may be represented by the general formula (I); L + -Rs (wherein L represents C, Si, N, P, S or O. R may be the same or different and represents a hydrogen atom, fluorine In the case of an atom or an organic group and R is an organic group, these may be bonded to each other, s is 2, 3 or 4, and is a value determined by the valence of the element L.
- the bond between LR may be a single bond or a double bond.
- the “organic group” represented by R means a group having at least one carbon atom.
- the “group having at least one carbon atom” only needs to have at least one carbon atom, and may have another atom such as a halogen atom or a hetero atom, a substituent, or the like. Good.
- Specific examples of the substituent include an amino group, an imino group, an amide group, a group having an ether bond, a group having a thioether bond, an ester group, a hydroxyl group, an alkoxy group, a carboxyl group, a carbamoyl group, a cyano group, and a disulfide.
- onium cation represented by the general formula (I) include the following general formula: (Wherein R is the same as in general formula (I)) is preferred. Such onium cations may be used alone or in combination of two or more. Among these, the following onium cations are preferable.
- R 1 to R 12 are the same or different and each represents a hydrogen atom, a fluorine atom, or an organic group. In the case of an organic group, these may be bonded to each other.
- R is hydrogen, a C 1 -C 8 alkyl group, a C 6 -C 12 aryl group, or a C 7 -C 13 aralkyl group.
- L is N in the general formula (I) are preferable.
- preferred chain onium cations are ammonium, trimethylammonium, triethylammonium, tributylammonium, triethylmethylammonium, tetraethylammonium, and diethylmethyl (2-methoxyethyl) ammonium.
- R 1 to R 12 are as defined above
- R 1 to R 12 are a hydrogen atom, a fluorine atom, or an organic group
- examples of the organic group include a linear, branched, or cyclic C 1-18 saturated or unsaturated hydrocarbon group
- fluorine Group is preferred, more preferably a saturated or unsaturated hydrocarbon group having 1 to 8 carbon atoms, or a fluorocarbon group.
- organic groups are hydrogen atom, fluorine atom, nitrogen atom, oxygen atom, sulfur atom, amino group, imino group, amide group, ether group, ester group, hydroxyl group, carboxyl group, carbamoyl group, cyano group, sulfone.
- a functional group such as a group or sulfide group may be contained. More preferably, R 1 to R 12 have one or more of hydrogen atom, fluorine atom, cyano group, sulfone group and the like. When two or more organic groups are bonded, the bond may be formed between the main skeleton of the organic group, or between the main skeleton of the organic group and the functional group described above, or It may be formed between the functional groups.
- Examples of the salt containing the onium cation include halides, hydroxides, carbonates and hydrogencarbonates of the onium cation.
- the concentration of the compound having a sulfonylimide skeleton (eg, fluorosulfonylimide, fluorosulfonylimide salt, etc.) contained in the reaction solution is 1% by mass to 70% by mass. % Is preferred. If the concentration is too high, the reaction may become non-uniform. On the other hand, if the concentration is too low, the productivity per batch is low and it is not economical. More preferably, it is 3% by mass to 60% by mass, and further preferably 5% by mass to 50% by mass.
- a fluorosulfonylimide salt in which the content of various impurities is reduced to an extremely low level can be obtained.
- the di (fluorosulfonyl) imide salt and N- (fluorosulfonyl) -N- (fluoroalkylsulfonyl) imide salt of the present invention in which the content of various impurities is reduced to an extremely low level are lithium secondary batteries, It is useful as an electrolyte or ionic liquid used for capacitors or the like, or as an intermediate of a fluorosulfonyl compound.
- the organic salts of di (fluorosulfonyl) imide and N- (fluorosulfonyl) -N- (fluoroalkylsulfonyl) imide of the present invention are used for charging / discharging primary batteries, lithium (ion) secondary batteries, fuel cells, etc. It is suitably used as a material for an ion conductor constituting an electrochemical device such as a battery having a mechanism, an electrolytic capacitor, an electric double layer capacitor, a solar cell or an electrochromic display element.
- ICP emission spectroscopy A multi-type ICP emission spectrometer (manufactured by Shimadzu Corporation) was prepared by using an aqueous solution having a concentration of 1% obtained by mixing 0.1 g of a fluorosulfonylimide salt obtained in the following experimental example with 9.9 g (18.2 M ⁇ cm) of ultrapure water. "ICPE-9000”) was used to analyze the impurities contained in the product. The lower limit of quantification is 0.1 ppm.
