Preparation, crystallization features and electro-magnetic properties of phosphate based glass-ceramics as solid electrolyte for lithium-ion batteries

摘要

In the present study, the effect of Fe2O3/Al2O3 replacement on the crystallization characteristics of lithium aluminum phosphate glasses with a new composition of 12Li(2)O-(18-X) Al2O3-X Fe2O3-70 P2O5 (X = 0, 9 and 18 mol%) was investigated. The strength of glasses structure were decreased with incorporation of iron into the glass network instead of aluminum; this is evident from reduce the glass transition temperature, T-g, of the specimens. X-ray diffraction patterns evidenced the formation of Al(PO3)(3), ALPO(4), (Al-0.5, Fe-0.5)(PO3)(3), and LiFe(P3O9) phases after the controlled heat-treatment process. It also showed that the Al(PO3)(3) crystal structure can accept considerable amount of iron to form aluminum iron metaphosphate solid solution. A significant decrease in the grain microstructure of the glass-ceramics was observed as Al2O3 replaced by Fe(2)O(3)in the glasses. The magnetic properties of the prepared glass-ceramics were determined at the room temperature by using vibrating sample magnetometer (VSM). The magnetic hysteresis loops of the crystallized glasses have paramagnetic behavior, and their magnetic parameters were dramatically improved by adding of Fe2O3 instead of Al2O3. The evolution of electrical properties in glass-ceramic as a function of Fe2O3/Al2O3 ratio was correlated with the type and size of the phases formed. The substitution of Al2O3 by Fe2O3 resulted in improving the conductivity of the glass-ceramics. The results gave excellent indications for use the prepared glass-ceramic as solid electrolyte materials.