Investigation of structure and properties of Li/Na ion conducting electrolytes and electrode materials

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Trussov, Ivan ORCID: https://orcid.org/0000-0002-6534-1389 (2019). Investigation of structure and properties of Li/Na ion conducting electrolytes and electrode materials. University of Birmingham. Ph.D.

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Abstract

This thesis describes the synthesis, structure and properties of a range of materials to be used in Li/Na ion batteries. As potential solid electrolytes, Si/B doped lithium lanthanum titanium oxide (LLTO) perovskites, Na doped Nb/Ta/Zr-based garnets and mixed Na/K-Mg sulphates were studied. The oxoanion doped eldfellite material and mixed Na/K-Ti/V phosphates were studied as potential cathode materials. The silicon and boron doped LLTO perovskites were shown to have better sinterability but have a lower ionic conductivity. Na doped garnets demonstrated the ability to incorporate Na onto the La site with partial incorporation to the Li site as well, therefore blocking Li transport. New systems were reported for Na-Mg sulphates. The detailed X-ray diffraction study of \(Na_2Mg_2(SO_4)_3\) highlights enormous complexities within the system. The thermal evolution of these phases was studied. The eldfellite \(NaFe(SO_4)_2\) was demonstrated to be able to have 25% of sulphate replaced with hydrophosphate and selenate anions without degrading the structure. Mixed Na/K-Ti/V phosphates were shown to form two different structures: NASICON and langbeinite with unusual cell parameter changes.

Type of Work:

Thesis (Doctorates > Ph.D.)

Award Type:

Doctorates > Ph.D.

Supervisor(s):