N. Kumagai et al., PREPARATION AND ELECTROCHEMICAL CHARACTERISTICS OF A NEW LI-MN-V-O SYSTEM FORMED FROM HEAT-TREATMENT OF A MNO2, NH4VO3 AND LINO3 MIXTURE, Journal of Applied Electrochemistry, 24(11), 1994, pp. 1176-1181
New quarternary oxides (Li2O)(x).MnO2.yV(2)O(5) (x = 0.125 similar to
0.25, y = 0.125 similar to 0.25), formed by heating mixtures of MnO2,
NH4VO3 and LiNO3 at various Li/Mn and V/Mn atomic ratios and at differ
ent temperatures (300 similar to 400 degrees C) in air, have been char
acterized by X-ray diffraction, X-ray photoelectron spectroscopy (ESCA
) and infrared spectroscopy. The quarternary oxide with x = 0.25 and y
= 0.25 showed a discharge capacity of 220 Ah (kg oxide)(-1) and an en
ergy density of ca. 600 Wh (kg oxide)(-1) at a current density of 0.20
mA cm(-2) in 1 M LiClO4-propylene carbonate at 25 degrees C. When cha
rge-discharge cycling with the (Li2O).MnO2.0.25V(2)O(5) electrode was
performed at a constant capacity of 30 Ah (kg oxide)(-1) and at a cons
tant current density of 0.10 0.20 mA cm(-2), the electrode sustained o
ver 100 cycles at a high mean discharge potential of ca. 3V vs Li/Li+.