Patent DE-102008040941-A1 (DE)
Title: Electrolyte mixture, useful to prepare lithium-ion cells, comprises polypyrrole, conducting salt e.g. lithium hexafluorophosphate, aprotic solvent or mixture of e.g. dimethoxyethane and ethylene carbonate, and mineral additive e.g. cement
Inventor: NAARMANN HERBERT
IPC: H01M10/052
Filed: 2008-08-01
Abstract: Electrolyte mixture comprises 20-50 wt.% of polyvinylpyrrolidone homo- and/or copolymer, polyaniline and/or polypyrrole with a molecular weight of 3000-20000; 20-10 wt.% of a conducting salt, preferably on basis of lithium hexafluorophosphate or lithium compounds; 30-20 wt.% of aprotic solvent or a solvent mixture of dimethoxyethane, ethylene carbonate, propylene carbonate or alkyl carbonate; and 30-20 wt.% of a mineral additive, preferably oxide, carbonate, oxalate, silicate and/or borate of lithium, sodium, potassium, calcium, magnesium and/or cement. Electrolyte mixture comprises 20-50 wt.% of polyvinylpyrrolidone homo- and/or copolymer, polyaniline and/or polypyrrole with a molecular weight of 3000-20000; 20-10 wt.% of a conducting salt, preferably on basis of lithium hexafluorophosphate, or lithium compound of formula (LiPF 5R 1), (LiPF 4(R 1) 2) or LiPF 3(R 1) 3; 30-20 wt.% of aprotic solvent or a solvent mixture of dimethoxyethane, ethylene carbonate, propylene carbonate or alkyl carbonate; and 30-20 wt.% of a mineral additive, preferably oxide, carbonate, oxalate, silicate and/or borate of lithium, sodium, potassium, calcium, magnesium and/or cement. R 1CF 3, C 2F 5or C 3H 7. Independent claims are included for: (1) a lithium-ion cell comprising an anode, cathode and separator, where the anode and cathode comprises the electrolyte mixture; and (2) a process for the preparation of the lithium-ion cell comprising degassing an electrically active anode mass e.g. lithium intercalated natural or synthetic graphite at 20-100[deg] C and 0.1-2 Pa, abolishing vacuum by adding the electrolyte mixture, intensively stirring the anode mass under air and moisture exclusion and tribiochemically condensing the mixture, where the subsequent application of the anode mass, as 20-50 mu m thick layer on purified copper arrester also takes place under air and moisture exclusion, or degassing an electro-chemically active cathode mass comprising lithium-intercalated heavy metal oxide or a mixture of cobalt, nickel, chromium, manganese, molybdenum, and lithium-iron-phosphate and/or lithium-vanadium-phosphate at 20-100[deg] C and 0.1-2 Pa; adding the electrolyte mixture to the cathode mass under the abolition of vacuum; intensively stirring (tribiochemically condensed) under air and moisture exclusion and applying the cathode mass as 20-50 mu m thick layer on the primed aluminum foil, or reacting a separator mass comprising 30-40 wt.% of perfluoroelastomer, 20-40 wt.% of aprotic solvents, 20-24 wt.% of the conducting salt and 25-1 wt.% of scaffolding substances, cements, silicates, sodium, potassium, calcium, magnesium carbonate with the electrolyte mixture, intensively mixing under the exclusion of air and moisture, extruding or applying the mixture as a foil with at thickness of 20-50 mu m, or coating one or both side of a porous separator foil with the electrolyte mixture and incorporating the foil as a separate foil between the anode and cathode under the exclusion of air and moisture, or connecting two or more lithium-ion cell preferably by parallel circuit.