CA2776178A1 - Ionic compounds - Google Patents

Ionic compounds Download PDF

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CA2776178A1
CA2776178A1 CA2776178A CA2776178A CA2776178A1 CA 2776178 A1 CA2776178 A1 CA 2776178A1 CA 2776178 A CA2776178 A CA 2776178A CA 2776178 A CA2776178 A CA 2776178A CA 2776178 A1 CA2776178 A1 CA 2776178A1
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Prior art keywords
ionic
amide
ionic liquid
bis
ionic compound
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French (fr)
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Matjaz Kozelj
Abdelbast Guerfi
Julie Trottier
Karim Zaghib
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Hydro Quebec
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Hydro Quebec
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Priority to CA2776178A priority Critical patent/CA2776178A1/en
Priority to CA2867628A priority patent/CA2867628C/en
Priority to JP2015503720A priority patent/JP6430365B2/en
Priority to CN201380018807.1A priority patent/CN104321328B/en
Priority to US14/390,638 priority patent/US9969757B2/en
Priority to PCT/CA2013/050277 priority patent/WO2013149349A1/en
Priority to EP13772854.9A priority patent/EP2834251B1/en
Priority to IN8249DEN2014 priority patent/IN2014DN08249A/en
Priority to KR1020147029363A priority patent/KR102084095B1/en
Priority to ES13772854T priority patent/ES2772452T3/en
Publication of CA2776178A1 publication Critical patent/CA2776178A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
    • C07F7/02—Silicon compounds
    • C07F7/08—Compounds having one or more C—Si linkages
    • C07F7/18—Compounds having one or more C—Si linkages as well as one or more C—O—Si linkages
    • C07F7/1896—Compounds having one or more Si-O-acyl linkages
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C307/00—Amides of sulfuric acids, i.e. compounds having singly-bound oxygen atoms of sulfate groups replaced by nitrogen atoms, not being part of nitro or nitroso groups
    • 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
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
    • C07F7/02—Silicon compounds
    • C07F7/08—Compounds having one or more C—Si linkages
    • C07F7/18—Compounds having one or more C—Si linkages as well as one or more C—O—Si linkages
    • C07F7/1804—Compounds having Si-O-C linkages
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/54—Electrolytes
    • H01G11/58—Liquid electrolytes
    • H01G11/62—Liquid electrolytes characterised by the solute, e.g. salts, anions or cations therein
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/145—Liquid electrolytic capacitors
    • 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
    • H01M10/052—Li-accumulators
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/022—Electrolytes; Absorbents
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte
    • H01M2300/0045—Room temperature molten salts comprising at least one organic ion
    • 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
    • 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
    • Y02E60/13—Energy storage using capacitors

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
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  • Electrochemistry (AREA)
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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Secondary Cells (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)

Abstract

There is provided an ionic liquid having attached thereto a silyloxy group. There is also provide methods of making this ionic liquid as well as electrolyte, electrochemical cells and capacitors comprising this ionic liquid.

Description

a TITLE OF THE INVENTION
Ionic Compounds CROSS REFERENCE TO RELATED APPLICATIONS
N/A
FIELD OF THE INVENTION
[001] The present invention relates generally to ionic compounds.
Particularly, the present invention relates to ionic liquids. More particularly, the present invention relates to ionic liquids that can be used in electrochemical cells.
BACKGROUND OF THE INVENTION
[002] Electrolytes in modern electrochemical appliances like lithium ion batteries, electrochromic devices and capacitors are made from various organic solvents containing conductive lithium salts like lithium tetrafluoroborate, lithium hexafluorophosphate, lithium bisoxalatoborate, lithium triflate, lithium bistriflylamide, etc.
Such organic solvents (like alkyl carbonates, acetonitrile, N-methyl-2-pyrrolidone, y-butyrolactone and many others) have a serious disadvantage. They could indeed be ignited and, in the worst cases, overheated appliances may explode and cause fire.
Attempts have been made to circumvent this disadvantage of organic solvents by using ionic liquids (IL) as solvents, as described for example in U.S. Patent Nos.6,365,301 and 6,365,068, U.S. Patent Application Nos 2008/0266642 and 2009/0045373, and PCT publication No. WO 2009/013046.
[003] Existing ionic liquids however do not solve all the problems associated with the manufacturing of electrochemical appliances, especially high power lithium or lithium ion batteries. In batteries, several electrode materials are used, so solvents or electrolytes for use with these materials should exhibit high thermal, electrochemical and chemical stabilities.
[004] Tetralkylammonium salts, including cyclic analogs like piperidinium, nnorpholinium, pyrrolidinium and azepanium, have the widest electrochemical window (see: Wasserscheid, P. and T. Welton, Eds. (2008). Ionic liquids in synthesis Weinheim, Wiley-VCH, pp. 148-155). The most used IL for electronic applications are those containing bis(trifluromethanesulfonyl)amide anions (TFSA or TFSI), which have oxidation stability close to that of BF-4 and PF-6 (Ue, M.; Murakami, A.; Omata, K.; Nakamura, S., On the Anodic Stability of Organic Liquid Electrolytes. Book of Abstracts of 41st Battery Symposium in Japan 2000, 292-293) and exhibit the widest liquid range. Electrochemical intercalation of lithium into graphite anodes in 1-ethyl-3-methylimidazolium (EMI) based ionic liquids has aroused interest because of these ionic liquids low viscosity and high conductivity.
[005] However, these ionic liquids have narrow electrochemical windows (ca 4.2 V). lmidazolium cations are prone to being reduced at the electrode/electrolyte interface when carbon electrode is polarized to 0.7 V vs.
Li/Li+. The strong decomposition reaction of the cations prevents the formation of LiC6 compounds. The addition of a solvent may stabilize and protect the interface between a carbon negative electrode and the ionic liquid phase against an undesirable irreversible reaction with the ionic liquid component. N. Koura, and coworkers [Chem Lett, 12 (2001), pp. 1320-1321 and Abs. 360, IMLB meeting, The Electrochemical Society, Inc: Nara, Japan; 2004] demonstrated the formation LiC6 compound in LiCI¨EMICI¨A1C13 ionic electrolyte containing SOCl2.
Satisfactory results were obtained for various carbonaceous materials.
Holzapfel et aL [Chem Commun, 4 (2004), pp. 2098-2099 and Carbon, 43 (2005), pp. 1488-1498 ] presented the lithium intercalation into an artificial graphite in 1 M solution of LiPF6 in 1-ethyl-3-methyl imidazolium bis(trifluoromethylsulfonyl) imide (EMI-TFSI) containing 5 wt% of vinylene carbonate (VC) as an additive. However, despite many attempts, no pure ionic liquid providing reversible charging¨discharging of a graphitized negative electrode at ambient temperature without any additives has been reported yet. The practical application of the imidazolium derivatives into lithium ion batteries is difficult. Lithium ion batteries using these ionic liquids suffer from relatively small voltage. Graphite material, which is used as a low potential anode material in lithium ion batteries, can cause reduction of unsaturated IL and consequent decomposition, especially of imidazolium and pyridinium based IL.
In some cases, the intercalation of cations of IL has caused the exfoliation of graphite layer. Recently there have been some reports on ionic liquid electrolytes based on bis(fluorosulfonyl)imide (FSI) for rechargeable Li batteries. In particular, FSI-based electrolytes containing Li-ion exhibited practical ionic conductivity, and a natural graphite/Li cell with FSI-based electrolytes containing Li bis(trifluoromethanesulfonyl) imide (LiTFSI) showed cycle performance without any solvent, as described in [Journal of Power Sources 162 (2006) 658-662] using 1-ethy1-3-methylimidazolium (EM1m)-FSI and EMIm-TFSIc and [Journal of Power Sources 175 (2008) 866-873]
using IL based on bis(fluorosulfonyl)imide (FSI) as anion and 1-ethyl-3-methylimidazolium (EMI) and N-methyl-N-propylpyrrolidinium (Py13) as cations. It has further been observed that IL with TFSI anion cannot be used alone with graphite electrodes, because only very low capacities could be reached. The use of stabilizing agents like lithium bis(fluorosulfonyl)amide (FSI) in electrolyte and the preparation of IL
containing fluorosulfonyl trifluoromethanesulfonylamide (FTI) was proposed, but these solutions are economically not practicable due to the high cost of LiFSI salt and complicated synthesis method.
[006]
Also, choline-like compounds, possessing 2-hydroxyethyl group, could have been of special interest because they are able to form deep eutectic mixtures, but they are not suitable for use in electrochemical appliances with high operating voltage because of the presence of labile acidic hydroxyl group. Methylation of hydroxyl group in choline like compound improves their stability. Improvement of stability of various oligoethylene glycols was achieved by the protection of terminal hydroxyl group by various siloxygroups, such as trimethylsilyl group (Zhang, Z.; Dong, J.; West, R.; Amine, K., Oligo(ethylene glycol)-functionalized disiloxanes as electrolytes for lithium-ion batteries. Journal of Power Sources 2010, 195 (18), 6062-6068). The preparation of silylated choline compounds is disclosed in Lukevics, E.; Liberts, L.; Voronkov, M. G., Organosilicon Derivatives of Aminoalcohols. Russian Chemical Reviews 1970, 39(11), 953-963. JP 2010-095473A
discloses ionic compounds containing trialkylsilyl moities and their use as antistatic agents for low surface energy polymers (PTFE). The prepared antistatic agents were mostly solid at room temperature.
[007] There is thus a need for novel ionic compounds or ionic liquids for use in electrolytes and electrochemical cells.
SUMMARY OF THE INVENTION
[008] In accordance with the present invention, there is provided:
1. An ionic compound having attached thereto a silyloxy group.
2. An ionic liquid having attached thereto a silyloxy group.
3. The ionic compound or ionic liquid of item 1 or 2 being of formula (1):
CAT+
AN I- \I.

