Visualization of phase boundary movement in intercalation cathodes for thin-film lithium batteries

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Visualization of a phase boundary of intercalation cathodes for lithium-ion batteries was investigated by using in-situ micro-Raman spectroscopy. The movement of the phase boundary, which dominates the reaction rate for lithium-ion battery cathode, was evaluated quantitatively using this technique. The structural change of the cathode materials, such as a lithium cobalt oxide (LiCoO_2)and a lithium manganese oxide (LiMn_2O_4), was systematically investigated by in situ micro Raman spectroscopy.