WO2001017904A1 - MIXTURES WITH LiPF¿6? - Google Patents

MIXTURES WITH LiPF¿6? Download PDF

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Publication number
WO2001017904A1
WO2001017904A1 PCT/EP2000/008438 EP0008438W WO0117904A1 WO 2001017904 A1 WO2001017904 A1 WO 2001017904A1 EP 0008438 W EP0008438 W EP 0008438W WO 0117904 A1 WO0117904 A1 WO 0117904A1
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alkyl
lipf
mixtures
mixture
alkylene
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PCT/EP2000/008438
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German (de)
French (fr)
Inventor
Olaf BÖSE
Matthias Rieland
Dirk Seffer
Wolfgang Kalbreyer
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Solvay Fluor Und Derivate Gmbh
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Priority to AU70008/00A priority Critical patent/AU7000800A/en
Publication of WO2001017904A1 publication Critical patent/WO2001017904A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0568—Liquid materials characterised by the solutes
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D15/00—Lithium compounds
    • C01D15/005—Lithium hexafluorophosphate
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C233/00—Carboxylic acid amides
    • C07C233/01—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms
    • C07C233/02—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms having nitrogen atoms of carboxamide groups bound to hydrogen atoms or to carbon atoms of unsubstituted hydrocarbon radicals
    • C07C233/04—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms having nitrogen atoms of carboxamide groups bound to hydrogen atoms or to carbon atoms of unsubstituted hydrocarbon radicals with carbon atoms of carboxamide groups bound to acyclic carbon atoms of an acyclic saturated carbon skeleton
    • C07C233/05—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms having nitrogen atoms of carboxamide groups bound to hydrogen atoms or to carbon atoms of unsubstituted hydrocarbon radicals with carbon atoms of carboxamide groups bound to acyclic carbon atoms of an acyclic saturated carbon skeleton having the nitrogen atoms of the carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms
    • 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
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0569—Liquid materials characterised by the solvents
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the invention relates to mixtures of LiPF 6 with certain acid amides and their use in electrolytes for batteries.
  • a large number of conductive salts and a large number of different organic solvents are known as the electrolyte solution for water-free batteries, see for example J. Electrochem. Soc. Vol. 141 (1994), pages 2989 to 2996.
  • Alkyl carbonates or alkylene carbonates are used particularly frequently, see EP-A-0 643 433.
  • the use of pyrocarbonates is also known, see US Pat. No. 5,427,874.
  • Alkyl acetates, N, N-disubstituted acetamides, sulfoxides, nitriles, glycol ethers or ethers can also be used, see EP-A-0 662 729. Mixtures of such solvents are also useful, for example also mixtures with dioxolane, see EP-A-0 385 724th
  • the object of the present invention is to provide stabilized mixtures with lithium hexafluorophosphate. This object is achieved by the present invention.