(I) , wherein:
CAT + is a cation containing positively charged atom which is nitrogen, phosphorus or sulfur;
R, R, and R2 are independently Cl-C8 alkyl, alkenyl or alkynyl groups, preferably Cl-C8 alkyl groups, preferably C1-C4 alkyl and alkenyl groups, and most preferably C1-C2 alkyl groups;
L represents a bond or a linker, and ANI- represents a single charged anion.
4. The ionic compound or ionic liquid of item 3, wherein L is a Cl-C12 alkylene, alkenylene, or alkynylene group, optionally comprising one or more ether function, and optionally substituted with one or more halogen atoms.
5. The ionic compound or ionic liquid of item 4, wherein L is a Cl-C12 alkylene group.
6. The ionic compound or ionic liquid of item 5, wherein L is a C2-C6 alkylene group.
7. The ionic compound or ionic liquid of item 6, wherein L is a C2-C4 alkylene group.
8. The ionic compound or ionic liquid of item 7, wherein L is -CH2-CH2-.
9. The ionic compound or ionic liquid of any one of items 1 to 8, wherein the cation of the ionic compound or ionic liquid is of formula (11a), (11b) or (11c):

R" R3 4 I+ \
R¨N-- W-131¨ S¨

I 5 I c R" R4 (11a), (11b) (11c) wherein R3, R4 and R5 are independently C1-C16 alkyl, alkenyl, or allrynyl groups, preferably Cl-C8 alkyl or alkenyl groups, and most preferably C1-C4 alkyl groups.
10. The ionic compound or ionic liquid of any one of items 1 to 8, wherein the cation of the ionic compound or ionic liquid is of formula (111a) (111b) or (111c):
Re Pi (111a), (111b) (111c) wherein IR, is a Cl-C16 alkyl, alkenyl, or alkynyl group, preferably a CI-Ca alkyl or alkenyl group, and most preferably a Cl-C4 alkyl group; and X is a combination of one or more of ¨CH2¨, ¨0¨, and ¨N(CH3)¨ so that CAT + is a cation of the azetidinium, pyrrolidonium, piperidinium, azepanium, morpholinium, isomorpholinium or piperazinium type.
11. The ionic compound or ionic liquid of any one of items 1 to 8, wherein the cation of the ionic compound or ionic liquid is of formula (IV):
(IV), wherein Z is a combination of one or more of ¨CH2¨, ¨CH., ¨0¨, ¨N(alkyl)¨ and ¨N= so that CAT + is a cation of the azetinium, 3,4-dihydro-2H-pyrolium, pyridinium, azepinium, pyrimidinium, piperazinium, imidazolium, or pyrazolium type.
12. The ionic compound or ionic liquid of any one of items 1 to 11, wherein the anion of the ionic compound or ionic liquid is perchlorate, hexafluorophosphate, tris(pentafluoroethyl)trifluorophosphate, tetrafluoroborate, trifluoromethyltrifluoroborate, pentafluoroethyltrifluoroborate, heptafluoropropyltrifluoroborate, nonafluorobutyltrifluoroborate, trifluoromethanesulfonate, trifluoroacetate, bis(fluorosulfonyl)amide, bis(trifluoromethanesulfonyl)amide, bis(pentafluoroethylsulfonyl)amide, bis(heptafluoropropylsulfonyl)amide, bis(nonafluorobutylsulfonyl)amide, N-trifluoroacetyl-fluorosulfonylamide, N-trifluoroacetyl-trifluoromethanesulfonylamide, N-trifluoroacetyl- pentafluoroethylsulfonyl amide, N-trifluoroacetyl-heptafluoropropylsulfonylamide, N-trifluoroacetyl-nonafluorobutylsulfonylamide, N-fluorosulfonyl-trifluoromethanesulfonylamide, N-fluorosulfonyl- pentafluoroethylsulfonyl amide, N-fluorosulfonyl-heptafluoropropylsulfonylamide, N-fluorosulfonyl-nonafluorobutylsulfonylamide, N-trifluoromethanesulfonyl-pentafluoroethylsulfonyl amide, N-trifluoromethanesulfonyl-heptafluoropropylsulfonylamide or N-trifluoromethanesulfonyl-nonafluorobutylsulfonylamide.
13. The ionic compound or ionic liquid of item 12, wherein the anion of the ionic compound or ionic liquid is bis(fluorosulfonyl)amide, bis(trifluoromethanesulfonyl)amide, or N-fluorosulfonyl-trifluoromethane-sulfonylamide
14. The ionic compound or ionic liquid of item 13, wherein the anion of the ionic compound or ionic liquid is bis(trifluoronnethanesulfonyl)amide.
15. An electrolyte comprising at least one ionic compound or ionic liquid as defined in any one of items 1 to 14 and a conducting salt.
16. The electrolyte of item 15 further comprising an organic solvent.
17. The electrolyte of item 16, wherein the organic solvent is a polar organic solvent.
18. The electrolyte of any one of items 15 to 17, further comprising an unsaturated carbonate.
19. An electrochemical cell comprising an anode, a cathode, and an electrolyte as defined in any one of items 15 to 18.
20. The electrochemical cell of item 19 being part of a battery.
21. The electrochemical cell of item 19 being part of a capacitor.
22. The electrochemical cell of item 19 being part of an electrochromic device.
BRIEF DESCRIPTION OF THE DRAWINGS
[009] In the appended drawings:
[0010] Figure 1 shows the cyclic voltametry of N1112-0TMS-TFSI;
[0011] Figure 2 shows the cyclic voltametry of N1122-0TMS-TFSI;
[0012] Figure 3 shows the cyclic voltametry of N1122-0TMS-TFSI+LiTFSI;
[0013] Figure 4 shows the charge-discharge curves of LiFePO4 with N1122-0TMS-TFSI;
[0014] Figure 5 shows the charge-discharge curves graphite with N1122-0TMS-TFSI;
[0015] Figure 6 shows the cyclic voltametry of N1132-0TMS-TFSI;
[0016] Figure 7 shows the cyclic voltametry of N1132-0TMS-TFSI+LiTFSI;
[0017] Figure 8 shows the charge-discharge curves of LiFeP0.4 with N1132-0TMS-TFSI;
[0018] Figure 9 shows the cyclic voltametry of N2222-0TMS-TFSI;
[0019] Figure 10 shows the cyclic voltametry of N2222-0TMS-TFSI+LiTFSI;
[0020] Figure 11 shows the cyclic voltametry of N1222-0TMS-TFSI;
[0021] Figure 12 shows the cyclic voltametry of N1222-0TMS-TFSI+LiTFSI;
[0022] Figure 13 shows the charge-discharge curves of graphite with N1222-0TMS-TFSI;
[0023] Figure 14 shows the charge-discharge curves of SiOx with N1122-0TMS-TFSI;
[0024] Figure 15 shows the viscosity of the ionic compounds or ionic liquids at different temperatures; and
[0025] Figure 16 shows the conductivity of the ionic compounds or ionic liquids at different temperatures.
DETAILED DESCRIPTION OF THE INVENTION

Ionic compounds, or Ionic Liquids
[0026] Turning now to the invention in more details, there is provided an ionic compound or an ionic liquid having attached thereto at least one silyloxy group. In embodiment, the ionic compound or ionic compound or ionic liquid comprising one such silyloxy group.
[0027] Herein, "ionic liquid" (IL) refers to a salt (comprising anions and cations) that is in a molten state at low temperature, for example below 100 C and preferably at room temperature. There are many classes of ionic liquids. The ionic liquid that is part of the invention can be any ionic liquid known in the art. It may also be any derivative of these ionic liquids. Non-limiting examples of derivatives of ionic liquids includes cations where substituents or side chains have been added. Side chains can include alkyl, alkoxy, and alkoxylakyl chains.
[0028] In the ionic compouns or ionic liquid of the invention, the silyloxy group is attached to the cation of the ionic liquid via covalent bonds. The silyloxy may be attached through a single bond or through a linker.
[0029] Herein, a "silyloxy" group is any univalent radical of general formula (R')(R")(R")Si-0-. In embodiments, the siloxy group is a trialkylsiloxy group (i.e. R', R" and R" are all alkyl groups).
[0030] In embodiments, the ionic compound or ionic liquid is of formula (I):
CAT+
AN I-\ 1 L-0 ¨Si ¨R

R (I) , wherein:
CAP is a cation containing positively charged atom which is nitrogen, phosphorus or sulfur;
R, R, and R2 are independently C1-C8 alkyl, alkenyl or alkynyl groups, preferably C1-C8 alkyl groups, preferably C1-C4 alkyl and alkenyl groups, and most preferably C1-C2 alkyl groups;
L represents a bond or a linker, and ANI- represents a single charged anion.
[0031] In embodiments, L is a linker, preferably a Cl-C12 alkylene, alkenylene, or allrynylene group, optionally comprising one or more ether function, and optionally substituted with one or more halogen atoms. In further embodiments, L is a C1 -C12 alkylene group, preferably a C2-C6 alkylene group, preferably a C2-C4 alkylene group, and preferably -CH2-CH2-.
[0032] In embodiments, the cation of the ionic compound or ionic liquid (identified as CAP in formula (I) above) is of formula (II):

R 00, wherein 133, R4 and R5 are independently C1-C16 alkyl, alkenyl, or alkynyl groups, preferably C1-C8 alkyl or alkenyl groups, and most preferably 01-04 alkyl groups.
[0033] In embodiments, the cation of the ionic compound or ionic liquid is of formula (III):

(III), wherein R6 is a C1-C16 alkyl, alkenyl, or alkynyl group, preferably a C1-C8 alkyl or alkenyl group, and most preferably a C1-C4 alkyl group; and X is a combination of one or more of ¨CH2¨, ¨0¨, and ¨N(CH3)¨ so that CAT+
is a cation of the azetidinium, pyrrolidonium, piperidinium, azepanium, morpholinium, isomorpholinium or piperazinium type.
[0034] In embodiments, the cation of the ionic compound or ionic liquid is of formula (IV):
Z/N4L¨

(IV), wherein Z is a combination of one or more of ¨CH2¨, ¨CH., ¨0¨, ¨N(alkyl)¨ and ¨N-= so that CAT + is a cation of the azetinium, 3,4-dihydro-2H-pyrolium, pyridinium, azepinium, pyrimidinium, piperazinium, imidazolium, or pyrazollum type.
[0035] In embodiments, the anion of the ionic compound or ionic liquid (identified as ANI- in formula (I) above) is perchlorate, hexafluorophosphate, tris(pentafluoroethyl)trifluorophosphate, tetrafluoroborate, trifluoromethyltrifluoroborate, pentafluoroethyltrifluoroborate, heptafluoropropyltrifluoroborate, nonafluorobutyltrifluoroborate, trifluoromethanesulfonate, trifluoroacetate, bis(fluorosulfonyl)amide, bis(trifluoro-methanesulfonyl)amide, bis(pentafluoroethylsulfonyl)amide, bis(heptafluoropropylsulfonyl)amide, bis(nonafluorobutylsulfonyl)amide, N-trifluoroacetyl-fluorosulfonylamide, N-trifluoroacetyl-trifluoromethanesulfonylamide, N-trifluoroacetyl-pentafluoroethylsulfonyl amide, N-trifluoroacetyl-heptafluoropropylsulfonylamide, N-trifluoroacetyl-nonafluorobutylsulfonylamide, N-fluorosulfonyl-trifluoromethan-esulfonylamide, N-fluorosulfonyl- pentafluoroethylsulfonyl amide, N-fluorosulfonyl-heptafluoropropylsulfonylamide, N-fluorosulfonyl-nonafluorobutylsulfonylamide, N-trifluoromethanesulfonyl-pentafluoroethylsulfonyl amide, N-trifluoromethanesulfonyl-heptafluoropropylsulfonylamide or N-trifluoromethanesulfonyl-nonafluorobutylsulfonylamide.
[0036] In preferred embodiments, the anion of the ionic compound or ionic liquid is bis(fluorosulfonyl)amide, bis(trifluoromethanesulfonyl)amide, or N-fluorosulfonyl-trifluoromethanesulfonylamide, and preferably bis(trifluoro-methanesulfonyl)amide (TFSI).
[0037] Ionic compounds or ionic liquids where L is a linear alkylene linker can be represented by the following general formula (V):

