a National Institute of Advanced Industrial Science & Technology, 2217-14 Hayashi-cho, Takamatsu, 761-0395, Japan
b Department of Chemistry, Faculty of Science, Chiba University, 1-33 Yayoi, Inage, Chiba, 263-8522, Japan
Abstract:
Microwave irradiation of a suspension of γ-MnOOH in a 4 mol dm−3 LiOH solution brought about a rapid formation of semicrystalline orthorhombic LiMnO2 (o-LiMnO2) within 30 min at 120°C. Cubic Li1.6Mn1.6O4 was obtained by heating o-LiMnO2 at 400°C; lithium could be topotactically extracted from Li1.6Mn1.6O4 with acid to form cubic H1.6Mn1.6O4.