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Quantitative determination of Mn3+ content in LiMn1.5Ni0.5O4 spinel cathodes by magnetic measurements
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10.1063/1.4722927
/content/aip/journal/apl/100/21/10.1063/1.4722927
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/21/10.1063/1.4722927

Figures

Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

(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).

Image of FIG. 4.
FIG. 4.

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.

Tables

Generic image for table
Table I.

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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/content/aip/journal/apl/100/21/10.1063/1.4722927
2012-05-25
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Quantitative determination of Mn3+ content in LiMn1.5Ni0.5O4 spinel cathodes by magnetic measurements
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/21/10.1063/1.4722927
10.1063/1.4722927
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