CAT+
ANI-\ I
0 ¨Si ¨R

R (V), wherein CAT, ANI-, R, R1 and R2 are as defined above and wherein m is an integer varying from 0 to 10, preferably from 1 to 5 and most preferably from 1 to 3.
Uses of the Ionic compounds or Ionic Liquids of the Invention
[0038] The ionic compounds or ionic liquids of the invention can, in embodiments, be used as electrolytes in electrochemical cells like batteries, electrochromic devices and capacitors.
Such electrochemical cells comprise an anode, a cathode, and an electrolyte. It is preferable that the ionic compounds or ionic liquids be liquid at the temperature of operation of the specific electrochemical appliance they are destined to. It is possible to prepare such electrolytes from pure ionic compounds or ionic liquids or from a mixture of at least two ionic compounds or ionic liquids of the invention.
[0039] To prepare electrolytes from these ionic compounds or ionic liquids, an appropriate conducting salt should be dissolved in them. For use in lithium and lithium ion batteries, lithium salts can be dissolved in an appropriate concentration, for example between 0.05 and 3 mol/litre. Non-limiting examples of lithium salts include perchlorate, tetrafluoroborate, hexafluorophosphate, bis(fluorosulfonyl)amide, bis(trifluoromethan-sulfonyl)amide and their derivatives. When the electrolyte is to be used in a different type of electrochemical device, other salts can be dissolved in the ionic liquid(s), for example sodium and potassium salts.
[0040] Various additives can be added to the electrolyte to improve its properties. For example, to diminish viscosity and increase conductivity, one or more organic solvents, especially polar solvents like alkyl carbonates, can be added, for example in a quantity varying from about 1 to about 80% of the total mass of electrolyte.
[0041] To improve stability at high and low voltages, unsaturated carbonates, like vinylene carbonate and derivatives of ethane (that is vinyl compounds) can be added, for example at a concentration of from about 0.1 to about 15 percent of weight based on the total weight of the electrolyte.
[0042] In embodiments, especially those containing a TFSI anion, electrolytes containing the ionic compound or ionic liquid of the invention have good compatibility with graphite electrodes, such as those used in lithium ion batteries. These can, in embodiments, provide reversible charging-discharging of a graphitized negative electrode at ambient temperature without or with reduced decomposition of the ionic compound or ionic liquid, and with the formation of an adequate passivation layer around the graphite particles of the electrode.
Methods of Making the Ionic compounds or Ionic Liquids of the Invention
[0043] The room temperature ionic compounds or ionic liquids possessing triallrylsiloxy group of the invention can be prepared in three steps:
i) preparation of an onium salt with a simple anion (like halogenide or sulphate), ii) anion metathesis, where the simple anion is exchanged by a more complex anions like triflate, tetrafluoroborate, hexafluorophosphate, bis(fluorosulfonyl)amide, bis(trifluoromethanesulfonyl)amide, or tris(pentafluoroethyl)trifluorophosphate, and iii) introduction of the trilakylsilyl group into the molecule.
In some cases, direct preparation of choline salts with more complex anions can be realized in one step, without anion metathesis.
[0044] The choline-like tetraalkylammonium salts can be prepared using various procedures:
Step i) Qualemisafion of N,N-dialky1-2-aminoethanol, or its longer chain analogues
[0045] Choline analogues can be prepared by quaternisation of N,N-dialky1-2-aminoethanol, or its longer chain analogues, like N,N-dia141-3-aminopropanol, with appropriate alkylating agents.
[0046] Alkyl halogenides can be used as starting materials. The chlorides are not very reactive. Therefore, when they are used hreaction temperatures are needed and may result in the deterioration of the product and contamination with coloured impurities that may be hard to remove. Alkyl iodides are very reactive, but the resulting iodide anion can easily be oxidized to iodine, which causes undesired coloration and contamination of the product. Alkyl bromides represent a good compromise between their reactivity and the stability of the final product. For introduction of methyl or ethyl group into the molecule, dimethyl sulphate and diethyl sulphate are also reagents of choice. For special alkyl groups, alkyl mesylates or tosylates can be used.
[0047] N,N-dialky1-2-aminoethanol, or its longer chain analogues, like N,N-dialky1-3-aminopropanol, is dissolved in an inert solvent like acetonitrile, toluene, THF, or an ether, and a alkylating agent is added at such rate that a certain reaction temperature is maintained. The quaternization reaction is in many cases very exothermic so great care must be paid during the addition. The reaction temperature should be as low as possible to suppress impurity formation, but if chlorides are used as alkylating agents, the reaction will be slow even in boiling toluene.
After the reaction is complete, the resulting salt is isolated. In most cases, this can be done by addition of ethyl acetate to facilitate the precipitation of the solid product and its filtration. If the product is liquid, the solvent is removed by evaporation and the remaining liquid washed with a solvent that dissolves the starting compounds but does not dissolve products. The most appropriate solvents for this type of purification are generally ethers or ethyl acetate. The product can be purified by recrystallization from a suitable solvent like water, acetonitrile, acetone or an alcohol or a mixture thereof.
[0048] The scheme for this reaction is:

3 iJ.ft ¨11 R 5 solvent, A X

X= CI, Br,!, 0503R, 0502R
wherein R3, 114, R5 and m are as defined above.
Quatemisation of trialkylamines with a derivative of ethanol or other aliphatic alcohol
[0049] The quaternisation of trialkylamines can be effected with a derivative of ethanol or other aliphatic alcohol;
especially with 2-chloro or 2-bromoethanol and 3-halopropanol. Bronno derivatives are more reactive so lower temperatures are needed and the reaction proceeds smoothly without formation of impurities. This method is especially suitable for preparation of cyclic analogues like imidazolium, piperidinium, morpholinium, pyrrolidinium and azepanium salts.
[0050] Trialkyl amine and w-haloalcohol are reacted at elevated temperature, for example at the boiling point of reaction mixture, in suitable solvent like acetonitrile, toluene, THF, or an ether. The scheme of this reaction is as follows:
H

4 I 4. 3 5 R ¨N ¨R
N
R solvent, A X ______ \
X= CI, Br, I OH
wherein R3, Ra, R5 and m are as defined above.
Reaction between trialkylammonium salts and ethylene oxide
[0051] A third option is to react a trialkylammonium salt with ethylene oxide in a pressure reactor. The scheme of this reaction is as follows:

______________________________________ Dm- X
I 3 solvent, A
x- R
OH
X= CI, Br, I, NO3, CF3C00, CF3S03...
wherein R3, Ra, and R5 are as defined above.
[0052] In cases where the trialkylammonium salt comprises a complex anion, a desired room temperature IL
can be prepared in a single step without anion metathesis.

Step ii) Anion Metathesis
[0053] In this step, the anion of an onium salt, produced by quaternisation, is exchanged for a desired usually more complex, more stable and less associative anion. This procedure usually makes the onium salt liquid.
Usually, highly fluorinated anions like tetrafluoroborate, hexafluorophosphate, triflate, bis(fluorosulfonyl)amide (FSI), bis(trifluoromethanesulfonyl)amide (TFSA), tris(pentafluoroethyl)trifluorophosphate (FAP) are introduced into the structure of ionic compound or ionic liquid. Sources of these anions can be free acids or their salts, preferably salts of alkali metals.
[0054] The onium salt and the source of the desired anion are mixed in an appropriate solvent, which can be for example water or an organic solvent. The driving force of metathesis is a rapid ionic reaction, that is the formation of a poorly dissociated compound (precipitate, gas) or the separation of a reaction mixture in two layers (that is the precipitation of an insoluble liquid).
[0055] FSI, TFSI and FAP are very hydrophobic, so anion metathesis can be performed in water where the resulting ionic compound or ionic liquid separates as denser layer. To remove the impurities, a simple wash with water is required. In some cases, anion metathesis can be performed in organic solvents, especially when the desired ionic compound or ionic liquid is soluble in water and performing anion exchange in water could result in loss of part of the ionic compound or ionic liquid.
[0056] The use of the terms "a" and "an" and "the" and similar referents in the context of describing the invention (especially in the context of the following claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context.
[0057] The terms "comprising", "having", "including", and "containing" are to be construed as open-ended terms (i.e., meaning "including, but not limited to") unless otherwise noted.
[0058] Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. All subsets of values within the ranges are also incorporated into the specification as if they were individually recited herein.
[0059] All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context.
[0060] The use of any and all examples, or exemplary language (e.g., "such as") provided herein, is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention unless otherwise claimed.
[0061] No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention.
[0062] Herein, the terms "alkyl", "alkylene", "alkenyl", "alkenylene", "alkynyl", "alkynylene" and their derivatives (such as alkoxy) have their ordinary meaning in the art. It is to be noted that, unless otherwise specified, the hydrocarbon chains of these groups can be linear or branched. Further, unless otherwise specified, these groups , can contain between 1 and 18 carbon atoms, more specifically between 1 and 12 carbon atoms, or between 1 and 6 carbon atoms.
[0063] Herein, the term "about" has its ordinary meaning. In embodiments, it may mean plus or minus 10% of the numerical value qualified.
[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
[0065] Other objects, advantages and features of the present invention will become more apparent upon reading of the following non-restrictive description of specific embodiments thereof, given by way of example only with reference to the accompanying drawings.
DESCRIPTION OF ILLUSTRATIVE EMBODIMENT
[0066] The present invention is illustrated in further details by the following non-limiting examples.
Example 1 - N-(2-trimethylsiloxyethyl)-N,N,N-trimethylammonium bis(trifluoro methane sulfonyl)amide (N1112-0TMS-TFS0 F\.F
F\ 0 ,s 0 F
() \ _ II

N S __ F
II
\
N+ 0 F
/ \ \
H3C CH3 ______________________________ 0 \ .CH3 SI
H3C \CH3 Choline bis(trifluoromethanesulfonyl)amide:
[0067] 55.85 g (0.4 mol) of choline chloride (Sigma-Aldrich) were dissolved in 150 ml of MQ water and, under vigorous stirring, was mixed with a solution of 120 g (0.41mol) of lithium bis(trifluoromethanesulfonyl)amide (LiTFSI) in 200 ml of MO water. Phase separation occurred at once, but the stirring was continued for another 5 hours at room temperature. Then 100 ml of CH2Cl2 were added and the phases were separated. The water phase was extracted with 50 ml of CH2Cl2 and the combined organic phases were washed 6 times with 50 ml of MO water. A clear colourless solution was obtained. This was poured into a round bottom flask; the solvent was removed using a rotary evaporator and then under high vacuum at 60 C. In this manner, 127 g (83 c/o) of pure choline bis(trifluoromethanesulfonyl)amide (choline TFSI) were obtained.
[0068] 1H NMR (300 MHz, DMSO-c16) 6/ppm: 3.11 (s, 9 H), 3.31 - 3.47 (m, 2 H), 3.84 (tt, J=5.03, 2.29 Hz, 2 H), 5.26 (t, J=4.94 Hz, 1 H).
[0069] 13C NMR (75 MHz, DMSO-d6) 6/ ppm: 53.30 (br. t, J=3.50, 3.50 Hz), 55.31 (s), 67.18 (br. t, J=3.20, 3.20 Hz), 119.63 (q, J=321.70 Hz).

