Abstract
A lithium–manganese oxide, Li x MnO2 (x = 0.30.6), has been synthesized by heating a mixture (Li/Mn ratio = 0.30.8) of electrolytic manganese dioxide (EMD) and LiNO3 in air at moderate temperature, 260 ∘C. The formation of the Li–Mn–O phase was confirmed by X-ray diffraction, atomic absorption and electrochemical measurements. Electrochemical properties of the Li–Mn–O were examined in LiClO4-propylene carbonate electrolyte solution. About 0.3 Li in Li x MnO2 (x = 0.30.6) was removed on initial charging, resulting in characteristic two discharge plateaus around 3.5 V and 2.8 V vs Li/Li+. The Li x MnO2 synthesized by heating at Li/Mn ratio = 0.5 demonstrated higher discharge capacity, about 250 mAh (g of oxide)−1 initially, and better cyclability as a positive electrode for lithium secondary battery use as compared to EMD.
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Kumagai, N., Saito, T. & Komaba, S. Synthesis of ternary Li–Mn–O phase at a temperature of 260 ∘C and electrochemical lithium insertion into the oxide. Journal of Applied Electrochemistry 30, 159–163 (2000). https://doi.org/10.1023/A:1003819905672
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DOI: https://doi.org/10.1023/A:1003819905672