  • the mixtures according to the invention comprise LiPF 6 and at least one compound having the formula (I) R 1 C (0) NR 2 R 3 .
  • R 1 is CF 3 or R 4 CF 2 ;
  • R 2 , R 3 and R 4 are the same or different and stand for linear or branched C1-C3-alkyl.
  • R 2 , R 3 and R 4 can also represent linear or branched C1-C3 alkyl which is substituted by at least 1 halogen atom, preferably at least 1 fluorine atom.
  • the mixtures consist of LiPF 6 and at least one of the compounds of the formula (I) mentioned.
  • the compound or the compounds of formula (I) then act as a solvent and at the same time bring about stabilization of the solution.
  • the LiPF 6 is advantageously present in a concentration of at least 0.5 mol / l of the mixture if this mixture is to be used directly as an electrolyte. It is of course possible to provide smaller concentrations of lithium hexafluorophosphate - then the conductivity is correspondingly lower.
  • the upper limit in this case is the saturation concentration of LiPF 6 in the acetamide used.
  • mixtures with LiPF 6 concentrations of about 0.8 to 1.2 mol / 1 have optimal conductivity.
  • the concentration can also exceed the saturation limit.
  • dissolved LiPF 6 there is also solid LiPFg.
  • the solid / liquid mixture mentioned is then to be regarded as an intermediate stage for the production of electrolyte solutions.
  • Another embodiment contains LiPF 6 , at least one amide of the formula (I) and at least one further dipolar aprotic solvent known per se.
  • Preferred further solvents are selected from the group comprising dialkyl carbonate and alkylene carbonate, where alkyl is preferably C1-C3-alkyl and alkylene for ethylene and propylene.
  • alkyl is preferably C1-C3-alkyl and alkylene for ethylene and propylene.
  • dipolar aprotic solvents for example lactones, nitriles, formamides, acetamides, pyrolidinones, oxazolidinones, imidazolidinones, nitroalkanes, N, N-substituted urethanes, sulfolanes, dialkyl sulfoxides and sulfites and trialkyl phosphates.
  • the alkyl derivatives or di- or trialkyl derivatives with C1-C3-alkyl are preferred.
  • the amide of the formula (I) is then contained in such mixtures at least in an amount which has a stabilizing effect on the LiPF 6 .
  • Such mixtures preferably contain 0.5 mol / 1 LiPF 6 up to the saturation limit, 0.1 to 99.9% by volume of at least one compound of the formula (I) and 99.1 to 0.1% by volume of the or of other aprotic dipolar solvents.
  • LiPFg can also be contained in these mixtures beyond the saturation limit. This presupposes that further solvent is added before use as an electrolyte until the LiPF 6 has completely dissolved.
  • Another object of the present invention is the use of the mixtures according to the invention as an electrolyte in water-free batteries and Li-ion batteries with the mixtures according to the invention as an electrolyte.
  • the advantage of the mixtures according to the invention is that they have a stabilizing effect on the LiPFg. It has been found that the mixtures according to the invention can be heated to, for example, 90 ° C. without decomposition products being observed (for example in the 19 F-NMR spectrum or in the 31 P-NMR spectrum). The present examples are intended to explain the invention further without restricting its scope.
  • LiPF 6 LiPF 6

