Infrared and Raman spectroscopy of nanostructured LT-LiCoO2 cathodes for Li-ion rechargeable batteries |
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| Authors: | Christopher M Burba KM Shaju Peter G Bruce Roger Frech |
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| Institution: | aDepartment of Natural Sciences, Northeastern State University, 600 N. Grand Ave., Tahlequah, OK 74464, USA;bSchool of Chemistry, University of St. Andrews, Fife KY16 9ST, Scotland, United Kingdom;cDepartment of Chemistry and Biochemistry, University of Oklahoma, Norman, OK 73071, USA |
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| Abstract: | Nano-engineered electrodes, such as porous LiCoO2, exhibit improved electrochemical performance compared to the non-porous LiCoO2 analogue. Structural studies of the pore walls composing the nanostructured LiCoO2 materials have focused on long-range (diffraction) methods. However, the powder diffraction patterns of the low-temperature (LT) and high-temperature (HT) phases of non-porous LiCoO2 are very similar and distinguishing the two phases can be challenging. In this work, infrared and Raman spectroscopy are used to unambiguously assign the LiCoO2 crystalline domains present in two porous compounds (nanowire LiCoO2 and mesoporous LiCoO2) as LT-LiCoO2. Moreover, the appearance of new bands in the infrared spectrum of LiCoO2 nanowires might signal the presence of disordered LiCoO2 domains that are XRD silent. |
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| Keywords: | Lithium batteries LiCoO2 cathodes Mesoporous materials IR spectroscopy Raman spectroscopy |
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