- reaction vessel B made of Pyrex (registered trademark) having a different volume of 100 ml, 5.4 g of 25% by mass of aqueous ammonia (8.48 equivalent, temperature 25 ° C.) was weighed. The reaction solution was slowly added dropwise. After completion of the dropwise addition of the reaction solution, stirring was stopped, the aqueous layer containing by-products such as ZnCl 2 was removed from the reaction solution divided into two layers, and the organic layer containing fluorosulfonylimide was separated.
- Pyrex registered trademark
- Experimental example 2 A fluorosulfonylimide (yield 1.35 g, yield) was obtained in the same manner as in Experimental Example 1 except that a reaction vessel made of Hastelloy (registered trademark) C22 was used instead of the reaction vessels A and B made of Pyrex (registered trademark). 80%) and a lithium salt of fluorosulfonylimide (yield 1.19 g, yield 85%). Tables 1 and 2 show the amounts of impurities contained in the obtained fluorosulfonylimide and its lithium salt.
- Experimental Example 10 A cation exchange reaction was carried out in the same manner as in Experimental Example 1 except that the fluorosulfonylimide obtained in Experimental Example 7 was used as a raw material to produce a lithium salt of fluorosulfonylimide (yield 0.86 g, yield 75%). ).
- Table 2 shows the amount of impurities contained in the obtained lithium salt of fluorosulfonylimide.
- Experimental Example 11 A cation exchange reaction was carried out in the same manner as in Experimental Example 1 except that the fluorosulfonylimide obtained in Experimental Example 8 was used as a raw material to produce a lithium salt of fluorosulfonylimide (yield 0.77 g, yield 73%). ).
- Table 2 shows the amount of impurities contained in the obtained lithium salt of fluorosulfonylimide.
- Lithium bis (fluorosulfonyl) imide (LiFSI) was obtained based on the description in JP-T-2004-522681.
- the reaction solution was not contacted with the alkaline aqueous solution.
- Table 2 shows the amount of impurities contained in the obtained lithium salt of fluorosulfonylimide.
- the inner surface of the reaction vessel (made by Pyrex (registered trademark)) used in Experimental Examples 7 and 9 was white and cloudy, and the gloss seen before use was lost.
- the reaction vessel (made of Hastelloy (registered trademark) C22) used in Experimental Example 8 has an inner surface with a loss of luster and a cloudy appearance. When observed with a USB-connected digital microscope “YDU-2” (magnification: 200 times), it was confirmed that there were many holes on the surface, and that the part turned black and corrosion occurred. It was. It should be noted that such a change was not confirmed in the reaction vessels used in Experimental Examples 1 to 6, and the inner surface of the reaction vessel had the same gloss as before the start of the reaction even after the completion of the reaction.
- Experimental Examples 13 and 14 Charge / Discharge Test Using LiFSI obtained in Experimental Example 1 (potassium content less than 1 ppm, Experimental Example 13) and LiFSI obtained in Experimental Example 12 (potassium content 5489 ppm, Experimental Example 14) as electrolytes CR2032-type coin cells were manufactured and a charge / discharge test was conducted.
- the electrolyte was prepared by dissolving LiFSI in a solvent in which ethylene carbonate (EC) and ethyl methyl carbonate (EMC) were mixed at a volume ratio of 1: 1 so that the concentration would be 1M.
- EC ethylene carbonate
- EMC ethyl methyl carbonate
- LBG grade EC and EMC manufactured by Kishida Chemical Co., Ltd. were used as the solvent.
- the coin cell uses artificial graphite (“MAGD”, manufactured by Hitachi Chemical Co., Ltd.) for the positive electrode and lithium foil (thickness: 0.5 mm, manufactured by Honjo Metal Co., Ltd.) for the negative electrode.
- Selgard (registered trademark) 2400 ", single-layer polypropylene separator, manufactured by Celgard Co., Ltd.) and a glass filter (" GA-100 ", manufactured by Advantech Co., Ltd.) are placed opposite to each other. 1/1) Prepared by filling with solution.
- the produced coin cell was stabilized at 30 ° C. for 6 hours, and the discharge capacity up to 40 cycles was measured with a charge / discharge test apparatus (BS2501, manufactured by Keiki Center Co., Ltd.).
- a charge / discharge pause time of 15 minutes was provided at each charge / discharge, the charge / discharge rate was 0.1 C, and the charge / discharge range was 0.02-3V.
- the results are shown in FIG.
- the reaction vessel and the like are hardly corroded, so that the continuous operation of the production of the fluorosulfonylimide salt is possible, which is extremely significant industrially.
