CN107188138B - A kind of preparation method of double fluorine sulfimide lithiums - Google Patents

A kind of preparation method of double fluorine sulfimide lithiums Download PDF

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CN107188138B
CN107188138B CN201710299616.7A CN201710299616A CN107188138B CN 107188138 B CN107188138 B CN 107188138B CN 201710299616 A CN201710299616 A CN 201710299616A CN 107188138 B CN107188138 B CN 107188138B
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double fluorine
fluorine sulfimide
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lithium
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CN107188138A (en
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罗乾
巩梦洁
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Changde Dadu New Material Co ltd
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Huizhou Avenue New Mstar Technology Ltd
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    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B21/00Nitrogen; Compounds thereof
    • C01B21/082Compounds containing nitrogen and non-metals and optionally metals
    • C01B21/086Compounds containing nitrogen and non-metals and optionally metals containing one or more sulfur atoms

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Abstract

The invention discloses a kind of preparation methods of double fluorine sulfimide lithiums, comprising the following steps: 1) prepares fluorine sulfonamide lithium;2) vikane is prepared, vikane is passed through in fluorine sulfonamide lithium solution, acid binding agent is added, double fluorine sulfimide ammonium salts are prepared;3) double fluorine sulfimide ammonium salts are dissolved into aqueous solution, exchange to obtain double fluorine sulfimide aqueous solutions by acidic resins;4) lithium carbonate is added, adjusts pH value and is in neutrality, be filtered to remove insoluble matter, most of water is removed under reduced pressure, weakly polar organic solvent is added, double fluorine sulfimide lithium crude products is precipitated, be further dried under reduced pressure;5) into double fluorine sulfimide lithium crude products, polar solvent is added, stirring and dissolving is filtered to remove insoluble matter, and intensive polar solvent is removed under reduced pressure, and weak polar solvent is added and is recrystallized, is dried under reduced pressure to obtain product after filtering.Preparation method of the invention is simple, and the reaction time is short, high income, and can be effectively controlled metal ion and anionic impurity, obtains the product of high-purity.

