Electrochromism of spinel‐type manganese oxide accompanying an Li + ‐insertion in an aqueous phase was examined by visual light spectrometry. An absorbance spectrum for lithiated manganese oxide gave lower absorbance in the wavelength range <700 nm than did an Li + ‐extracted one. The greatest difference was observed at ∼ 450 nm and is explained by the difference between the spectra for Mn 3 + and Mn 4 + . A reversible change in absorbance at 450 nm occurred with the Li + ‐insertion/extraction reaction. Cyclic voltammetry indicated that the absorbance change couples with the electrochemical response of the manganese oxide to Li + ions.
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Kanoh et al. (1996) studied this question.