Effect of substitution by aluminum ions and heat treatment conditions on electrochemical properties of ceramics with composition Li2O-Al2O3-Fe2O3
DOI:
https://doi.org/10.15587/1729-4061.2015.38061Keywords:
spinel, cathode material, specific capacity, conductivity, lithium current sourcesAbstract
Based on X-ray diffraction, electron microscopic and electrochemical studies, a comprehensive analysis of the solid solutions of lithium ferrites and lithium aluminates in a wide concentration range, depending on the cooling conditions on the final stage of solid-phase ceramic synthesis was carried out in the paper.
It was shown that the crystal structure and microstructure formations of solid solutions of lithium ferrites and lithium aluminates at the boundary of the metastable formations allow to obtain the system, suitable for electrochemical lithium intercalation with the necessary intercalation and electron-transport characteristics. This allows to construct a chemical lithium current source with the cathodes based on the obtained systems without additional processing techniques.
The resulting current sources with an operating voltage of ~2 V are characterized by a specific charge of ~300 A•h/kg and specific energy of ~625 W•h/kg.
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