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Electrochemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Physics & Mathematics (AREA)
  • Secondary Cells (AREA)

Abstract

Lithium hexafluorophosphate is used as a conducting salt in electrolytes, e.g. batteries. Dipolar aprotic compounds such as alkyl carbonates, lactones, nitriles, formamides, sulfoxides or phosphates are used as solvents. It has now been discovered that dialkylamides of fluorinated carboxylic acids, especially trifluoro acetic acid, when used as a single solvent or in mixtures with other solvents which are known per se for this purpose, have a stabilizing effect on lithium hexaflurophosphate.

Description

Gemische mit LiPF6 Mixtures with LiPF 6
Beschreibungdescription
Die Erfindung bezieht sich auf Gemische von LiPF6 mit bestimmten Säureamiden und ihre Verwendung in Elektrolyten für Batterien.The invention relates to mixtures of LiPF 6 with certain acid amides and their use in electrolytes for batteries.
Als Elektrolytlösung für wasserfreie Batterien sind eine Vielzahl von Leitsalzen und eine Vielzahl unterschiedlicher organischer Lösungsmittel bekannt, siehe beispielsweise J. Electrochem. Soc . Vol. 141 (1994), Seiten 2989 bis 2996. Besonders häufig werden Alkylcarbonate oder Alkylencarbonate eingesetzt, siehe EP-A-0 643 433. Bekannt ist auch die Verwendung von Pyrocarbonaten, siehe US-A 5,427,874. Brauchbar sind auch Alkylacetate, N,N-disubstituierte Acetamide, Sulf- oxide, Nitrile, Glykolether oder Ether, siehe EP-A-0 662 729. Auch Gemische solcher Lösemittel sind brauchbar beispielsweise auch Gemische mit Dioxolan, siehe EP-A-0 385 724.A large number of conductive salts and a large number of different organic solvents are known as the electrolyte solution for water-free batteries, see for example J. Electrochem. Soc. Vol. 141 (1994), pages 2989 to 2996. Alkyl carbonates or alkylene carbonates are used particularly frequently, see EP-A-0 643 433. The use of pyrocarbonates is also known, see US Pat. No. 5,427,874. Alkyl acetates, N, N-disubstituted acetamides, sulfoxides, nitriles, glycol ethers or ethers can also be used, see EP-A-0 662 729. Mixtures of such solvents are also useful, for example also mixtures with dioxolane, see EP-A-0 385 724th
Auch 1, 2-Dis- (trifluoracetoxy) ethan und N,N-Dimethyltri- fluoracetamid sind als Lösungsmittel für Lithi m-bis- (tri- fluormethansulfonyl) imid eingesetzt worden, siehe ITE Battery Letters Vol. 1 (1999), Seiten 105 bis 109.1, 2-Dis- (trifluoroacetoxy) ethane and N, N-dimethyltrifluoroacetamide have also been used as solvents for lithi m-bis- (trifluoromethanesulfonyl) imide, see ITE Battery Letters Vol. 1 (1999), page 105 to 109.
Es ist bekannt, daß Lithiumhexafluorphosphat in der Hitze zur Zersetzung neigt. Aufgabe der vorliegenden Erfindung ist es, stabilisierte Gemische mit Lithiumhexaflu- orphosphat anzugeben. Diese Aufgabe wird durch die vorliegenden Erfindung gelöst.It is known that lithium hexafluorophosphate tends to decompose in the heat. The object of the present invention is to provide stabilized mixtures with lithium hexafluorophosphate. This object is achieved by the present invention.
Die erfindungsgemäßen Gemische umfassen LiPF6 und mindestens eine Verbindung mit der Formel (I) R1C(0)NR2R3. Dabei steht R1 für CF3 oder R4CF2; R2 , R3 und R4 sind gleich oder verschieden und stehen für lineares oder verzweigtes C1-C3- Alkyl . R2 , R3 und R4 können auch für lineares oder verzweigtes C1-C3-Alkyl, welches durch mindestens 1 Halogenatom, vorzugsweise mindestens 1 Fluoratom substituiert ist, stehen.The mixtures according to the invention comprise LiPF 6 and at least one compound having the formula (I) R 1 C (0) NR 2 R 3 . there R 1 is CF 3 or R 4 CF 2 ; R 2 , R 3 and R 4 are the same or different and stand for linear or branched C1-C3-alkyl. R 2 , R 3 and R 4 can also represent linear or branched C1-C3 alkyl which is substituted by at least 1 halogen atom, preferably at least 1 fluorine atom.
