Spectroelectrochemical studies on highly polarized LiCoO2 electrode in organic solutions |
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| Institution: | 1. Institute of Evolutionary Biology and Environmental Studies, University of Zurich, Switzerland;2. Instituto de Investigación en Recursos Cinegéticos IREC (CSIC-UCLM-JCCM), Ciudad Real, Spain;3. Departamento de Ciencias Ambientales, Facultad de Ciencias Ambientales y Bioquímica, Universidad de Castilla-La Mancha, Toledo, Spain;4. Department of Integrative Ecology, Estación Biológica de Doñana (EBD-CSIC), Seville, Spain;5. Departamento de Ecología Evolutiva, Museo Nacional de Ciencias Naturales (CSIC), Madrid, Spain;1. School of Mechanical and Electronic Engineering, Suzhou University, Suzhou 234000, PR China;2. Anhui Key Laboratory of Spin Electron and Nanomaterials, Suzhou University, Suzhou 234000, PR China;1. Intermolecular Inc., 3011 North First Street, San Jose, CA 95134, USA;2. Google Inc., Mountain View, CA 94043, USA |
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| Abstract: | In situ Raman spectroscopy was conducted on thin film electrodes of pure LiCoO2 in order to observe the nature of the changes in interfacial structure between LiCoO2 and organic solutions (propylene carbonate and ethylene carbonate containing 1 M LiClO4) when LiCoO2 is scanned up to highly anodic potentials (∼5.0 V Li+/Li). Raman spectra and cyclic voltammograms were recorded simultaneously during the potential scan. We observed a sudden increase in the background signals of the Raman spectra at potentials more positive than 4.7 V. The increased background did not change after potential cycling. The change was irreversible, indicating that surface film formation occurred at positive potentials. As organic compounds fluoresce by visible light, the increased background is ascribed to the formation of a film on the LiCoO2 electrode surface in organic solutions. |
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