Li2MnO3 content effects on thermal,structural, electrical and electrochemical properties of xLi2MnO3-(1-x)LiNi0.9Zn0.1O2 cathode materials |
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| Authors: | Paulos Taddesse Shibeshi Wondimu Barana Bunuko Yadeta C. Chemeda |
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| Affiliation: | 1. Department of Physics, College of Natural Sciences, Arba Minch University, Ethiopia;2. Renewable Energy Research Center, Arba Minch University, Ethiopia;3. Adama Science and Technology University, School of Applied Natural Science, Department of Applied Geology, 1888, Adama, Ethiopia |
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| Abstract: | xLi2MnO3-(1-x)LiNi0.9Zn0.1O2 (x = 0.1, 0.2 and 0.3) cathodes were prepared by two steps solid-state reaction method. Layered crystalline phases (space groups of C2/m for Li2MnO3 and R3m for LiNi0.9Zn0.1O2) were detected in all cathodes. FTIR study also revealed the formation of the layered-type structures of all cathodes. The structural parameters were greatly influenced by the contents of Li2MnO3 in xLi2MnO3-(1-x)LiNi0.9Zn0.1O2. The electrical conductivities were found in the range of 1.2 × 10?6 to 2.7 × 10?6 S/cm. The dielectric spectra revealed the interfacial polarization Maxwell–Wagner type dielectric dispersion existing in all samples. The cathodes delivered the discharge capacities of 149 (x = 0.1), 151 (x = 0.2) and 157 mAh/g (x = 0.3) with capacity retention between 94.6 and 96.8% when they were cycled from 3.0 to 4.5 V under 0.1C rate. The x = 0.3 cathode exhibited the highest cyclic performance (96.8%) after 10 cycles due to its lower cations disorder. |
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| Keywords: | Solid state synthesis Layer structure Electrical conductivity Capacity retention Cyclic performance |
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