- the di (fluorosulfonyl) imide salt of the present invention N- (fluorosulfonyl) -N- (fluoroalkylsulfonyl), obtained by the production method of the present invention and having a content of various impurities reduced to an extremely low level.
- the imide salt is useful as an electrolyte, an ionic liquid, an intermediate of a sulfonylimide salt, or the like used for a lithium secondary battery or a capacitor.
- the fluorosulfonylimide salt of the present invention as an electrolyte, a high-performance electrochemical device is expected.
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Abstract
Description
また、本発明のフルオロスルホニルイミド塩は、不純物であるFSO3NH2および/またはFSO3Hの含有量が30000ppm以下であるのが好ましい。さらに、本発明のフルオロスルホニルイミド塩は、Si、B、Fe、Cr、Mo、Niの含有量が、それぞれ1000ppm以下であるのが好ましい。また、本発明のフルオロスルホニルイミド塩としては、Zn、Cu、Biよりなる群から選ばれる1種以上の金属元素の含有量の合計が1000ppm以下であるのが好ましい。さらに、Zn(亜鉛)の含有量は500ppm以下であるのが好ましい。加えて、本発明のフルオロスルホニルイミド塩は、Cl(塩素)の含有量が10000ppm以下であるのが好ましい。
本発明によれば、反応副生成物として酸が生じる場合であっても、反応容器や周辺部材が腐食され難く、フルオロスルホニルイミド塩製造の連続操業が可能となり、また、不純物の含有量が低減されたフルオロスルホニルイミド塩を提供することができた。また、本発明のフルオロスルホニルイミド塩は、不純物含有量が低減されているため、本発明のフルオロスルホニルイミド塩を電解質として用いることで、高性能な電気化学デバイスとなることが期待される。
例えば、テトラメチルアンモニウム、テトラエチルアンモニウム、テトラプロピルアンモニウム、テトラブチルアンモニウム、テトラヘプチルアンモニウム、テトラヘキシルアンモニウム、テトラオクチルアンモニウム、トリエチルメチルアンモニウム、メトキシエチルジエチルメチルアンモニウム、トリメチルフェニルアンモニウム、ベンジルトリメチルアンモニウム、ベンジルトリブチルアンモニウム、ベンジルトリエチルアンモニウム、ジメチルジステアリルアンモニウム、ジアリルジメチルアンモニウム、2-メトキシエトキシメチルトリメチルアンモニウム、テトラキス(ペンタフルオロエチル)アンモニウム等の第4級アンモニウム類、トリメチルアンモニウム、トリエチルアンモニウム、トリブチルアンモニウム、ジエチルメチルアンモニウム、ジメチルエチルアンモニウム、ジブチルメチルアンモニウム等の第3級アンモニウム類、ジメチルアンモニウム、ジエチルアンモニウム、ジブチルアンモニウム等の第2級アンモニウム類、メチルアンモニウム、エチルアンモニウム、ブチルアンモニウム、ヘキシルアンモニウム、オクチルアンモニウム等の第1級アンモニウム類、N-メトキシトリメチルアンモニウム、N-エトキシトリメチルアンモニウム、N-プロポキシトリメチルアンモニウム及びNH4等のアンモニウム化合物等が挙げられる。これら例示の鎖状オニウムカチオンの中でも、アンモニウム、トリメチルアンモニウム、トリエチルアンモニウム、トリブチルアンモニウム、トリエチルメチルアンモニウム、テトラエチルアンモニウムおよびジエチルメチル(2-メトキシエチル)アンモニウムが好ましい鎖状オニウムカチオンとして挙げられる。
下記実験例で得られたフルオロスルホニルイミド塩0.1gを超純水9.9g(18.2MΩcm)と混合した濃度1%の水溶液を測定試料とし、マルチタイプICP発光分光分析装置(島津製作所製「ICPE-9000」)を使用して、生成物中に含まれる不純物の分析を行った。なお、定量下限は0.1ppmである。
1H-NMR、19F-NMRの測定は、Varian社製の「Unity Plus-400」を使用して行った(内部標準物質:トリフルオロメチルベンゼン、積算回数:16回)。
(フッ素化反応)