N-(2-trimethylsiloxyethyl)-N,N,N-trimethylammonium bis(trifluoromethanesulfonyl)amide
[0070] To a 500 ml round bottom flask containing 127 g (0.33 mol) of neat choline TFSI, 53 g (0.33 mol) of hexamethyldisilazane (HMDS) were added at room temperature as a gentle stream of nitrogen was passed through the apparatus to facilitate removal of forming ammonia. The mixture was slowly heated to 60-70 C and stirred so that a fine emulsion of HMDS in choline TFSI was formed. A vigorous evolution of gaseous ammonia started close to 60 C and ended after a few minutes. The mixture was heated and stirred for additional 4 hours after the end of this vigorous reaction. Then, the remaining HMDS, which was in a separate layer on top of desired product, was evaporated under high vacuum. The round bottom flask was then refilled 6 times with argon and again evacuated. The product was heated to 70 C during this manipulation.
Finally the apparatus was cooled down under vacuum and refilled with argon. In this manner, 150.5 g (100 %) of the title compound in the form of a colourless liquid were obtained.
[0071] 1H NMR (300 MHz, CHLOROFORM-d) 6/ppm: 0.10 (s, 9 H), 3.14 (s, 9 H), 3.38 - 3.49 (m, 2 H), 3.87 -4.03 (m, 2 H).
[0072] 130 NMR (75 MHz, CHLOROFORM-d) 6/ppm: -1.28 (s), 54.22 (t, J=3.50 Hz), 56.67 (s), 67.56 (t, J=3.20 Hz), 119.63 (q, J=320.70 Hz).
Example 2 - N-ethyl-N-(2-trimethylsiloxyethyl)-N,N-dimethylammonium bis(trifluoromethane sulfonyl)amide (N1122-0TAIS-TFS0 F\F
F\

( N S ____ N+

/
CH3 ______________________________ 0 .,CH3 SI

N-ethyl-N-2-hydroxyethyl-N,N-dimethylammonium bromide
[0073] In a 500 ml round bottom flask equipped with a magnetic stirrer were placed 45.3 g (0.508 mol) of 2-dimethylaminoethanol dissolved in 150 ml of MeCN. To this solution, a mixture of 61.5 g (0.550 mol) ethyl bromide and 60 ml of MeCN was added dropwise over a period of 1.5 h using a water bath (at 20 C) for cooling during the addition. After half the EtBr was added, a snow white crystalline product started to precipitate from the solution. The mixture was stirred over a weekend (57 h), vacuum filtered washed with a small amount of acetone and then dried in a vacuum oven at 60 C. The filtrate was evaporated to dryness and additional product was isolated. Altogether, 98.13 g (72 c/o) of N-ethyl-N-2-hydroxyethyl-N,N-dimethylammoniunn bromide were obtained.
[0074] 1H NMR (300 MHz, DEUTERIUM OXIDE) 6/ppm: 1.35 (tt, J=7.28, 1.88 Hz, 3 H), 3.11 (s, 6 H), 3.38 -3.52 (m, 4 H), 3.95 - 4.07 (m, 2 H).
[0075] 13C NMR (75 MHz, DEUTERIUM OXIDE) 6/ppm: 7.24 (s), 50.38 (t, J=3.90 Hz), 54.92 (s), 60.57 (t, J=2.70 Hz), 63.94 (t, J=3.30 Hz) N-ethyl-N-2-hydroxyethyl-N,N-dimethylammonium bis(trifluoromethanesulfonyl)amide
[0076] In a 250 ml round bottom flask, solutions of 52 g (0.263 mol) of N-ethyl-N-2-hydroxyethyl-N,N-dimethylammonium bromide in 70 ml MO water and 78 g (0,274 mol) of LiTFSI in 80 ml MO water were mixed under vigorous stirring. Phase separation occurred at once, but stirring was continued for another 4 hours at room temperature. Then, 100 ml of CH2Cl2 were added and the phases separated. The water phase was extracted with 50 ml of CH2Cl2 and the combined organic phases were washed 6 times with 100 ml of MO water. A clear colourless solution was obtained and poured into a round bottom flask. The solvent was removed using a rotary evaporator and then under high vacuum at 60 C. In this manner, 70 g (67 %) of pure N-ethyl-N-2-hydroxyethyl-N,N-dimethylammonium bis(trifluoromethanesulfonyl)amide as a colourless liquid were obtained.
[0077] 1H NMR (300 MHz, DMSO-d6) 6/ppm: 1.25 (br. t, J=7.30, 7.30 Hz, 3 H), 3.03 (s, 39 H), 3.28 - 3.46 (m, 26 H), 3.56 (s, 12 H), 3.75 -3.91 (m, 13 H), 5.29 (t, J=4.94 Hz, 6 H).
[0078] 13C NMR (75 MHz, DMSO-d6) 6/ppm: 7.63 (s), 50.23 (t, J=3.50 Hz), 54.96 (s), 59.50 - 60.18 (m), 64.19 (t, J=2.49 Hz), 119.50 (q, J=321.20 Hz).
N-ethyl-N-(2-trimethylsiloxyethyl)-N,N-dimethylammonium bis(trifluoromethanesulfonyl)amide
[0079] To a 250 ml round bottom flask containing 80 g (0.20 mol) of neat N-ethyl-N-2-hydroxyethyl-N,N-dimethylammonium TFSI, 31 g (0.20 mol) of hexamethyldisilazane (HMDS) were added at room temperature as a gentle stream of nitrogen was passed through the apparatus to facilitate removal of forming ammonia. The mixture was slowly heated to 60-70 C and stirred so that a fine emulsion of HMDS in IL formed. A vigorous evolution of gaseous ammonia started close to 60 C and ended after a few minutes. The mixture was heated and stirred for an additional 4 hours after the end of vigorous reaction.
Then, the remaining HMDS, which was in a separate layer on top of the desired product, was evaporated under high vacuum. The round bottom flask was then refilled 6 times with argon and again evacuated. The product was heated to 70 C during this manipulation.
Finally, the apparatus was cooled down under vacuum and refilled with argon.
In this manner, 94 g (100%) of the title compound in the form of a colourless liquid were obtained.
[0080] 1H NMR (300 MHz, CHLOROFORM-d) 6/ppm: 0.10 (s, 9 H), 1.34 (br. t, J=7.10, 7.10 Hz, 3 H), 3.06 (s, 6 H), 3.32 - 3.51 (m, 4 H), 3.86 -4.04 (m, 2 H).
[0081] 13C NMR (75 MHz, CHLOROFORM-d) 6/ppm: -1.25 (s), 7.94 (s), 50.96 (t, J=3.59 Hz), 56.43 (s), 61.46 (br. s.), 64.54 (br. s.), 119.67 (q, J=321.20 Hz).
[0082] 19F NMR (470 MHz, CHLOROFORM-d) 6/ppm: -78.89 (s).

Example 3 - N,N-diethyl-N-(2-trimethylsiloxyethyl)-N-methylammonium bis(trifluoro methanesulfonyl)amide (N1222-0TM-TFSI) F\F
F\

(N ¨S __ H3C0N+
. FCH3 HC
kan3 N,N-diethyl-N-2-hydroxyethyl-N-methylammonium methylsufate
[0083] In a 1L round bottom flask equipped with a magnetic stirrer were placed 117.10 g (1 mol) of 2-diethylaminoethanol dissolved in 250 ml of MeCN. The solution was cooled below 20 C with the help of an ice water bath. To the cooled solution, a mixture of 130 g (1.03 mol) dimethyl sulfate and 100 ml of MeCN was added dropwise over a period of 0.5 h, not allowing the temperature to rise above 40 C. The mixture was stirred over a weekend (60 h) and MeCN was then removed using a rotary evaporator. 242 g (100 %) of N,N-diethyl-N-2-hydroxyethyl-N-methylammonium methylsulfate were obtained in the form of a slightly pink coloured oil.
[0084] 1H NMR (300 MHz, DMSO-c16) 6/ppm: 1.20 (t, J=7.14 Hz, 6 H), 2.96 (s, 3 H), 3.28 - 3.40 (m, 6 H), 3.40 (s, 3 H), 3.74 - 3.85 (m, 2 H), 5.09 (br. s., 1 H).2
[0085] 13C NMR (75 MHz, DMSO-c16) 6/ppm: 7.64 (s), 47.22 (br. s), 53.16 (s), 54.91 (s), 56.50 (br. s), 61.26 (br.
s).
N,N-diethyl-N-2-hydroxyethyl-N-methylammonium bis(trifluoromethanesulfonyl)amide
[0086] In a 250 ml round bottom flask, solutions of 68.58 g (0.282 mol) of N,N-diethyl-N-2-hydroxyethyl-N-methylammonium methylsufate dissolved in 70 ml MO water and 83.23 g (0,290 mol) of LiTFSI dissolved in 80 ml MO water were mixed under vigorous stirring. Phase separation occurred at once, but the stirring was continued for another 6 hours at room temperature. Then, 100 ml of CH2Cl2 were added and the phases separated. The water phase was extracted with 20 ml of CH2Cl2 and the combined organic phases were washed 6 times with 80 ml of MO water. To this solution, 5 g of activated charcoal were added and this mixture was heated to its boiling point, allowed to cool down and stirred overnight (16h). The next morning, the solution was filtered through a PTFE filter of 0,22 pm porosity. A clear solution was obtained and poured into a round bottom flask. The solvent was removed using a rotary evaporator and then under high vacuum at 60 C. In this manner, 65.65 g (56 A)) of pure N,N-diethyl-N-2-hydroxyethyl-N-methylammonium bis(trifluoromethanesulfonyl)amide as a colourless liquid were obtained.
[0087] 1H NMR (300 MHz, DMSO-d6) 6/ppm: 1.20 (t, J=7.14 Hz, 6 H), 2.96 (s, 3 H), 3.28 - 3.40 (m, 6 H), 3.40 (s, 3 H), 3.74 - 3.85 (m, 2 H), 5.09 (br. s., 1 H).
[0088] 130 NMR (75 MHz, DMSO-d6) 6/ppm: 7.48 (s), 47.28 (br. s.), 54.87 (s), 56.60 (br. s.), 61.48 (br. s.), 119.65 (q, J=321.20 Hz).
N,N-diethyl-N-2-hydroxyethyl-N-methylammonium bis(trifluoromethanesulfonyl)amide
[0089] To a 250 ml round bottom flask containing 65 g (0.159 mol) of neat N,N-diethyl-N-2-hydroxyethyl-N-methylammonium bis(trifluoromethanesulfonyl)amide, 25.69 g (0.160 mol) of hexamethyldisilazane (HMDS) were added at room temperature as a gentle stream of nitrogen was passed through the apparatus to facilitate removal of forming ammonia. The mixture was slowly heated to 60-70 C and and stirred so that a fine emulsion of HMDS
in IL formed. A vigorous evolution of gaseous ammonia started close to 60 C
and ended after a few minutes.
The mixture was heated and stirred overnight (16 hours after the end of the vigorous reaction). Then, the remaining HMDS, which was in separate layer on top of the desired product, was evaporated under high vacuum.
A slightly coloured oil was obtained and diluted with 100 ml of CH2C12 5 g of activated charcoal were added. The mixture was heated to its boiling point, cooled to room temperature and filtered after 1h through a 0.22 pm PTFE
filter. The solvent was removed using a rotary evaporator and then 5 ml of fresh HMDS were added to clear product. The mixture was vigorously stirred and heated to 70 C for one hour.
Then, the volatile compounds were removed in vacuo and the flask was refilled 6 times with argon and again evacuated. The product was heated to 70 C during this manipulation. Finally, the apparatus was cooled down under vacuum and refilled with argon. In this manner, 72 g (93 c/o) of the title compound in the form of a colourless liquid were obtained.
[0090] 1H NMR (300 MHz, CHLOROFORM-d) 6/ppm: 0.07 (s, 9 H), 1.27 (t, J=7.14 Hz, 6 H), 2.94 (s, 3 H), 3.25 - 3.43 (m, 6 H), 3.81 - 3.98 (m, 2 H).
[0091] 130 NMR (75 MHz, CHLOROFORM-d) 6/ppm: -1.37 (s), 7.47 (s), 47.74 (br.
s.), 56.10 (s), 57.56 (br. s), 61.60 (br. s.), 119.62 (q, J=321.20 Hz).
Example 4 - N,N,N-triethyl-N-(2-trimethylsiloxyethyl)ammonium bis(trifluoromethanesulfonyl)amide (N2222-0TM-TFSI) F\./F
F\

