Grain size effects on the transport properties of Li3V2(PO4)3 glass–ceramic nanocomposites for lithium cathode batteries

Aref Al-Syadi, M. S. Al-Assiri, Hassan M. A. Hassan, M. M. El-Desoky

Research output: Contribution to journalJournal articlepeer-review

12 Scopus citations

Abstract

The effect of grain size on the structural and transport properties of glass–ceramic nanocomposites consisting of Li3V2(PO4)3 crystals were investigated by differential scanning calorimeter, X-ray diffraction (XRD), transmission electron micrograph (TEM), density (d) and dc conductivity. XRD patterns exhibit the formation of Li3V2(PO4)3 with monoclinic structure. It was shown by XRD and TEM studies that by appropriate heat-treatment glasses can be turned into glass–ceramic nanocomposites consisting of crystallites smaller than 56 nm embedded in the glassy matrix. Density was found to increase with increasing grain size while the molar volume decreases. The dc conductivity measured in high temperature range increased with decreasing of the grain size while the activation energy decreased. The calculated dc conductivity at 400 K for the present glass was 5.77 × 10−7 S/cm, while in its glass–ceramic nanocomposites was in the range of 1.712 × 10−5–2.10 × 10−6 S/cm. On the other hand, the calculated activation energy for the present glass was 0.542 eV, while in its glass–ceramic nanocomposites was in the range of 0.165–0.468 eV. The increase in electrical conductivity in the glass–ceramic nanocomposite annealed at 450 °C for 4 h compared to that annealed at 450 °C for 2, 8, 24 h can be attributed to the decrease in grain boundary scattering due to the reduction in grain size. The conduction was confirmed to obey non-adiabatic small polaron hopping. The electron–phonon interaction coefficient (γp) was calculated and found to be in the range of 5.09–16.64.

Original languageEnglish
Pages (from-to)4074-4083
Number of pages10
JournalJournal of Materials Science: Materials in Electronics
Volume27
Issue number4
DOIs
StatePublished - 1 Apr 2016
Externally publishedYes

Fingerprint

Dive into the research topics of 'Grain size effects on the transport properties of Li3V2(PO4)3 glass–ceramic nanocomposites for lithium cathode batteries'. Together they form a unique fingerprint.

Cite this