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DYNA

versão impressa ISSN 0012-7353

Resumo

NARVAEZ-SEMANATE, José Luis et al. Obtention and characterization of lithium superionic conductors using the glass-ceramic method. Dyna rev.fac.nac.minas [online]. 2018, vol.85, n.205, pp.148-156. ISSN 0012-7353.  http://dx.doi.org/10.15446/dyna.v85n205.70273.

This paper proposes the glass-ceramics method for obtaining lithium ion (Li+) solid electrolytes. This technique provides high chemical and microstructural homogeneity as well as low porosity. Glass samples were subjected to either single or double heat treatments, between 700 °C and 1000 °C, in order to obtain the glass-ceramics. Differential Scanning Calorimetry - DSC - results evidenced the possibility of fabricating these ceramics from glass in the system Li2O·Al2O3·TiO2·P2O5. Samples observed by Scanning Electron Microscopy - SEM - showed a finely grained microstructure which was homogeneously distributed and non-porous. X-ray Diffraction - XRD - patterns showed the formation of the high conducting phase LiTi2(PO4)3. A high ionic conductivity, in the order of 10-3 S/cm at 1000 °C, was measured by Impedance Spectroscopy - IS. It suggests that the synthesis method used in this research is useful for fabricating lithium ion glass-ceramics and opens up a new alternative for manufacturing different electrical ceramics.

Palavras-chave : glass-ceramics; lithium ion batteries; impedance spectroscopy; superionic conductors; Li2O·Al2O3·TiO2·P2O5 system.

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