CH30 \N II _____________________________________ -(OF

H3C Si N,N,N-triethyl-N-(2-hydroxyethyl)ammonium bromide
[0092] In a 500 ml round bottom flask equipped with a magnetic stirrer were placed 58.6 g (0.50 mol) of 2-diethylaminoethanol dissolved in 80 ml of MeCN. To this solution, a mixture of 60 g (0.550 mol) ethyl bromide and 40 ml of MeCN was added dropwise over a period of 0.75 h. The mixture was stirred over a weekend (57 h) during which a white crystalline precipitate separated. This precipitate was vacuum filtered, washed with a small amount of acetone and dried in a vacuum oven at 60 C. The filtrate was evaporated to small volume and additional product was precipitated using ethyl acetate. Altogether, 87.51 g (77 c/o) of N,N,N-triethyl-N-(2-hydroxyethyl)ammonium bromide were obtained.
[0093] 1F1 NMR (300 MHz, DMSO-d6) 6/ppm: 1.17 (t, J=7.14 Hz, 9 H), 3.26 - 3.31 (m, 2 H), 3.32 (q, J=7.00 Hz, 6 H), 3.76 (br. d, J=4.80 Hz, 2 H), 5.26 (t, J=5.49 Hz, 1 H)
[0094] 13C NMR (75 MHz, DMSO-d6) 6/ppm: 7.31 (s), 52.72 (br. s), 54.37 (s), 57.67 (br. s).
N,N,N-triethyl-N-(2-hydroxyethyl)ammonium bis(trifluoromethanesulfonyl)amide
[0095] In a 250 ml round bottom flask, solutions of 40 g (0.177 mol) of N,N,N-triethyl-N-(2-hydroxyethyl)ammonium bromide in 70 ml MQ water and 53 g (0,185 mol) of LiTFSI
in 80 ml MQ water were mixed under vigorous stirring. Phase separation occurred at once, but the stirring was continued overnight (16 hours) at room temperature. Then, 100 ml of CH2Cl2 were added and the phases separated. The water phase was extracted with 20 ml of CH2Cl2 and the combined organic phases were washed 6 times with 80 ml of MQ
water. A clear solution was obtained and poured into a round bottom flask. The solvent was first removed using a rotary evaporator and then under high vacuum at 60 C. In this manner, 65.71 g (87 %) of pure N,N,N-triethyl-N-(2-hydroxyethyl)ammonium bis(trifluoromethanesulfonyl)amide as a colourless liquid were obtained.
[0096] 1H NMR (300 MHz, DMSO-d6) 6/ppm: 1.19 (t, J=7.14 Hz, 9 H), 3.19 -3.40 (m, 8 H), 3.79 (d, J=4.76 Hz, 2 H), 5.25 (t, J=5.13 Hz, 1 H).
[0097] 13C NMR (75 MHz, DMSO-d6) 6/ppm: 7.10 (s), 52.95 (br. s.), 54.71 (s), 57.94 (br. s.), 119.69 (q, J=321.20 Hz).
N,N,N-triethyl-N-(2-trimethylsiloxyethyl)ammonium bis(trifluoromethanesulfonyl)amide
[0098] To a 250 ml round bottom flask containing 65 g (0.152 mol) of neat N,N,N-triethyl-N-(2-trimethylsiloxyethyl)ammonium TFSI, 24.5 g (0.152 mol) of hexamethyldisilazane (HMDS) were added at 60 C
as a gentle stream of nitrogen was passed through the apparatus to facilitate removal of forming ammonia. The reaction started 2 minutes after the addition. The mixture was stirred so that a fine emulsion of HMDS in choline TFSI formed. Intense evolution of gaseous ammonia ended after a few minutes, but the mixture was heated and stirred overnight (16 hours after the end of vigorous reaction). Then, the remaining HMDS, which was in separate layer on top of the desired product, was evaporated under high vacuum. The round bottom flask was then refilled times with argon and again evacuated. The product was heated to 70 C during this manipulation. Finally the apparatus was cooled down under vacuum and refilled with argon. In this manner, 75.6 g (100 %) of the title compound in the form of a colourless liquid were obtained.
[0099] 1H NMR (300 MHz, CHLOROFORM-d) 6/ppm: 0.11 (s, 9 H), 1.28 (t, J=7.3 Hz, 9 H), 3.17- 3.50 (m, 8 H), 3.91 (br. s., 2 H)
[00100] 13c NMR (75 MHz, CHLOROFORM-d) 6/ppm: -1.20 (s), 7.23 (s), 53.72 (br.
s.), 56.02 (s), 58.27 (br. s.), 119.76 (q, J=321.20 Hz).
Example 5 - N-(2-trimethylsiloxyethyl)-N,N-dimethyl-N-propylammonium bis(trifluoromethane sulfonyl)amide (N1132-0TMS-TFSI) F\,F
F/\ ,A) s.- 0 F
0 \ - H
H3C N S ______ F
\+ II
ziN
,,õ\\
OF
/ _______________________________ CH3\ __ O\ ,,CH3 H3C Si H3C- \

N-(2-hydroxyethyl)-N,N-dimethyl-N-propylammonium bromide
[00101] In a 1000 ml round bottom flask equipped with a magnetic stirrer were placed 135 g (1.50 mol) of 2-dimethylaminoethanol dissolved in 200 ml of MeCN. The solution cooled considerably during mixing. To this solution, a mixture of 200 g (1.64 mol) of propyl bromide, 80 ml of MeCN and 50 ml toluene was added dropwise over a period of 1h while the temperature was not allowed to exceed 35 C. At first, an addition rate of about 5rn1/min was used, after warming was detected, this rate was reduced to 5 drops/second. The mixture was stirred over a weekend (57 h) during which a small amount of white crystalline precipitate separated. 200 ml of ethyl acetate were added to precipitate the majority of the product, which was then vacuum filtered, washed with a small amount of ethyl acetate and dried in a vacuum oven at 60 C. The filtrate was evaporated to a small volume and additional product was precipitated with ethyl acetate. Altogether, 307 g (96 %) of the title N-(2-hydroxyethyl)-N,N-dimethyl-N-propylammonium bromide were obtained.
[001021 11-I NMR (300 MHz, DMSO-d6) 6/ppm: 0.87 (t, J=7.3 Hz, 3 H), 1.57-1.78 (m, 2 H), 3.08 (s, 6 H), 3.26 -3.37 (m, 2 H), 3.38 - 3.46 (m, 2 H), 3.81 (br. s., 2 H), 5.26 (t, J=5.1 Hz, 1 H).
[00103] 13C NMR (75 MHz, DMSO-d6) 6/ppm: 10.57 (s), 15.55 (s), 50.88 (t, J=3.5 Hz), 54.88 (s), 64.61 (br. t), 65.38 (br. t).
N-(2-hydroxyethyl)-N,N-dimethyl-N-propylammonium bis(trifluoromethanesulfonyl)amide [00104] In a 500 ml round bottom flask, solutions of 100 g (0.472 mol) of N-(2-hydroxyethyl)-N,N-dimethyl-N-propylammonium bromide in 100 ml MQ water and 135 g (0,472 mol) of LiTFSI in 100 ml MQ water were mixed under vigorous stirring. Phase separation occurred at once, but the stirring was continued overnight (16 hours) at room temperature. Then, 120 ml of CH2Cl2 were added and the phases separated.
The water phase was extracted with 20 ml of CH2Cl2 and the combined organic phases were washed 7 times with 80 ml of MO water. A
clear solution was obtained and poured into a round bottom flask. The solvent was removed first using at rotary evaporator and then under high vacuum at 60 C. In this manner, 154.67 g (80 `)/0) of pure N-(2-hydroxyethyl)-N,N-dimethyl-N-propylammonium bis(trifluoromethanesulfonyl)amide as a colourless liquid were obtained.
[00105] 1F1 NMR (300 MHz, DMSO-d6) 6/ppm: 0.89 (t, J=7.3 Hz, 3 H), 1.59 - 1.80 (m, 2 H), 3.05 (s, 6 H), 3.21 -3.32 (m. 2 H), 3.33 -3.40 (m, 2 H), 3.83 (br. s., 13 H), 5.26 (t, J=4.9 Hz, 6 H).
[00106] 13C NMR (75 MHz, DMSO-d6) 6/ppm: 10.38 (s), 15.51 (s), 50.87 (br. t), 55.02 (s), 64.82 (br. t), 65.65 (br.
t), 119.58 (q, J=321.8 Hz).
[00107] 19F NMR (470 MHz, DMSO-de) 6/ppm: -78.76 (s).
N-(2-trimethylsiloxyethyl)-N,N-dimethyl-N-propylammonium bis(trifluoromethanesulfonyl)amide [00108] To a 250 ml round bottom flask containing 154,6 g (0.38 mol) of neat N-(2-hydroxyethyl)-N,N-dimethyl-N-propylammonium bis(trifluoromethanesulfonyl)amide, 72,63g (0.45 nnol) of hexamethyldisilazane (HMDS) were added at room temperature as a gentle stream of nitrogen was passed through the apparatus to facilitate the removal of forming ammonia. The mixture was slowly heated to 60-70 C and stirred so that a fine emulsion of HMDS in IL formed. A vigorous evolution of gaseous ammonia started close to 60 C and ended after a few minutes, but the mixture was heated and stirred overnight (16 hours after the end of vigorous reaction). Then, the remaining HMDS, which was in separate layer on top of the desired product, was decanted. A slightly coloured oil was obtained and diluted with 150 ml of CH2Cl2. 10 g of activated charcoal were added and the mixture was heated to its boiling point for 3 minutes. The mixture was then cooled to room temperature and filtered after 1h through a 0.22 pm PTFE filter. The solvent was removed using a rotary evaporator. 5 ml of fresh HMDS were added to the clear product. The resulting mixture was vigorously stirred and heated to 70 C for one hour. Then, the volatile compounds were removed in vacuo and the flask was refilled 6 times with argon and again evacuated.
The product was heated to 70 C during this manipulation. Finally, the apparatus was cooled down under vacuum and refilled with argon. In this manner, 183 g (99 %) of the title compound in form of a colourless liquid were obtained.
(00109) 1H
NMR (300 MHz, CHLOROFORM-d) 6/ppm: 0.10 (s, 9 H), 0.95 (t, J=7.1 Hz, 3 H), 1.65 - 1.83 (m, 2 H), 3.08 (s, 6 H), 3.21 - 3.31 (m, 2 H), 3.40 (dt, J=4.5, 2.3 Hz, 2 H), 3.94 (br.
s., 2 H).
[00110] 13C NMR (75 MHz, CHLOROFORM-d) 6/ppm: -4.96 - 1.24 (m), 9.90 (br. s.), 15.95 (br. s.), 51.56 (br. s.), 56.49 (s), 64.90 (br. s.), 67.02 (br. s), 119.68 (q, J=321.2 Hz).
[00111] 19F NMR (470 MHz, CHLOROFORM-d) 6/ppm: -78.87 (s).