Description

A kind of preparation method of double fluorine sulfimide lithiums
Technical field
The present invention relates to technical field of compound preparation more particularly to a kind of preparation methods of double fluorine sulfimide lithiums.
Background technique
Fluoro sulfimide and related compound play the role of in materials chemistry and electrochemical energy storage field it is extremely important, Especially lithium trifluoromethanesulp,onylimide and double fluorine sulfimide lithiums has important industrial application valence in lithium ion battery Value.Double fluorine sulfimides are the important raw materials for preparing lithium salts and other alkali metal salts and derivative, double fluorine sulfimides one As by double chlorine sulfimides be fluorinated prepare, the preparation process of double chlorine sulfimides specifically include that 1) phosphorus pentachloride, sulfamic acid and Chlorosulfonic acid reaction prepares (K.Ruff et al, Inorg.Synth.1968,11,138);2) sulfamic acid, thionyl chloride and chlorine Sulfonic acid reaction prepares (M.Beran, Z.Anorg Allg Chem., 2005,631,55).Fluorination reagent mainly have arsenic trifluoride, Antimony trifluoride, zinc fluoride, anhydrous hydrogen fluoride, bismuth fluoride etc..Double fluorine sulfimide lithium preparation methods have: 1) double fluorine sulfimides Potassium and other lithium salts exchange systems standby (such as lithium perchlorate and LiBF4) (M.Beran, Polyhedron, 2006,25, 1292);2) double fluorine sulfimides or ammonium salt and lithium carbonate (or lithium hydroxide) neutralization prepare (CN101980955A, CN102405189A, CN102917979A, CN104925765A).But there are low yield, ionic impurities to contain for existing method Measure the defects of high.
Summary of the invention
The purpose of the present invention is to provide a kind of preparation sides of the double fluorine sulfimide lithiums of high-purity needed for lithium ion battery Method.
In order to solve the above technical problems, the present invention adopts the following technical scheme: a kind of preparation side of double fluorine sulfimide lithiums Method, specifically includes the following steps:
1) fluorine sulfonamide prepares fluorine sulfonamide lithium in aqueous solution or organic solvent with lithium carbonate effect;
2) chlorosulfuric acid and fluorination reagent reaction prepare vikane, and prepared vikane is passed directly into fluorine sulfonamide lithium solution In, tertiary amine is added as acid binding agent, double fluorine sulfimide ammonium salts are prepared;
3) double fluorine sulfimide ammonium salt described in step 2) is dissolved into aqueous solution, exchanges to obtain by acidic resins double Fluorine sulfimide aqueous solution;
4) lithium carbonate is added into double fluorine sulfimide aqueous solutions, adjusts aqueous ph value and is in neutrality, be filtered to remove insoluble Most of water is removed under reduced pressure in object, weakly polar organic solvent is added, double fluorine sulfimide lithium crude products are precipitated, further decompression is dry It is dry;
5) in the double fluorine sulfimide lithium crude products of the drying that step 4) is prepared, dry polar solvent is added, stirs Dissolution, is filtered to remove insoluble matter, and most of intensive polar solvent is removed under reduced pressure, and weak polar solvent is added and carries out recrystallization operation, mistake It is dried under reduced pressure to obtain product after filter.
Preferably, organic solvent described in step 1) includes acetonitrile, acetone, dimethyl carbonate, diethyl carbonate, carbonic acid first At least one of ethyl ester, ethyl acetate, propyl acetate, butyl acetate, ether and methyl tertiary butyl ether(MTBE).
Preferably, fluorination reagent described in step 2) include sodium fluoride, potassium fluoride, zinc fluoride, in antimony trifluoride at least The nonstoichiometric molar ratio of one kind, chlorosulfuric acid and fluorination reagent is 1:2~1:5.
Preferably, the nonstoichiometric molar ratio of the chlorosulfuric acid and fluorination reagent is 1:2.2~1:4, reaction temperature 25 ~80 DEG C.
Preferably, tertiary amine described in step 2) include triethylamine, tripropyl amine (TPA), tri-n-butylamine, diisopropyl ethyl amine, pyridine, At least one of picoline, imidazoles.
Preferably, acidic resins described in step 3) are the highly acidic resin of sulfonic acid type or the weakly acidic resin of carboxylic acid type.
Preferably, weakly polar organic solvent described in step 4) be methylene chloride, chloroform, n-hexane, hexamethylene, Toluene, dimethylbenzene, chlorobenzene, fluorobenzene.
Preferably, the temperature being dried under reduced pressure described in step 4) is 60~120 DEG C.
Preferably, polar solvent described in step 5) is dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, acetic acid Ethyl ester, propyl acetate, butyl acetate, propyl propionate, acetonitrile, propionitrile, acetone, tetrahydrofuran, ether, methyl tertiary butyl ether(MTBE), third Ether, butyl ether, glycol dimethyl ether.
Preferably, weak polar solvent described in step 5) is methylene chloride, chloroform, n-hexane, hexamethylene, first Benzene, dimethylbenzene, chlorobenzene, fluorobenzene.
Preparation process provided by the invention is simple, and the reaction time is short, high income, and can be effectively controlled metal ion and yin from Double fluorine sulfimide lithium target products of high-purity can be prepared in sub- impurity.
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification Other advantages and efficacy of the present invention can be easily understood for disclosed content.One or more method and step mentioned in the present invention Do not repel and is gone back before and after the combination step there may also be other methods step or between these explicitly mentioned steps Other methods step can be inserted, unless otherwise indicated.
Embodiment 1:
FSO2NH2+Li2CO3→FSO2NHLi
SO2Cl2+KF→SO2F2
FSO2NHLi+SO2F2+Py→FSO2NHSO2F·Py
FSO2NHSO2F+Li2CO3→FSO2NLiSO2F