Gemäß einer Ausführungsform der Erfindung bestehen die Gemische aus LiPF6 und mindestens einem der genannten Verbindungen der Formel (I) . Die Verbindung oder die Verbindungen der Formel (I) wirken dann als Lösemittel und bewirken gleichzeitig die Stabilisierung der Lösung. Das LiPF6 liegt zweckmäßig in einer Konzentration von mindestens 0,5 Mol/1 des Gemisches vor, wenn dieses Gemisch unmittelbar als Elektrolyt eingesetzt werden soll. Zwar ist es natürlich möglich, kleinere Konzentrationen an Lithiumhexafluorphosphat vorzusehen - dann ist die Leitfähigkeit entsprechend geringer. Obere Grenze in diesem Fall ist die Sättigungskonzentration an LiPF6 im verwendeten Acetamid. Für sofort einsetzbare Lösungen weisen Gemische mit LiPF6-Konzentrationen von etwa 0,8 bis 1,2 Mol/1 optimale Leitfähigkeit auf. Gewünschtenfalls kann die Konzentration auch über die Sättigungsgrenze hinausgehen. Neben gelöstem LiPF6 liegt dann auch noch festes LiPFg vor. Dieses Fest/Flüssig-Ge isch kann, z. B. vor der Anwendung, durch Zusatz weiteren Lösungsmittels, entweder ebenfalls in Form von Amiden oder in Form von anderen bekannten Lösungsmitteln, in ein Gemisch überführt werden, welches lediglich gelöstes LiPF6 enthält. Das genannte Fest/Flüssig- Gemisch ist dann als Zwischenstufe für die Herstellung von Elektrolytlösungen anzusehen.According to one embodiment of the invention, the mixtures consist of LiPF 6 and at least one of the compounds of the formula (I) mentioned. The compound or the compounds of formula (I) then act as a solvent and at the same time bring about stabilization of the solution. The LiPF 6 is advantageously present in a concentration of at least 0.5 mol / l of the mixture if this mixture is to be used directly as an electrolyte. It is of course possible to provide smaller concentrations of lithium hexafluorophosphate - then the conductivity is correspondingly lower. The upper limit in this case is the saturation concentration of LiPF 6 in the acetamide used. For solutions that can be used immediately, mixtures with LiPF 6 concentrations of about 0.8 to 1.2 mol / 1 have optimal conductivity. If desired, the concentration can also exceed the saturation limit. In addition to dissolved LiPF 6, there is also solid LiPFg. This solid / liquid Ge isch z. B. before use, by adding further solvent, either likewise in the form of amides or in the form of other known solvents, in a mixture which only contains dissolved LiPF 6 . The solid / liquid mixture mentioned is then to be regarded as an intermediate stage for the production of electrolyte solutions.
Eine andere Ausführungsform enthält LiPF6, mindestens ein Amid der Formel (I) sowie mindestens ein weiteres, an sich bekanntes dipolares aprotisches Lösungsmittel. Bevorzugte weitere Lösungsmittel sind ausgewählt aus der Gruppe umfassend Dialkylcarbonat und Alkylencarbonat , wobei Alkyl vorzugsweise für C1-C3-Alkyl steht und Alkylen für Ethylen und Propylen. Brauchbar sind aber auch die in der Veröffentlichung J. Electrochem. Soc . genannten Typen von dipolaren aprotischen Lösungsmitteln, beispielsweise Lactone, Nitrile, Formamide, Acetamide, Pyrolidinone, Oxazolidinone, Imida- zolidinone, Nitroalkane, N,N-substituierte Urethane, Sulfo- lane, Dialkylsulfoxide und -sulfite und Trialkylphosphate . Bevorzugt sind die Alkylderivate bzw. Di- oder Trialkylderi- vate mit C1-C3-Alkyl. In solcherlei Gemischen ist dann das Amid der Formel (I) mindestens in einer auf das LiPF6 stabilisierend wirkenden Menge enthalten. Vorzugsweise enthalten solche Gemische 0,5 Mol/1 LiPF6 bis hin zur Sättigungsgrenze, 0,1 bis 99,9 Vol.-% mindestens einer Verbindung der Formel (I) und 99,1 bis 0,1 Vol.