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Dielectric studies and conduction mechanism of Zn and Ag modified LiMn2O4 synthesized by solution combustion method

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Abstract

In the present work, Zn- and Ag-modified LiMn2O4 [LiZn x Ag y Mn(2−x−y)O4 (where x = 0.5 and y = 0.01, 0.03, 0.05 mol%), herein referred to as LZMA0–3] cathode materials were synthesized using solution combustion method. Powder XRD results revealed the formation of phase-pure products possessing spinel structure without any impurity. Morphology studies clearly showed the formation of well-defined truncated octahedral grains with an average grain size of about 1.57 μm and a narrow particle size distribution. Dielectric parameters such as dielectric constant, dielectric loss, impedance and electric modulus were found to depend on temperature and frequency. From the calculated values of activation energy, electrons were found to be the charge carriers responsible for conduction in the material. AC conductivity was found to increase with an increase in temperature. The correlated barrier hopping model of conduction mechanism was confirmed by the decrease in frequency exponent with increase in temperature.

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Acknowledgements

Anbarasi P. thankfully acknowledges the financial support from University Grants Commission, New Delhi, in the form of UGC–RGNF (Rajiv Gandhi National Fellowship).

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Authors and Affiliations

  1. Department of Ceramic Technology, A.C. Tech Campus, Anna University, Chennai, 600025, India

    Anbarasi Pugazhendhi, SatheeshKumar Ellappan, Ilango Kumaresan & Manohar Paramasivam

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  1. Anbarasi Pugazhendhi
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  2. SatheeshKumar Ellappan
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  3. Ilango Kumaresan
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  4. Manohar Paramasivam
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Correspondence to Manohar Paramasivam.

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Pugazhendhi, A., Ellappan, S., Kumaresan, I. et al. Dielectric studies and conduction mechanism of Zn and Ag modified LiMn2O4 synthesized by solution combustion method. Appl. Phys. A 123, 407 (2017). https://doi.org/10.1007/s00339-017-1021-3

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