Journal of The Electrochemical Society · 2012 · 67 citations · 24 references
Natural SciencesChemical EngineeringMaterials ScienceElectrochemical EngineeringElectrochemistrySurface ScienceBattery MaterialsCathode MaterialsElectrochemical CellsElectrochemical Energy StorageElectrode MaterialsElectrode-electrolyte InterfacesElectrochemical CharacterizationElectrode Degradation MechanismsElectrolyte ChemistryEx-situ CharacterizationHigh-voltage ElectrolytesLithium-ion Battery Electrodes Based On Metal OxidesScanning Electron MicroscopyScanning Electron Microscopy Analysis
The cycling performance of Li/LiNi0.5Mn1.5O 4 cells with 1.0 M LiPF6 in ethylene carbonate (EC)/ethyl methyl carbonate (EMC) (3:7) with and without added dimethyl methylphosphonate (DMMP) (0.5-1.0%) was investigated. Addition of DMMP resulted in improved capacity retention during cycling to high voltage (4.9 V vs Li). Ex-situ surface analysis of LiNi0.5Mn1.5O4 electrodes after cycling via Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS) and Infrared (IR) spectroscopy suggest that addition of DMMP inhibits electrolyte decomposition on the surface of the cathode. Addition of DMMP also inhibits the dissolution of Mn from LiNi0.5Mn1.5O 4 particles stored in electrolyte at 85 °C. © 2012 The Electrochemical Society.
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Challenges for Rechargeable Li Batteries
John B. Goodenough, Youngsik Kim · Chemistry of Materials · 2009 · 10.8K citations
Natural Sciences, Materials Engineering, Materials Science +10