-% des oder der weiteren aprotischen dipolaren Lösungsmittel.Another embodiment contains LiPF 6 , at least one amide of the formula (I) and at least one further dipolar aprotic solvent known per se. Preferred further solvents are selected from the group comprising dialkyl carbonate and alkylene carbonate, where alkyl is preferably C1-C3-alkyl and alkylene for ethylene and propylene. However, those in the J. Electrochem publication are also useful. Soc. mentioned types of dipolar aprotic solvents, for example lactones, nitriles, formamides, acetamides, pyrolidinones, oxazolidinones, imidazolidinones, nitroalkanes, N, N-substituted urethanes, sulfolanes, dialkyl sulfoxides and sulfites and trialkyl phosphates. The alkyl derivatives or di- or trialkyl derivatives with C1-C3-alkyl are preferred. The amide of the formula (I) is then contained in such mixtures at least in an amount which has a stabilizing effect on the LiPF 6 . Such mixtures preferably contain 0.5 mol / 1 LiPF 6 up to the saturation limit, 0.1 to 99.9% by volume of at least one compound of the formula (I) and 99.1 to 0.1% by volume of the or of other aprotic dipolar solvents.
Auch in diesen Gemischen kann gewünschtenfalls LiPFg ü- ber die Sättigungsgrenze hinaus enthalten sein. Dies setzt voraus, daß vor der Anwendung als Elektrolyt weiteres Lösungsmittel zugesetzt wird, bis das LiPF6 vollständig in Lösung gegangen ist.If desired, LiPFg can also be contained in these mixtures beyond the saturation limit. This presupposes that further solvent is added before use as an electrolyte until the LiPF 6 has completely dissolved.
Ein weiterer Gegenstand der vorliegenden Erfindung ist die Verwendung der erfindungsgemäßen Gemische als Elektrolyt in wasserfrei arbeitenden Batterien sowie Li-Ionen-Batterien mit den erfindungsgemäßen Gemischen als Elektrolyt.Another object of the present invention is the use of the mixtures according to the invention as an electrolyte in water-free batteries and Li-ion batteries with the mixtures according to the invention as an electrolyte.
Vorteil der erfindungsgemäßen Gemische ist, daß sie auf das LiPFg eine stabilisierende Wirkung ausüben. Es wurde nämlich festgestellt, daß man die erfindungsgemäßen Gemische auf beispielsweise 90 °C erhitzen kann, ohne daß Zersetzungsprodukte beobachtet werden können (z. B. im 19F-NMR-Spektrum o- der im 31P-NMR-Spektrum) . Die vorliegenden Beispiele sollen die Erfindung weiter erläutern, ohne sie in ihrem Umfang einzuschränken.The advantage of the mixtures according to the invention is that they have a stabilizing effect on the LiPFg. It has been found that the mixtures according to the invention can be heated to, for example, 90 ° C. without decomposition products being observed (for example in the 19 F-NMR spectrum or in the 31 P-NMR spectrum). The present examples are intended to explain the invention further without restricting its scope.
BeispieleExamples
Allgemeines;General;
In einer Glove-Box wurden unter einer wasserfreien Stickstoffatmosphäre in einem 5 mm-NMR-Rohr mit Young-Ventil ca. 300 mg LiPF6 eingewogen.About 300 mg of LiPF 6 were weighed into a glove box under an anhydrous nitrogen atmosphere in a 5 mm NMR tube with a Young valve.
Dazu wurden ca. 0,6 bis 0,8 ml des/der Lösemittel gegeben und das Ventil verschlossen. Die Lösemittel wurden zuvor über Mo- lekularsieb getrocknet. Die feststoffhaltigen Lösungen waren etwa 1-3-molar an LiPF6.About 0.6 to 0.8 ml of the solvent (s) were added and the valve closed. The solvents had previously been dried over molecular sieves. The solids-containing solutions were approximately 1-3 molar in LiPF 6 .
Alle Proben wurden erst nach 18 h vermessen, wobei ein Teil dieser Proben auf 90 °C in einem Ölbad erhitzt wurden. Das Molverhältnis von Diethylcarbonat zum Acetamid betrug in den Gemischen 0,88:1. All samples were only measured after 18 hours, some of these samples being heated to 90 ° C. in an oil bath. The molar ratio of diethyl carbonate to acetamide in the mixtures was 0.88: 1.
Figure imgf000006_0001
Figure imgf000006_0001
Nur bei den erfindungsgemäßen Gemischen kam es nicht zur Bildung von Zersetzungsprodukten. Only in the mixtures according to the invention did no decomposition products form.

