• Vol 8, No 8 (2017)
  • Metalurgy and Material Engineering

Synthesis and Electrochemical Characterization of New Li2O-P2O5 Compounds for Solid Electrolytes

Heri Jodi, Anne Zulfia Syahrial, Sudaryanto Sudaryanto, Evvy Kartini

Corresponding email: herieldi@gmail.com


Published at : 27 Dec 2017
IJtech : IJtech Vol 8, No 8 (2017)
DOI : https://doi.org/10.14716/ijtech.v8i8.681

Cite this article as:
Jodi, H., Syahrial, A.Z., Sudaryanto, S., Kartini, E., 2017. Synthesis and Electrochemical Characterization of New Li2O-P2O5 Compounds for Solid Electrolytes. International Journal of Technology. Volume 8(8), pp.1516-1524
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Heri Jodi - National Nuclear Energy Agency, Center for Science and Technology of Advanced Materials (PSTBM BATAN), Indonesia
- Department of Metalurgy and Material Engineering, Faculty of Engineering, Univ
Anne Zulfia Syahrial Department of Metallurgical and Materials Engineering, Faculty of Engineering, Universitas Indonesia
Sudaryanto Sudaryanto National Nuclear Energy Agency, Center for Science and Technology of Advanced Materials (PSTBM BATAN), Indonesia
Evvy Kartini National Nuclear Energy Agency, Center for Science and Technology of Advanced Materials (PSTBM BATAN), Indonesia
Email to Corresponding Author

Abstract
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The solid electrolyte is of great interest owing to its potential to be applied in a wide variety of electrochemical devices. One of the most stable solid electrolytes is lithium phosphate (Li3PO4). However, this compound has low enough conductivity to be applied to a device such as an electrolyte. A previous study has reported that the mixture of xLi2O-P2O5, where x=2, has a greater conductivity than Li3PO4, while, when x=1, this yields an amorphous structure. In this study, new compositions of the xLi2O-P2O5 compounds, where 1?x?2, were prepared through solid-state reactions. The prepared compounds were characterized using X-ray Diffraction Spectrometry (XRD), Scanning Electron Microscopy (SEM), and Electrochemical Impedance Spectroscopy (EIS) measurements in order to investigate their structure, morphology, and electrochemical properties. The XRD characterization showed that both of the samples were composed mainly of Li4P2O7 crystals. Agglomeration of particles was observed in the samples. The conductivity of the compounds was of the order of 10?6 S/cm, which was higher by three orders of magnitude than that of Li3PO4. The evaluated power exponent of conductivity indicated that the long-range drift of ions may be one of the sources of ion conduction in both of the observed samples. The nature of the dielectric loss indicated that the conduction in the samples was more predominantly DC conduction.

Solid electrolytes; Li2O-P2O5;Electrochemical impedance spectrometry; Conductivity; Dielectric

Conclusion

In this current work, we have successfully synthesized xLi2O-P2O5 compounds where x=1.5 and x=1.8 by using a solid-state reaction. The XRD spectral data indicated that all of the compounds were composed mainly of Li4P2O7 crystals. Minor phases of LiPO3 and Li3PO4 were present in both compositions, but more phases were found in the composition where x=1.5. The two compounds had the same agglomerated structure, but the compound where x=1.5 had a smaller agglomerate size. The impedance spectra of the two compounds had the same characteristics, although the compound where x=1.5 had lower resistance, and hence better conductivity. The DC conductivity of both compounds was of the order of 10?6 S/cm, which was higher by three orders of magnitude than that of Li3PO4. The value of the AC-conductivity parameters for the higher frequency revealed that the long-range drift of ions may be one of the sources of ion conduction in the compounds.

Acknowledgement

Financial support from the Ministry of Research, Technology, and Higher Education of the Republic of Indonesia through the Research Grant No. 278/SP2H/LT/DRPM/III/2016 is gratefully acknowledged. The authors would like to thank the Center for Science and Technology of Advanced Materials, the National Nuclear Energy Agency and the Department of Metallurgy and Materials Engineering, Universitas Indonesia for the great support.

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