Preparation and electrochemical properties of the layered material of LixVyO2 (x = 0.86 and y = 0.8)
作者： Kiyoshi Ozawa , Lianzhou Wang , Hiroki Fujii , Mika Eguchi , Masashi Hase
DOI: 10.1149/1.2135220
关键词: Cathode 、 Crystallography 、 Oxide 、 Trigonal crystal system 、 Electrochemistry 、 Vanadium 、 Inorganic chemistry 、 Materials science 、 Ion 、 Structural stability 、 Octahedron
摘要: Layered lithium-vanadium oxide with a composition of LixVyO2 (x = 0.86 and y 0.8) was prepared by the hydrothermal reaction V2O3 LiOH center dot H2O at 180 degrees C. This material corresponds to layered rhombohedral structure related alpha-NaFeO2 in which vanadium ions are disordered alternate layers octahedral 3a (0, 0, 0) 3b 1/2) sites. The electrochemical properties this Li0.86V0.8O2 were investigated compared those Li0.96VO2 made conventional solid-state reaction. It found that capacity reversibility significantly improved material; reversible specific capacities Li/Li0.86V0.8O2 Li/Li0.96VO2 systems similar 100 50 mAh g(-1), respectively, under current densities 7.14 mA g(-1) over 20 charge-discharge cycles potential window 1.50-4.50 V. Such results from structural stability Li0.86V0.8O2, whereas increase can be qualitatively interpreted terms presence vacancies structure. (c) 2005 Electrochemical Society.
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