Claims

Patentansprüche claims
1. Gemisch umfassend LiPF6 und flüssige Verbindungen der allgemeinen Formel (I) R1C(0)NR2R3, worin R1 für CF3 oder R4CF2 steht, R2 und R3 gleich oder verschieden sind und für lineares oder verzweigtes C1-C3-Alkyl, vorzugsweise Methyl, stehen und R4 für C1-C3 -Alkyl oder durch mindestens 1 Halogenatom substituiertes C1-C3 -Alkyl stehen.1. Mixture comprising LiPF 6 and liquid compounds of the general formula (I) R 1 C (0) NR 2 R 3 , in which R 1 is CF 3 or R 4 CF 2 , R 2 and R 3 are identical or different and are for are linear or branched C1-C3-alkyl, preferably methyl, and R 4 is C1-C3-alkyl or C1-C3-alkyl substituted by at least 1 halogen atom.
2. Gemische nach Anspruch 1, wobei das LiPF6 in gelöster Form vorliegt.2. Mixtures according to claim 1, wherein the LiPF 6 is in dissolved form.
3. Gemische nach Anspruch 2, dadurch gekennzeichnet, daß LiPF6 in einer Konzentration von 0,5 Mol/1 bis hin zur Sättigungsgrenze vorliegt, vorzugsweise von 0,8 bis 1,2 Mol/1.3. Mixtures according to claim 2, characterized in that LiPF 6 is present in a concentration of 0.5 mol / 1 up to the saturation limit, preferably from 0.8 to 1.2 mol / 1.
4. Gemisch nach Anspruch 1, gekennzeichnet durch einen zusätzlichen Gehalt mindestens einen weiteren dipolaren, aprotischen Lösungsmittels.4. Mixture according to claim 1, characterized by an additional content of at least one further dipolar, aprotic solvent.
5. Gemisch nach Anspruch 4, dadurch gekennzeichnet, daß dipolare aprotische Lösungsmittel ausgewählt ist aus der Gruppe umfassend Alkylencarbonate, Lactone, Alkylnitrile, Al- koxyalkylnitrile, N,N-Dialkylformamide, N-Alkylpyrolidinone, N-Alkyloxazolidinone, N,N' -Dialkylimidazolidinone, Nitroal- kane, Sulfolane, Dialkylsulfoxide, Trialkylphosphate, Alkyla- cetate, Alkylether, Alkylendiether , Pyrocarbonate , Dialkylsulfite, wobei Alkyl vorzugsweise für C1-C3 -Alkyl steht und Alkylen vorzugsweise für Ethylen oder Propylen.5. Mixture according to claim 4, characterized in that dipolar aprotic solvent is selected from the group comprising alkylene carbonates, lactones, alkyl nitriles, alkoxyalkyl nitriles, N, N-dialkylformamides, N-alkylpyrolidinones, N-alkyloxazolidinones, N, N '-dialkylimidazolidinones , Nitroalkanes, sulfolanes, dialkyl sulfoxides, trialkyl phosphates, alkyl acetates, alkyl ethers, alkylene diethers, pyrocarbonates, dialkyl sulfites, alkyl being preferably C1-C3-alkyl and alkylene preferably being ethylene or propylene.
6. Verwendung von Verbindungen der allgemeinen Formel (I) R1C(0)NR2R3, worin R1, R2 und R3 die obengenannte Bedeutung besitzen, als Lösemittel oder stabilisierender Zusatz in Elektrolytlösungen von LiPF6. 6. Use of compounds of the general formula (I) R 1 C (0) NR 2 R 3 , in which R 1 , R 2 and R 3 have the meaning given above, as a solvent or stabilizing additive in electrolyte solutions of LiPF 6 .
7. Lithiumionenbatterie, enthaltend ein Gemisch der Ansprüche 1 bis 5 als Elektrolyt. 7. lithium ion battery containing a mixture of claims 1 to 5 as an electrolyte.
PCT/EP2000/008438 1999-09-03 2000-08-30 MIXTURES WITH LiPF¿6? WO2001017904A1 (en)

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US7337001B2 (en) * 2001-05-30 2008-02-26 Medtronic, Inc. Implantable medical device and method with a dual power source incorporating electrolyte additive 2,2,2-trifluoroacetamide
US7191008B2 (en) 2001-05-30 2007-03-13 Medtronic, Inc. Implantable medical device with a dual power source

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EP0902492A1 (en) * 1997-09-11 1999-03-17 Hydro-Quebec Solvents and new electrolytic compositions having a large stability range and high conductivity
WO2000038259A1 (en) * 1998-12-19 2000-06-29 Solvay Fluor Und Derivate Gmbh Electrolyte system for lithium batteries, the use thereof and method for enhancing safety of lithium batteries

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