Effects of synthetic conditions on the structural, stability and ion conducting properties of Li0.30(La0.50Ln0.50)0.567TiO3 (Ln= La, Pr, Nd) solid electrolytes for rechargeable lithium batteries

The structure, thermal stability, morphology and ion conductivity of titanium perovskites with the general formula Li3xLn2/3−xTiO3 (Ln = rare earth element; 3x= 0.30) are studied in the context of their possible use as solid electrolyte materials for lithium ion batteries. Materials are prepared by a glycine-nitrate method using different sintering treatments, with a cation-disorder-induced structural transition from tetragonal to cubic symmetry, detected as quenching temperature increases. SEM images show that the average grain size increases with increasing sintering temperature and time. Slightly higher bulk conductivity values have been observed for quenched samples sintered at high temperature. Bulk conductivity decreases with the lanthanide ion size. A slight conductivity enhancement, always limited by grain boundaries, is observed for longer sintering times. TDX measurements of the electrolyte/cathode mixtures also show a good stability of the electrolytes in the temperature range of 30-1100ºC.

Synthesis and characterization of low-cost materials for aqueous Na-ion batteries

136 p.

LDM teknologiaren errendimenduaren azterketa multicast zerbitzuetarako

[EN]The purpose of this project is to study the performance and the efficiency of the LDM technology for the transmission of multicast services in a cellular network and vehicular communication environment. In order to achieve this goal, it will be done a comparison with LTE, the technology nowadays used for multicast-grouping techniques. Thus, the specific parameters of each technology are going to be analyzed and a simulation software is going to be developed. Finally, the results from the above mentioned comparison will be shown, as well as an implementation of LDM in multicast-grouping technique.