Journal of The Electrochemical Society · 1998 · 138 citations · 0 references
Natural SciencesChemistryMaterials ScienceElectrochemical EngineeringElectrochemistryEnergy MaterialsBattery MaterialsCathode MaterialsElectrochemical CellsElectrochemical Energy StorageElectrode MaterialsElectrolyte SolutionsCathode Active MaterialsHigh-voltage Cathode MaterialsHigh-voltage CathodesHigh-voltage ElectrolytesLithium-ion Battery Cathode MaterialsLithium-ion Battery ElectrolytesLithium-ion Battery MaterialsRechargeable Batteries
To improve the anodic stability of ambient temperature electrolytes, a nontoxic solvent based on the sulfone polar group has been synthesized and evaluated in the presence of high potential cathode materials. Solutions of high stability salts such as and Li imide in this solvent, withstand 5.8 V vs. before onset of oxidation, defined by a stringent criterion, even in the presence of high surface area electrodes such as activated charcoal on Pt. Reversible Li deposition and stripping is observed at negative potentials. This means not only that a wide range of overcharge protection is available for high voltage cathodes in current use, but also that exotic cathodes accepting electrons up to 5.5 V from may now be incorporated in rechargeable lithium cells.