窒素雰囲気下、容量100mlのパイレックス(登録商標)製反応容器Aに酢酸ブチル18gを量り取り、ここに2.00g(9.34mmol)のジ(クロロスルホニル)イミドをゆっくりと滴下して加えた。次いで、ここに、1.01g(9.81mmol、1.05当量)のZnF2粉末を投入し、完全に溶解するまで室温(25℃)で6時間攪拌した。
19F-NMR(CD3CN):δ56.0
次いで、得られた有機層に含まれるフルオロスルホニルイミドに対して2当量のLiOH飽和水溶液(約3g)を加えて攪拌した。その後、反応溶液から水層を除去し、得られた有機層から酢酸ブチルを留去し、乾固させることで、白色固体のフルオロスルホニルイミドのリチウム塩を得た(収量:1.27g、収率90%)。得られたフルオロスルホニルイミドのリチウム塩中に含まれる不純物量を表2に示す。
19F-NMR(CD3CN):δ56.0
パイレックス(登録商標)製の反応容器A、Bの代わりにハステロイ(登録商標)C22製の反応容器を使用したこと以外は、実験例1と同様にして、フルオロスルホニルイミド(収量1.35g、収率80%)およびフルオロスルホニルイミドのリチウム塩(収量1.19g、収率85%)を製造した。得られたフルオロスルホニルイミドおよびそのリチウム塩中に含まれる不純物量を、表1、表2に示す。
実験例1と同様にして、酢酸ブチルとジ(クロロスルホニル)イミドの混合溶液に、フッ化亜鉛粉末を添加した。フッ化亜鉛の溶解後、反応容器Aに1.35g(9.81mmol、1.05当量)のトリエチルアミン塩酸塩を加え、10分間攪拌した。1H-NMRより、フルオロスルホニルイミドのトリエチルアミン塩が生成していることを確認した(収量1.32g、収率78%)。得られたフルオロスルホニルイミドに含まれる各種不純物量を測定した。結果を表1に示す。
1H-NMR(CD3CN):δ3.1(6H)、1.2(9H)
19F-NMR(CD3CN):δ56.0
19F-NMR(CD3CN):δ56.0
ジ(クロロスルホニルイミド)のフッ素化反応後、パイレックス(登録商標)製反応容器A中の反応溶液に、5.4gの25質量%アンモニア水(8.48当量、温度25℃)をゆっくりと添加したこと以外は、実験例1と同様にして、フルオロスルホニルイミド塩(収量1.32g、収率78%)、フルオロスルホニルイミドのリチウム塩を製造した(収量1.13g、収率83%)。得られたフルオロスルホニルイミドおよびそのリチウム塩中に含まれる不純物量を、表1、表2に示す。
ジ(クロロスルホニルイミド)のフッ素化反応後、ハステロイ(登録商標)C22製の反応容器中の反応溶液に、5.4gの25質量%アンモニア水(8.48当量、温度25℃)をゆっくりと添加したこと以外は、実験例2と同様にして、フルオロスルホニルイミド(収量1.20g、収率71%)およびフルオロスルホニルイミドのリチウム塩を製造した(収量1.06g、収率85%)。得られたフルオロスルホニルイミドおよびそのリチウム塩中に含まれる不純物量を、表1、表2に示す。
窒素雰囲気下、容量3lのパイレックス(登録商標)製反応容器Aに酢酸ブチル1.8kgを量り取り、ここに200g(934mmol)のジ(クロロスルホニル)イミドをゆっくりと滴下して加えた。次いで、ここに、101g(981mmol、1.05当量)のZnF2粉末を投入し、完全に溶解するまで室温(25℃)で6時間攪拌した。
19F-NMR(CD3CN):δ56.0
19F-NMR(CD3CN):δ56.0
アンモニア水に代えて、超純水5.4g(温度25℃、18.2MΩcm(全てのイオン成分量<1ppm))を使用したこと以外は実験例1と同様にして、フルオロスルホニルイミドを製造した(収量1.10g、収率66%)。得られたフルオロスルホニルイミドに含まれる各種不純物量を測定した。結果を表1に示す。
アンモニア水に代えて、超純水5.4gを使用したこと以外は実験例2と同様にして、フルオロスルホニルイミドを製造した(収量1.01g、収率60%)。得られたフルオロスルホニルイミドに含まれる各種不純物量を測定した。結果を表1に示す。
フルオロスルホニルイミドと超純水とを接触させた後、さらに2回、5.4gの超純水と接触させたこと以外は実験例7と同様にして、フルオロスルホニルイミド(収量0.48g、収率29%)を製造した。得られたフルオロスルホニルイミドに含まれる各種不純物量を測定した。結果を表1に示す。
実験例7で得られたフルオロスルホニルイミドを原料としたこと以外は実験例1と同様にしてカチオン交換反応を行って、フルオロスルホニルイミドのリチウム塩を製造した(収量0.86g、収率75%)。得られたフルオロスルホニルイミドのリチウム塩中に含まれる不純物量を表2に示す。
実験例8で得られたフルオロスルホニルイミドを原料としたこと以外は実験例1と同様にしてカチオン交換反応を行って、フルオロスルホニルイミドのリチウム塩を製造した(収量0.77g、収率73%)。得られたフルオロスルホニルイミドのリチウム塩中に含まれる不純物量を表2に示す。
