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XRD patterns of the LiMn1.5Ni0.5O4 spinel samples (a) synthesized at 900 °C and (b) after annealing the 900 °C samples in air at 700 °C.
Electrochemical first charge/discharge curves at a C/6 rate (1C = 146.7 mA/g) of the LiMn1.5Ni0.5O4 spinel samples (a) synthesized at 900 °C and (b) after annealing the 900 °C samples at 700 °C and (c) SEM images of the spinel particles with different morphologies. The numbers in (a) and (b) represent the Mn3+ contents calculated from the capacity in the 4 V region.
(a) Magnetization versus applied field for the 900 °C commercial sample at 5, 30, and 50 K with corresponding linear regression in the 10–30 kOe range and (b) the saturation magnetization plotted versus T3/2 with linear regression. The saturation magnetization is taken as the y-intercept of the regression lines from (a).
Variation of the magnetization extrapolated to 0 K with the Mn3+ content obtained from the electrochemical capacity values. The line represents the magnetic moment values based on Eq. (2) with N Mn = 1.5 and N Ni = 0.5.
Extrapolated moment per formula unit (FU) at 0 K and the Mn3+ contents calculated from the electrochemical capacity values and magnetic data for the LiMn1.5Ni0.5O4 spinel samples synthesized at 900 °C and after annealing the 900 °C samples in air at 700 °C.
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