Example 6- N-(2-trimethylsiloxyethyl)-N-methylpyrrolidinium bis(trifluoromethanesulfony0 amide F F F

F N \\ A F

H3C\o, (N) H3C
N-(2-hydroxyethyl)-N-methylpyrrolidinium chloride (001121 In a 250 ml round bottom flask equipped with a magnetic stirrer were placed 30 g (0.352 mol) of N-methylpyrrolidine dissolved in 83 g of toluene. To this solution, a mixture of 28,3 g (0,352 mol) of 2-chloroethanol in 20 g of toluene was added dropwise over period of 0.5 h. The mixture was stirred over a weekend (57 h) during which no signs of completed reaction were observed. The mixture was thus heated to 80 C for 14 h during which phase separation occurred. The mixture was cooled to room temperature and the lower layer solidified.
Toluene was decanted and then, the solid was crushed and dissolved in methanol. 5 g of activated charcoal were added. The mixture was heated to its boiling point, cooled and filtered.
The filtrate was evaporated to obtain 43.34 g (75 %) of the title N-(2-hydroxyethyl)-N-methylpyrrolidinium chloride.
[00113] 1H NMR (300 MHz, DMSO-c16) 6/ppm: 1.93 - 2.17 (m, 4 H), 3.08 (s, 3 H), 3.47 (dd, J-.6.04, 4.21 Hz, 2 H), 3.52 - 3.62 (m, 4 H), 3.80 (dd, J=4.39, 2.20 Hz, 2 H), 5.72 (t, J=5.31 Hz, 1 H).
[00114] 13C NMR (75 MHz, DMS0-016) 6/ppm: 25.64 (s), 52.57 (br. s.), 60.17 (s), 68.93 (br. s.), 69.31 (br. s.).
N-(2-hydroxyethyl)-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)amide [00115] In a 250 ml round bottom flask, solutions of 38 g (0.23 mol) of N-(2-hydroxyethyl)-N-methylpyrrolidinium chloride in 130 ml MO water and 65 g (0,23 mol) of solid LiTFSI were mixed under vigorous stirring. Phase separation occurred at once, but the stirring was continued overnight (16 hours) at room temperature. Then, 80 ml of CH2Cl2 were added and the phases separated. The organic phase was washed 7 times with 80 ml of MO
water. A clear solution was obtained and poured into a round bottom flask. The solvent was removed first using a rotary evaporator and then under high vacuum at 65 C. In this manner, 67.46 g (70 %) of pure N-(2-hydroxyethyl)-N,N-dimethyl-N-propylammonium bis(trifluoromethanesulfonyDamide as a colourless liquid were obtained.
[00116] 1H NMR (300 MHz, DMSO-d6) 6/ppm: 1.96 - 2.21 (m, 4 H), 3.03 (s, 3 H), 3.42 (dd, J=5.86, 4.39 Hz, 2 H), 3.46 - 3.59 (m, 4 H), 3.76 - 3.92 (m, 2 H), 5.27 (t, J=4.76 Hz, 1 H).
[00117] 13C NMR (75 MHz, DMSO-d6) 6/ppm: 20.89 (s), 47.98 (t, J=3.50 Hz), 55.59 (s), 64.31 (t, J=2.80 Hz), 64.66 (t, J=2.80 Hz), 119.54 (q, J=322.00 Hz).

N-(2-trimethylsiloxyethyl)-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)amide [00118] To a 250 ml round bottom flask containing 67,46 g (0.164 mol) of neat N-(2-hydroxyethyl)-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)amide, 27 g (0.168 mol) of hexamethyldisilazane (HM DS) were added at room temperature as a gentle stream of nitrogen was passed through the apparatus to facilitate removal of forming ammonia. The mixture was slowly heated to 60-70 C and stirred so that a fine emulsion of HMDS in IL formed. A vigorous evolution of gaseous ammonia started close to 60 C and ended after a few minutes. The mixture was heated and stirred overnight (16 hours after the end of vigorous reaction). Then, the volatile compounds were removed in vacuo and the flask was refilled 6 times with Ar and again evacuated. The product was heated to 70 C during this manipulation. Finally, the apparatus was cooled down under vacuum and refilled with argon. In this manner, 81 g (100 /0) of the title compound in form of a colourless liquid, which solidified at room temperature, were obtained.
[00119] 1H NMR (300 MHz, CHLOROFORM-d) 6/ppm: 0.07 (s, 9 H), 2.01 - 2.26 (m, 4 H), 3.02 (s, 3 H), 3.32 -3.43 (m, 2 H), 3.44 - 3.62 (m, 4 H), 3.84 - 4.00 (m, 2 H).
[00120] 13C NMR (75 MHz, CHLOROFORM-d) 6/ppm: -1.35 (s), 20.96 (s), 48.29 (br.
s.), 56.65 (s), 65.11 (br. s.), 65.35 (br. s), 119.57 (q, J=323.70 Hz).
[00121] 19F NMR (470 MHz, CHLOROFORM-d) 6/ppm: -79.21 (s) Example 7- 1-(2-trimethylsiloxyethyl)-2,3-dimethylimidazolium bis(trifluoromethanesulfonyl) amide F-\ O
s' 0 F
C) \ - II

II

H3C-..._NN+---N....,0 ,CH3 \-I NSi / \

1-(2-hydroxyethyl)-2,3-dimethylimidazolium chloride [00122] In a 250 ml round bottom flask equipped with a magnetic stirrer were placed 48,07 g (0.5 mol) of 1,2-dimethylimidazole dissolved in 80 ml of toluene. To this solution, 40.26 g (0,5 mol) of 2-chloroethanol were added in one portion. The mixture was stirred over a weekend (57 h) at 70 C during which no sign of completed reaction were observed. The mixture was heated to reflux for 24 h during which phase separation occurred. The mixture was cooled to room temperature and the lower yellow oily layer solidified. The toluene was decanted and then the solid was crushed, washed with fresh toluene and filtered. Product was dried to obtain 87.25 g (98 /0) of the title 1-(2-hydroxyethyl)-2,3-dimethylimidazolium chloride.

[00123] 1H NMR (300 MHz, DMSO-d6) 6/ppm: 2.63 (s, 3 H), 3.64 (q, J=5.13 Hz, 2 H), 3.79 (s, 3 H), 4.23 (t, J=4.94 Hz, 2 H), 5.59 (t, J=5.68 Hz, 1 H), 7.69 - 7.79 (m, 2 H).
[00124] 13C NMR (75 MHz, DMSO-d6) 6/ppm: 9.78 (s), 34.72 (s), 50.22 (s), 59.60 (s), 121.23 (s), 122.13 (s), 144.86 (s).
1-(2-hydroxyethyl)-2,3-dimethylimidazolium bis(trifluoromethanesulfonyl)amide [00125] In a 250 ml round bottom flask, a solution of 20 g (0.113 mol) of N-(2-hydrogethyl)-N-methylpyrrolidinium chloride in 130 ml MO water and 36 g (0,125 mol) of solid LiTFSI were mixed under vigorous stirring. Phase separation occurred at once, but the stirring was continued overnight (16 hours) at room temperature. Then, 80 ml of CH2Cl2 were added and the phases separated. The organic phase was washed 4 times with 50 ml of MO water. A clear solution was obtained and poured into a round bottom flask. The solvent was removed first using a rotary evaporator and then under high vacuum at 65 C. In this manner, 23.2 g (49 /0) of 1-(2-hydroxyethyl)-2,3-dimethylimidazolium bis(trifluoromethanesulfonyl)amide as a colourless liquid were obtained.
[00126] 1H NMR (300 MHz, DMSO-d6) 6/ppm: 2.59 (s, 3 H), 3.64 - 3.74 (m, 2 H), 3.76 (s, 3 H), 4.18 (t, J=4.70 Hz, 2 H), 5.11 (br. s, 1 H), 7.59 (s, 2 H).
[00127] 13C NMR (75 MHz, DMSO-d6) 6/ppm: 9.48 (s), 34.71 (s), 50.38 (s), 59.76 (s), 119.63 (q, J=321.70 Hz), 121.36 (s), 122.26 (s), 144.95 (s).
1-(2-trimethylsiloxyethyl)-2,3-dimethylimidazolium bis(trifluoromethanesulfonyl)amide [00128] To a 50 ml round bottom flask, 8.42 g (0.02 mol) of neat 1-(2-hydroxyethyI)-2,3-climethylimidazolium bis(trifluoromethanesulfonyl)amide and 3,42 g (0.02 mol) of hexamethyldisilazane (HMDS) were added at room temperature, as gentle stream of nitrogen was passed through the apparatus to facilitate the removal of forming ammonia. The mixture was slowly heated to 60-70 C and stirred so that a fine emulsion of HMDS in IL formed.
A vigorous evolution of gaseous ammonia started close to 80 C and ended after a few minutes. The mixture was stirred for 4 hours at 80 C and overnight at room temperature (16 hours after the end of vigorous reaction).
Then, the volatile compounds were removed in vacuo. The flask was refilled 6 times with argon and again evacuated. The product was heated to 70 C during this manipulation. Finally, the apparatus was cooled down under vacuum and refilled with argon. In this manner, 9.8 g (100 /0) of the title compound in form of a colourless liquid were obtained.
[00129] 1H NMR (300 MHz, CHLOROFORM-d) 6/ppm: 0.00 (s, 9 H), 2.55 (s, 3 H), 3.75 (s, 3 H), 3.82 (t, J=4.70 Hz, 2 H), 4.15 (t, J=4.70 Hz, 3 H), 7.18 (m, J=2.20 Hz, 1 H), 7.24 (m, J=1.80 Hz, 1 H) [00130] "C NMR (75 MHz, CHLOROFORM-d) 6/ppm: -2.61 - 0.00 (m), 9.56 (s), 35.01 (s), 50.67 (s), 60.70 (s), 119.58 (q, J=321.70 Hz), 121.22 (s), 122.13 (s), 144.50 (s).
[00131] 19F NMR (470 MHz, CHLOROFORM-d) Cippm: -79.19 (s) Example 8- 1-(2-trimethylsiloxyethyl)-3-methylimidazolium chloride CI
H3C-_,N7N+.-- /
\___ Ho C 3 \ _ / NS i / Nrsu H3C l-/ 1 13 1-(2-hydroxyethyl)-3-methylimidazolium chloride [00132] In a 250 ml round bottom flask equipped with a magnetic stirrer were placed 30.3 g (0.37 mol) of 1-methylimidazole dissolved in 50 ml of MeCN. To this solution, 35 g (0,435 mol) of 2-chloroethanol were added in one portion. The mixture was stirred refluxed for 48 hours during which no sign of completed phase separation occurred. The mixture was the cooled to room temperature and small part of it (5 ml) was mixed with 30 ml ethyl acetate. A yellow oil separated, was washed with fresh ethyl acetate and dried under vacuum. Upon standing, it solidified into a crystalline solid, which was identified as 1-(2-hydroxyethyl)-3-methylimidazolium chloride.
[00133] 1H NMR (300 MHz, DMSO-d6) 6/ppm: 3.68 (t, J=4.94 Hz, 2 H), 3.87 (s, 3 H), 4.25 (t, J=4.94 Hz, 2 H), 5.60 (br. s., 1 H), 7.79 - 7.84 (m, 1 H), 7.85 (t, J=1.65 Hz, 1 H), 9.41 (s, 1 H).
[00134] 130 NMR (75 MHz, DMSO-d6) 6/ppm: 35.71 (s), 51.49 (s), 59.29 (s), 122.66 (s), 123.26 (s), 136.90 (s).
1-(2-trimethylsiloxyethyl)-3-methylimidazolium chloride [00135] The remaining of the reaction mixture of the above step a) was mixed with 53 ml of HMDS at room temperature and brought to reflux under a N2 purge. At the beginning, two layers formed, but after about 30 minutes, they became miscible and blended together. After 24 hours, the volatile compounds were removed using a rotary evaporator and a high vacuum. 80 g (98%) of a very viscous yellow oil were obtained.
[00136] 1H NMR (300 MHz, CHLOROFORM-d) 6/ppm: -0.15 (s, 9 H), 3.68 - 3.79 (m, 2 H), 3.91 (s, 3 H), 4.23 -4.38 (m, 2 H), 7.37 (t, J=1.65 Hz, 1 H), 7.60 (t, J=1.65 Hz, 1 H), 10.13 (s, 1 H) [00137] 130 NMR (75 MHz, CHLOROFORM-d) 6/ppm: -1.19 (s), 36.07 (s), 51.49 (s), 60.74 (s), 122.59 (s), 122.89(s), 137.11 (s).
Example 9 - Cyclic Voltametry (CV) of N-(2-trimethylsiloxyethyl)-N,N,N-trimethylammonium bis(trifluoro-methanesulfonyl)amide (N1112-0TMS-TFSI) [00138] The compound prepared in Example 1 was charged into an electrochemical cell. This was a three electrodes cell having a Pt wire as a working electrode, lithium metal (as a sheet) as a counter electrode and another sheet of lithium metal as a reference electrode. The CV curve was measured between 0-6 V vs. Li at rate of 1mV/s (Fig.1). On the oxidation side, the stability of this IL reaches 5,4V.