特表2004-522681号公報の記載に基づき、リチウムビス(フルオロスルホニル)イミド(LiFSI)を得た。なお、実験例12では、反応溶液とアルカリ水溶液との接触は行わなかった。得られたフルオロスルホニルイミドのリチウム塩中に含まれる不純物量を表2に示す。
実験例1で得られたLiFSI(カリウム含有量1ppm未満、実験例13)、実験例12で得られたLiFSI(カリウム含有量5489ppm、実験例14)を電解質として用いてCR2032型のコインセルを作製し、充放電試験を行った。電解液は、いずれの場合も、エチレンカーボネート(EC)とエチルメチルカーボネート(EMC)とを1:1の体積比で混合した溶媒に、濃度が1MとなるようにLiFSIを溶解させて調製した。なお、溶媒としては、キシダ化学株式会社製のLBGグレードのEC、EMCを使用した。
Claims (13)
- Kの含有量が、10000ppm以下であることを特徴とするフルオロスルホニルイミド塩。
- さらに、不純物であるFSO3NH2および/またはFSO3Hの含有量が30000ppm以下である請求項1に記載のフルオロスルホニルイミド塩。
- Si、B、Fe、Cr、Mo、Niの含有量が、それぞれ1000ppm以下である請求項1または2に記載のフルオロスルホニルイミド塩。
- Zn、Cu、Biよりなる群から選ばれる1種以上の金属元素の含有量の合計が1000ppm以下である請求項1~3のいずれかに記載のフルオロスルホニルイミド塩。
- Znの含有量が500ppm以下である請求項1~4のいずれかに記載のフルオロスルホニルイミド塩。
- Clの含有量が10000ppm以下である請求項1~5のいずれかに記載のフルオロスルホニルイミド塩。
- 上記フルオロスルホニルイミド塩が、ジ(フルオロスルホニル)イミド塩である請求項1~6のいずれかに記載のフルオロスルホニルイミド塩。
- 上記フルオロスルホニルイミド塩が、リチウムジ(フルオロスルホニル)イミドである請求項1~7のいずれかに記載のフルオロスルホニルイミド塩。
- 高純度フルオロスルホニルイミド塩の製造方法であって、
クロロスルホニルイミドまたはその塩のフッ素化反応後に、不純物除去のため、反応溶液をアルカリ水溶液と接触させることを特徴とするフルオロスルホニルイミド塩の製造方法。 - 上記接触を、反応溶液をアルカリ水溶液中に添加することにより行う請求項9に記載のフルオロスルホニルイミド塩の製造方法。
- 温度5℃~50℃のアルカリ水溶液と前記反応溶液とを接触させる請求項9又は10に記載のフルオロスルホニルイミド塩の製造方法。
- 前記反応溶液100質量部に対してアルカリ水溶液を1質量部~100質量部用いる請求項9~11のいずれかに記載のフルオロスルホニルイミド塩の製造方法。
- 前記アルカリ水溶液がアンモニア水である請求項9~12のいずれかに記載のフルオロスルホニルイミド塩の製造方法。
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Also Published As
Publication number | Publication date |
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JP2012136429A (ja) | 2012-07-19 |
EP2505551A4 (en) | 2013-11-20 |
CN102405189B (zh) | 2014-07-09 |
EP2505551A1 (en) | 2012-10-03 |
JP5744779B2 (ja) | 2015-07-08 |
PL2505551T3 (pl) | 2018-12-31 |
HUE039514T2 (hu) | 2019-01-28 |
EP2505551B1 (en) | 2018-07-25 |
JPWO2011065502A1 (ja) | 2013-04-18 |
KR101345271B1 (ko) | 2013-12-27 |
PL2505551T5 (pl) | 2022-05-23 |
CN102405189A (zh) | 2012-04-04 |
US20120041233A1 (en) | 2012-02-16 |
KR20120022833A (ko) | 2012-03-12 |
EP2505551B2 (en) | 2022-03-09 |
US9947967B2 (en) | 2018-04-17 |
JP4959859B2 (ja) | 2012-06-27 |
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