49.5g (0.5mol) fluorine sulfonamide is added in the reaction flask of 500mL, acetonitrile is added under ice-water bath as solvent, adds Enter 20.4g (0.275mol) Carbon Dioxide lithium, stirs to neutrality, be filtered under diminished pressure, be dried under reduced pressure after obtaining clear filtrate, obtain fluorine Sulfonamide lithium crude product.
The reaction flask of 500mL walks prepared fluorine sulfonamide lithium in addition, and the dry acetonitrile of 200mL and 39.5g is added (0.5mol) pyridine, ice-water bath separately take the reaction flask of a 500mL that 135g (1mol) chlorosulfuric acid, 200mL carbonic acid diethyl is added Ester, 69.6g (1.2mol) anhydrous potassium fluoride, magnetic agitation, 80 degree of temperature control, reaction flask connects the reflux condensing tube of -20 degree, condensation The pipe other end is passed through in fluorine sulfonamide lithium/acetonitrile solution, is stopped after reacting 8 hours.It is filtered under diminished pressure to obtain clear filtrate, depressurize Acetonitrile is removed, double fluorine sulfimide pyridiniujms are obtained.
Double fluorine sulfimide pyridiniujms are dissolved into water, are exchanged by sulfonic acid type acid resin, double fluorine sulfimides are obtained Lithium carbonate is added in aqueous solution, adjusts pH value as neutrality, is filtered to remove solid, aqueous solution is concentrated under reduced pressure, toluene is added, crystalline substance is precipitated Body is dried under reduced pressure after filtering.Dry dimethyl carbonate solvent is added, is filtered to remove insoluble matter after dissolution, is removed under reduced pressure big Dimethyl carbonate is measured, toluene is added and carries out recrystallization operation, obtained solid obtains 65 grams of products after being dried under reduced pressure.(19F-NMR, 51.4;Cl-ND;SO4 2-ND;K<1ppm;Na<5ppm;Mg<1ppm;Ca<1ppm;Fe ND;Hg ND;Cr ND).
Embodiment 2:
FSO2NH2+LiOH→FSO2NHLi
SO2Cl2+NaF→SO2F2
FSO2NHLi+SO2F2+(C2H5)3N→FSO2NHSO2F·Py
FSO2NHSO2F+LiOH→FSO2NLiSO2F
49.5g (0.5mol) fluorine sulfonamide is added in the reaction flask of 500mL, acetonitrile is added under ice-water bath as solvent, adds Enter 6.6g (0.275mol) lithium hydroxide, stirs to neutrality, be filtered under diminished pressure, be dried under reduced pressure after obtaining clear filtrate, obtain fluorine sulphur Amide lithium crude product.
The reaction flask of 500mL walks prepared fluorine sulfonamide lithium in addition, and the dry acetonitrile of 200mL and 50.5g is added (0.5mol) triethylamine, ice-water bath separately take the reaction flask of a 500mL that 135g (1mol) chlorosulfuric acid, 200mL carbonic acid diethyl is added Ester, 50.4g (1.2mol) anhydrous sodium fluoride, magnetic agitation, 80 degree of temperature control, reaction flask connects the reflux condensing tube of -20 degree, condensation The pipe other end is passed through in fluorine sulfonamide lithium/acetonitrile solution, is stopped after reacting 8 hours.It is filtered under diminished pressure to obtain clear filtrate, depressurize Acetonitrile is removed, difluoro sulfimide triethylamine salt is obtained.
Difluoro sulfimide triethylamine salt is dissolved into water, is exchanged by sulfonic acid type acid resin, it is sub- to obtain difluoro sulphonyl Lithium hydroxide is added in amine aqueous solution, and adjusting pH value is neutrality, is filtered to remove solid, and aqueous solution is concentrated under reduced pressure, and toluene is added and is precipitated Crystal is dried under reduced pressure after filtering.Dry dimethyl carbonate solvent is added, insoluble matter is filtered to remove after dissolution, is removed under reduced pressure A large amount of dimethyl carbonates are added toluene and carry out recrystallization operation, and obtained solid obtains 63 grams of products after being dried under reduced pressure.(19F-NMR, 51.6;Cl-ND;SO4 2-ND;K<1ppm;Na<5ppm;Mg<1ppm;Ca<1ppm;Fe ND;Hg ND;Cr ND).
Comparative example 1:
21.9g (0.1mol) double fluorine sulfimide potassium are added in the reaction flask of 500mL, 100mL carbonic acid two is added at room temperature Methyl esters is added 9.4g (0.1mol) LiBF4, stirs 3 hours, be filtered under diminished pressure, subtract after obtaining clear filtrate as solvent It press dry dry, obtains the bis- fluorine sulfimide lithium products of 18.2g.(19F-NMR,51.4;Cl-10ppm;SO4 2-20ppm;K 1800ppm; Na 5ppm;Mg<1ppm;Ca<1ppm;Fe ND;Hg ND;Cr ND).
Comparative example 2:
42.8g (0.2mol) double chlorine sulfimides are added in the reaction flask of 500mL, 24.7g (0.24mol) is added at room temperature Anhydrous zinc fluoride, after stirring 5 hours, water pump is evaporated under reduced pressure to obtain double fluorine sulfimide crude products, distills and obtains three times repeatedly The bis- fluorine sulfimides of 27.2g.
The bis- fluorine sulfimides of 27.2g are dissolved into 100mL DMC, be added 15.2g (0.15mol) triethylamine, then plus Enter 50mL water and 12.6g lithium hydroxide, separate organic phase after stirring 2 hours, double fluorine sulfimide lithiums are obtained after being dried under reduced pressure Crude product, dimethyl carbonate/toluene Mixed Solvent recrystallization, filtering are dried under reduced pressure to obtain 16.8 grams of double fluorine sulfimide lithiums.19F-NMR,51.5;Cl-12ppm;SO4 2-15ppm;K<2ppm;Na<5ppm;Mg<1ppm;Ca<1ppm;Fe ND;Hg ND;Cr ND)。
Due to dichloro sulfimide and difluoro sulfimide boiling point it can be seen from embodiment 1,2 and comparative example 1,2 results Difference is not too greatly, to cause difluoro sulfimide inevitably to mix the chloride ion of more amount, therefore product chlorinity is higher.Comparative example 1 prepares difluoro sulfimide lithium using ion-exchange, since by-product sylvite is difficult sufficiently to go by the method for precipitation/filtration It removes, causes product potassium content very high, far beyond the specification of lithium-ion battery electrolytes.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as Protection scope of the present invention.

