Abstract
In this paper, we report the measurements of impedance spectroscopy for a new olivine-type lithium deficiency Li0.9□0.1NiV0.5P0.5O4 compound. It was synthesized by the conventional solid-state technique. All the X-ray diffraction peaks of the compound are indexed, and it is found that the sample is well crystallized in orthorhombic olivine structure belonging to the space group Pnma. Conductivity and dielectric analyses of the sample are carried out at different temperatures and frequencies using the complex impedance spectroscopy technique. The electrical conductivity of Li0.9□0.1NiV0.5P0.5O4 is higher than that of parent compound LiNiV0.5P0.5O4. Temperature dependence of the DC conductivity and modulus was found to obey the Arrhenius law. The obtained values of activation energy are different which confirms that transport in the title compound is not due to a simple hopping mechanism. To determine the conduction mechanism, the AC conductivity and its frequency exponent have been analysed in this work by a theoretical model based on quantum mechanical tunnelling: the non-overlapping small polaron tunnelling model.
Highlights
AC conductivity, DC conductivity and dielectric dispersion are characteristics of many ionic conductors
We report the measurements of impedance spectroscopy for a new olivine-type lithium deficiency Li0.9 0.1NiV0.5P0.5O4 compound
To determine the conduction mechanism, the AC conductivity and its frequency exponent have been analysed in this work by a theoretical model based on quantum mechanical tunnelling: the non-overlapping small polaron tunnelling model
Summary
AC conductivity, DC conductivity and dielectric dispersion are characteristics of many ionic conductors. Olivine-type compounds are of great interest as candidate materials for lithium-ion batteries, ever since the discovery of the insertion–deinsertion properties of lithium in LiFePO4 [1]. The previously studied oxide LiNiV0.5P0.5O4 [7], which belongs to the olivine-type family, is a promising cathode material for application in lithium-ion batteries. Comes our idea of creating a vacancy in the lithium site of LiNiV0.5P0.5O4 compound, for the research of a new cathodic material. In this present paper, we report here for the first time the electric, dielectric properties and the conduction mechanism of Li0.9 0.1NiV0.5P0.5O4 mixed oxide by means of impedance spectroscopy
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