Example 10- Cyclic Voltametry (CV) of N-ethyl-N-(2-trimethylsiloxyethyl)-N,N-dimethylammonium bis(trifluorome thanesulfonyl)amide (N1122-0TMS-TFSI) [00139] The compound prepared in Example 2 was charged into an electrochemical cell. This was a three electrodes cell having a Pt wire as a working electrode, lithium metal (as a sheet) as a counter electrode and another sheet of lithium metal as a reference electrode. The CV curve was measured between 0-6 V vs. Li at rate of 1mV/s (Fig.2). A good stability was found with this IL with oxidation wall starting at 5.5V and quite good stability in the reduction side until OV.
Example 11 - Cyclic Voltamehy (CV) of 0.3 M LiTFSI in N-ethyl-N-(2-trimethylsiloxyethyl)-N,N-dimethylammonium bis(trifluoromethanesulfonyl)amide (N1122-0TMS-TFSI) [00140] A 0.3 molar solution of LiTFSI was prepared by mixing 1.7225 g LiTFSI
in 20 ml of IL of Example 2. This solution was charged into an electrochemical cell. This was a three electrodes cell having a Pt wire as a working electrode, lithium metal (as a sheet) as a counter electrode and another sheet of lithium metal as a reference electrode. The CV curve was measured between 0-6 V vs. Li at rate of 1mV/s (Fig. 3). The electrolyte was found to be stable in the voltage window of 0-5.4 V.
Example 12- Compatibility of electrolyte with L1FePO4 electrode [00141] The electrolyte prepared in Example 11 was tested in a three-electrode electrochemical cell with a L1FePO4 (LFP) electrode. The cathode material was prepared using a mixture of LiFePO4, carbon black and polyvinylidene fluoride (PVDF) in a ratio 84:3:3:10% by weight in N-methylpyrrolidone (NMP). This mixture was then coated on an aluminum current collector. The electrode material was dried at 120 C in a vacuum oven for 12 h before use. Two pieces of Li metal sheets were used as reference electrode and counter-electrode. The working electrode based on LiFePO4 was cycled between 2-4 V versus Li, at current rate C/24 (Fig. 4). The result shows that this electrolyte is suitable for use with the LFP electrode. The reversible capacity was found at 166mAhig in the third cycle of the formation.
Example 13- Compatibility of electrolyte with L1N1112Mn3/204 electrode [00142] The electrolyte prepared in Example 11 was tested in a three-electrode electrochemical cell with a LiNi112Mn3/204 electrode. The cathode material was prepared using a mixture of LiNi112Mn3/204, carbon black and polyvinylidene fluoride (PVDF) in a ratio 84:3:3:10% by weight in NMP. The mixture was then coated on an aluminum current collector. The electrode material was dried at 120 C in a vacuum oven for 12 h before use.
Two pieces of Li metal sheets were used as reference electrode and counter-electrode. L1Ni112Mn3/204, as the working electrode, was cycled between 3-4.9 V versus Li, at current rate C/24.
The result shows only half of theoretical capacity with very high hysteresis of charge/discharge and the plateau potential could not be observed.

Example 14 - Compatibility of electrolyte with graphite electrode [00143] The electrolyte prepared in Example 11 was tested in a three-electrode electrochemical cell with graphite (OMAC, Osaka Japan) electrode. The negative electrode was prepared by mixing the graphite, carbon black and PVDF in a ratio 92:2:6 % by weight in NMP and then coating the mixture on a copper current collector. The electrode material was dried at 120 C in a vacuum oven for 12 h before use.
Two pieces of Li metal sheets were used as reference electrode and counter-electrode versus Li. The graphite working electrode was cycled between 0-2 V vs. Li at current rate C/24 (Fig. 5). The result shows a compatibility of this ionic liquid with graphite with a coulombic efficiency in the first cycle of 83% and a reversible capacity of 290mAh/g.
Example 15 - Cyclic Voltametry (CV) of N-(2-trimethylsiloxyethyl)-N,N-dimethyl-N-propylammonium bis(trifluoromethanesulfonyl)amide (N1132-0TMS-TFSI) [00144] The compound prepared in Example 5 was charged into a electrochemical cell. This was a three electrodes cell having a Pt wire as a working electrode, lithium metal (as a sheet) as a counter electrode and another sheet of lithium metal as a reference electrode. The CV curve was measured between 0-6 V vs. Li at rate of 1mV/s (Fig.6). The limit stability was found with this IL, with an oxidation wall starting at 5.0V and quite good stability in the reduction side until OV. Cathodes having lower oxidation voltages than 5V can be used with this IL.
Example 16- Cyclic Voltametry (CV) of 0.3 M LITFSI in N-(2-trimethylsiloxyethyl)-N,N-dimethyl-N-propylammonium bis(trifluoromethanesulfonyl)amide (N1132-0TMS-TFSI) [00145] A 0.3 molar solution of LiTFSI in the IL of Example 5 was prepared by mixing 1.7225 g LiTFSI in 20 ml of the IL. This electrolyte was charged into an electrochemical cell. This was a three electrodes cell having a Pt wire as a working electrode, lithium metal (as a sheet) as a counter electrode and another sheet of lithium metal as a reference electrode. The CV curve was measured between 0-6 V vs. Li at rate of 1mV/s (Fig. 7).
Example 17- Compatibility of electrolyte with active LiFePO4 electrode [00146] The electrolyte prepared in Example 16 was tested in a three-electrode electrochemical cell with a LiFePO4, electrode. The cathode material was prepared as described in Example 12. Two pieces of Li metal sheets were used as reference electrode and counter electrode. The LiFePat as working electrode was cycled between 2-4 V versus Li, graphite between 2 and 4V vs. Li at current rate C/24 (Fig. 8). The result shows a reversible capacity of 113mAh/g with this electrolyte.
Example 18- Compatibility of electrolyte with active LiNiv2Mn3/204 electrode [00147] The electrolyte prepared in Example 16 was tested in a three-electrode electrochemical cell with a LiNiv2Mn3/204 electrode. The cathode material was prepared as described in the Example 13. Two pieces of Li metal sheets were used as reference electrode and counter electrode. The working electrode, LiNi112Mn3/204, was cycled between 3-4.9 V versus Li at current rate C/24. A capacity of 70mAh/g was obtained with a high voltage cathode.
Example 19- Compatibility of electrolyte with active graphite electrode [00148] The electrolyte prepared in Example 16 was tested in a three-electrode electrochemical cell with a graphite electrode. The anode materials was prepared as described in Example 14. Two pieces of Li metal sheets were used as reference electrode and counter electrode and graphite was used as working electrode. The cell was cycled between 0-2.5V versus Li at current rate C/24. A reversible capacity of 30mAh/g was obtained.
Example 20 - Cyclic Voltametry (CV) of N,N,N-triethyl-N-(2-trimethylsiloxyethyl)ammonium bis(trifluoromethanesulfonyl)amide (N2222-0TM-TFSI) [00149] The compound prepared in Example 4 was charged into a electrochemical cell. This was a three electrodes cell having a Pt wire as a working electrode, lithium metal (as a sheet) as a counter electrode and another sheet of lithium metal as a reference electrode. The CV curve was measured between 0-6 V vs. Li at rate of 1mV/s (Fig. 9). This electrolyte is stable at high voltage (5.4V).
Example 21 - Cyclic Voltametry (CV) of 0.3 M LiTFSI in N,N,N-triethyl-N-(2-trimethylsiloxyethyl)ammonium bis(trifluoromethanesulfonyl)amide [00150] A 0.3 molar solution of LiTFSI in the IL prepared in Example 4 was prepared by mixing 1.7225 g LiTFSI
in 20 ml of the IL. This solution was charged into an electrochemical cell.
This was a three electrodes cell having a Pt wire as a working electrode, lithium metal (as a sheet) as a counter electrode and another sheet of lithium metal as a reference electrode. The CV curve was measured between 0-6 V vs. Li at rate of 1mV/s (Fig. 10).
This electrolyte is stable at high voltage.
Example 22- Compatibility of electrolyte with active electrodes [00151] The electrolyte prepared in Example 21 was tested in a three-electrode electrochemical cell. The anode material was prepared as described in Example 14. Two pieces of Li metal sheets were used as reference electrode and graphite was used as the working electrode. The cell was cycled between 0-2.5V versus Li at current rate C/24. 160mAh/g of reversible capacity was obtained in the 3rd cycle.
Example 23 - Cyclic Voltametry (CV) of N,N-diethyl-N-(2-trimethylsiloxyethyl)-N-methylammonium bis(trifluoromethanesulfonyl)amide (N1222-0TMS-TFSI) [00152] The compound prepared in Example 3 was charged into an electrochemical cell. This was a three electrodes cell having a Pt wire as a working electrode, lithium metal (as a sheet) as a counter electrode and another sheet of lithium metal as a reference electrode. The CV curve was measured between 0-6 V vs. Li at rate of 1mV/s (Fig. 11). A quite acceptable stability until 5.2V during oxidation was obtained.