Claims (10)

1. a kind of preparation method of double fluorine sulfimide lithiums, which comprises the following steps:
1) fluorine sulfonamide prepares fluorine sulfonamide lithium in aqueous solution or organic solvent with lithium carbonate effect;
2) chlorosulfuric acid and fluorination reagent reaction prepare vikane, and prepared vikane is passed directly into fluorine sulfonamide lithium solution, Tertiary amine is added as acid binding agent, double fluorine sulfimide ammonium salts are prepared;
3) double fluorine sulfimide ammonium salt described in step 2) is dissolved into aqueous solution, exchanges to obtain double fluorine sulphurs by acidic resins Acid imide aqueous solution;
4) lithium carbonate is added into double fluorine sulfimide aqueous solutions, adjusts aqueous ph value and is in neutrality, be filtered to remove insoluble matter, subtract Pressure removes most of water, weakly polar organic solvent is added, double fluorine sulfimide lithium crude products are precipitated, be further dried under reduced pressure;
5) in the double fluorine sulfimide lithium crude products of the drying that step 4) is prepared, it is added dry polar solvent, stirring and dissolving, It is filtered to remove insoluble matter, most of intensive polar solvent is removed under reduced pressure, weak polar solvent is added and carries out recrystallization operation, subtracts after filtering Pressure is dried to obtain product.
2. the preparation method of double fluorine sulfimide lithiums according to claim 1, it is characterised in that: organic described in step 1) Solvent includes acetonitrile, acetone, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, ethyl acetate, propyl acetate, acetic acid fourth At least one of ester, ether and methyl tertiary butyl ether(MTBE).
3. the preparation method of double fluorine sulfimide lithiums according to claim 1, it is characterised in that: fluorination described in step 2) Reagent includes at least one of sodium fluoride, potassium fluoride, zinc fluoride, antimony trifluoride, the stoichiometry of chlorosulfuric acid and fluorination reagent Molar ratio is 1:2~1:5.
4. the preparation method of double fluorine sulfimide lithiums according to claim 3, it is characterised in that: the chlorosulfuric acid and fluorination The nonstoichiometric molar ratio of reagent is 1:2.2~1:4, and reaction temperature is 25~80 DEG C.
5. the preparation method of double fluorine sulfimide lithiums according to claim 4, it is characterised in that: tertiary amine described in step 2) Including at least one of triethylamine, tripropyl amine (TPA), tri-n-butylamine, diisopropyl ethyl amine, pyridine, picoline, imidazoles.
6. the preparation method of double fluorine sulfimide lithiums according to claim 1, it is characterised in that: acidity described in step 3) Resin is the highly acidic resin of sulfonic acid type or the weakly acidic resin of carboxylic acid type.
7. the preparation method of double fluorine sulfimide lithiums according to claim 1, it is characterised in that: weak described in step 4) Polar organic solvent is methylene chloride, chloroform, n-hexane, hexamethylene, toluene, dimethylbenzene, chlorobenzene, fluorobenzene.
8. the preparation method of double fluorine sulfimide lithiums according to claim 7, it is characterised in that: depressurized described in step 4) Dry temperature is 60~120 DEG C.
9. the preparation method of double fluorine sulfimide lithiums according to claim 1, it is characterised in that: pole described in step 5) Property solvent be dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, ethyl acetate, propyl acetate, butyl acetate, propyl propionate, Acetonitrile, propionitrile, acetone, tetrahydrofuran, ether, methyl tertiary butyl ether(MTBE), propyl ether, butyl ether, glycol dimethyl ether.
10. the preparation method of double fluorine sulfimide lithiums according to claim 8, it is characterised in that: described in step 5) Weak polar solvent is methylene chloride, chloroform, n-hexane, hexamethylene, toluene, dimethylbenzene, chlorobenzene, fluorobenzene.
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