• MD MOFASSER MALLICK

      Articles written in Bulletin of Materials Science

    • Thermo-transport properties of Zn-substituted layered Li-nickel oxide, LiNiO$_2$

      MD MOFASSER MALLICK SATISH VITTA

      More Details Abstract Fulltext PDF

      The layered Li-TM-O$_2$ materials have been investigated extensively due to their application as cathodes in Li batteries. The electrical properties of these oxides can be tuned or controlled either by non-stoichiometry or substitution.Hence the thermo-transport properties of Zn-substituted LiNi$_{1−x}$Zn$_x$O$_2$ for $0 \leq x \leq 0.16$ have been investigated in thetemperature range of 300–900 K for potential application as a high-temperature thermoelectric material. For $x$ < 0.08, the compounds were of single phase belonging to the space group R-3mH while for $x$ > 0.08 an additional minority phase, ZnO forms together with the main layered phase.All the compounds exhibit a semiconducting behaviour with electrical resistivity,varying in the range of $\sim$10$^{−4}$ to 10$^{−2}$ $\Omega$m between 300 and 900 K. The electrical resistivity is found to increase with increasing Zn-substitution predominantly due to a decrease in the charge carrier hole mobility. The activation energy remains constant, $\sim$10 meV, with Zn-substitution. The Seebeck coefficient of the compounds is found to decrease with increasingtemperature and increase with increasing Zn-substitution. The Seebeck coefficient decreases from $\sim$95 to 35 $\mu$μV K$^{−1}$ and the corresponding power factor is $\sim$12 $\mu$Wm$^{−1}$ K$^{−2}$ for the $x = 0.16$ compound.

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