Example 24- Cyclic Voltametry (CV) of a3 M LiTFSI in N,N-diethyl-N-(2-trimethylsiloxyethyl)-N-methylammonium bis(trifluoromethanesulfonyl)amide (N1222-0TM-TFSI + 0.3M
LiTFSI) [00153] A 0.3 molar solution of LiTFSI in the IL prepared in Example 3 was prepared by mixing 1.7225 g LiTFSI
in 20 ml of the IL and charged into an electrochemical cell. This was a three electrodes cell having a Pt wire as a working electrode, lithium metal (as a sheet) as a counter electrode and another sheet of lithium metal as a reference electrode. The CV curve was measured between 0-6 V vs. Li at rate of 1mV/s (Fig. 12). The same behaviour as in Example 23 was obtained after salt addition. A quite acceptable stability until 5.2V during oxidation was obtained.
Example 25- Compatibility of electrolyte with graphite [00154] The electrolyte prepared in Example 24 was tested in a three-electrode electrochemical cell with a graphite electrode. The anode material was prepared as described in Example 14. Two pieces of Li metal sheets were used as reference electrode and counter electrode and graphite was used as working electrode. The cell was cycled between 0-2.5V versus Li at current rate C/24 (Fig. 13). The lithium intercalation in the graphite was successful with a low coulombic efficiency in the first cycle and increasing in the subsequent cycles up to 84%
after 6 cycles at C/24 with a reversible capacity of 192mAh/g.
Example 26- Compatibility of electrolyte with SiOx [00155] The electrolyte prepared in Example 11 was tested in a three-electrode electrochemical cell with a SiOx electrode. The negative electrode was prepared by mixing the SiOx powder, carbon black and alginate in a ratio 83:2:15 % by weight in NMP and then coating this mixture on a copper current collector. The electrode material was dried at 150 C in a vacuum oven for 12 h before use. Two pieces of Li metal sheets were used as reference and counter electrode and graphite was used as working electrode. The cell was cycled between 0.05-2.5V
versus Li at current rate C/24 and 60 C (Fig. 14). The lithium insertion in the SiOx material was successful with good coulombic efficiency in the first cycle (99%) at C/24 and with reversible capacity of 520mAh/g.
Example 27- Determination of viscosities [00156] The viscosity of the ionic compounds or ionic liquids was determined using an Anton Paar Physica MCR301 instrument using PP5O-SN5204 measuring equipment. At high temperature, a comparable viscosity was obtained for all the ionic liquids (Fig. 15). The viscosity increased in the following order: N1122, N1112, N1132, N1222, N2222.
Example 28- Determination of conductivities [00157] The conductivity of the ionic compounds or ionic liquids was measured between room temperature and 90 C using a MMulty Conductimeter made by Materials Mates Italia S.r.L. The conductivity measurements show conductivity of the different ionic compound or ionic liquid in the following order (Fig. 16): N1122 > N1112 >

N2222 > N1222 > N1132. At 24 C, the highest value was 1.38x10-3 (N1122) and lowest value was 1.05x10-3 (N1132). At 60 C, the highest value was 4.41x10-3 (N1122) and lowest value was 3.83x10-3 (N1132).
[00158] The scope of the claims should not be limited by the preferred embodiments set forth in the examples, but should be given the broadest interpretation consistent with the description as a whole. =

, REFERENCES
[00159] The present description refers to a number of documents, the content of which is herein incorporated by reference in their entirety. These documents include, but are not limited to, the following:
= US 6365301, = US 6365068, = US 2008/0266642, = WO 2009/013046, = US 2009/0045373, = Wasserscheid, P. and T. Welton, Eds. (2008). Ionic liquids in synthesis Weinheim, Wiley-VCH, pp. 148-155, = Ue, M.; Murakami, A.; Omata, K.; Nakamura, S., On the Anodic Stability of Organic Liquid Electrolytes.
Book of Abstracts of 41st Battery Symposium in Japan 2000, 292-293.
= N. Koura, et al. Chem Lett, 12 (2001), pp. 1320-1321 and Abs. 360, IMLB
meeting, The Electrochemical Society, Inc: Nara, Japan; 2004 = Holzapfel et al. Chem Commun, 4 (2004), pp. 2098-2099 and Carbon, 43 (2005), pp. 1488-1498, = Journal of Power Sources 162 (2006) 658-662] using 1-ethyl-3-methylimidazolium (EM1m)-FSI and EM1m-TFSIc, = Journal of Power Sources 175 (2008) 866-873, = Matsumoto, Japan battery symposia book of abstracts 2011, = Zhang, Z.; Dong, J.; West, R.; Amine, K., Oligo(ethylene glycol)-functionalized disiloxanes as electrolytes for lithium-ion batteries. Journal of Power Sources 2010, 195 (18), 6062-6068, = Lukevics, E.; Liberts, L.; Voronkov, M. G., Organosilicon Derivatives of Aminoalcohols. Russian Chemical Reviews 1970, 39(11), 953-963, and = JP 2010-095473A.

Claims (22)

CLAIMS:
1. An ionic compound having attached thereto a silyloxy group.
2. An ionic liquid having attached thereto a silyloxy group.
3. The ionic compound or ionic liquid of claim 1 or 2 being of formula (I):
wherein:
CAT+ is a cation containing positively charged atom which is nitrogen, phosphorus or sulfur;
R, R1 and R2 are independently C1-C8 alkyl, alkenyl or alkynyl groups, preferably C1-C8 alkyl groups, preferably C1-C4 alkyl and alkenyl groups, and most preferably C1-C2 alkyl groups;
L represents a bond or a linker, and ANI- represents a single charged anion.
4. The ionic compound or ionic liquid of claim 3, wherein L is a C1-C12 alkylene, alkenylene, or alkynylene group, optionally comprising one or more ether function, and optionally substituted with one or more halogen atoms.
5. The ionic compound or ionic liquid of claim 4, wherein L is a C1-C12 alkylene group.
6. The ionic compound or ionic liquid of claim 5, wherein L is a C2-C6 alkylene group.
7. The ionic compound or ionic liquid of claim 6, wherein L is a C2-C4 alkylene group.
8. The ionic compound or ionic liquid of claim 7, wherein L is -CH2-CH2-.
9. The ionic compound or ionic liquid of any one of claims 1 to 8, wherein the cation of the ionic compound or ionic liquid is of formula (11a), (11b) or (11c):
wherein R3, R4 and R5 are independently C1-C16 alkyl, alkenyl, or alkynyl groups, preferably C1-C8 alkyl or alkenyl groups, and most preferably C1-C4 alkyl groups.
10. The ionic compound or ionic liquid of any one of claims 1 to 8, wherein the cation of the ionic compound or ionic liquid is of formula (IIIa) (IIIb) or (IIIc):

wherein R6 is a C1-C16 alkyl, alkenyl, or alkynyl group, preferably a C1-C8 alkyl or alkenyl group, and most preferably a C1-C4 alkyl group; and X is a combination of one or more of ¨CH2¨, ¨O¨, and ¨N(CH3)-- so that CAT+ is a cation of the azetidinium, pyrrolidonium, piperidinium, azepanium, morpholinium, isomorpholinium or piperazinium type.
The ionic compound or ionic liquid of any one of claims 1 to 8, wherein the cation of the ionic compound or ionic liquid is of formula (IV):
wherein Z is a combination of one or more of ¨CH2¨, ¨CH=, ¨O¨, ¨N(alkyl)¨ and ¨N= so that CAT+ is a cation of the azetinium, 3,4-dihydro-2H-pyrolium, pyridinium, azepinium, pyrimidinium, piperazinium, imidazolium, or pyrazolium type.
The ionic compound or ionic liquid of any one of claims 1 to 11, wherein the anion of the ionic compound or ionic liquid is perchlorate, hexafluorophosphate, tris(pentafluoroethyl)trifluorophosphate, tetrafluoroborate, trifluoromethyltrifluoroborate, pentafluoroethyltrifluoroborate, heptafluoropropyltrifluoroborate, nonafluorobutyltrifluoroborate, trifluoromethanesulfonate, trifluoroacetate, bis(fluorosulfonyl)amide, bis(trifluoromethanesulfonyl)amide, bis(pentafluoroethylsulfonyl)amide, bis(heptafluoropropylsulfonyl)amide, bis(nonafluorobutylsulfonyl)amide, N-trifluoroacetyl-fluorosulfonylamide, N-trifluoroacetyl-trifluoromethanesulfonylamide, N-trifluoroacetyl- pentafluoroethylsulfonyl amide, N-trifluoroacetyl-heptafluoropropylsulfonylamide, N-trifluoroacetyl-nonafluorobutylsulfonylamide, N-fluorosulfonyl-trifluoromethanesulfonylamide, N-fluorosulfonyl- pentafluoroethylsulfonyl amide, N-fluorosulfonyl-heptafluoropropylsulfonylamide, N-fluorosulfonyl-nonafluorobutylsulfonylamide, N-trifluoromethanesulfonyl-pentafluoroethylsulfonyl amide, N-trifluoromethanesulfonyl-heptafluoropropylsulfonylamide or N-trifluoromethanesulfonyl-nonafluorobutylsulfonylamide.
The ionic compound or ionic liquid of claim 12, wherein the anion of the ionic compound or ionic liquid is bis(fluorosulfonyl)amide, bis(trifluoromethanesulfonyl)amide, or N-fluorosulfonyl-trifluoromethane-sulfonylamide The ionic compound or ionic liquid of claim 13, wherein the anion of the ionic compound or ionic liquid is bis(trifluoromethanesulfonyl)amide.
32
15. An electrolyte comprising at least one ionic compound or ionic liquid as defined in any one of claims 1 to 14 and a conducting salt.
16. The electrolyte of claim 15 further comprising an organic solvent.
17. The electrolyte of claim 16, wherein the organic solvent is a polar organic solvent.
18. The electrolyte of any one of claims 15 to 17, further comprising an unsaturated carbonate.
19. An electrochemical cell comprising an anode, a cathode, and an electrolyte as defined in any one of claims 15 to 18.
20. The electrochemical cell of claim 19 being part of a battery.
21. The electrochemical cell of claim 19 being part of a capacitor.
22. The electrochemical cell of claim 19 being part of an electrochromic device.
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