Characterization of a Phosphate Doped Spinel Oxide / PANI Nano-composite for High Power Batteries.

Reference Presenter Authors
06-065 Renier Arabolla Rodríguez Rodríguez, R.A.(Instituto de Ciencia y Tecnología de los Materiales); Hidalgo, J.C.(Instituto de Ciencias y Tecnologías Avanzadas); Martínez, M.G.(Instituto Politécnico Nacional); Cano, A.(Instituto Politécnico Nacional); Laffita, Y.M.(Instituto de Ciencia y Tecnología de los Materiales); Cappe, E.P.(Instituto de Ciencia y Tecnología de los Materiales); Mohalem, N.D.(Universidad Federal de Minas Gerais); Frutis, M.A.(Instituto Politécnico Nacional); Mojeno, A.E.(Instituto de Ciencia y Tecnología de los Materiales);

The development of high power cells for using in electric cars, smartphones and so one; is a major challenge in current researches. In this sense, high ionic-electronic conductors with redox properties need to be obtained and one of the best strategies to do that is the combination of electronic conductive polymers and nanometric ionic conductors. Lithium manganese oxides doped with phosphate ions proved to be successful in high power cell because the phosphate ions provide stability to the structure and in nanometricmaterials; they proved to increase dramatically the DLi+ (DLi+» 10-8 cm2/s). HCl-doppedpolyaniline is an excellent electronic conductor polymer which also exhibits redox properties. This work has to do with the characterization of a nanoparticulated oxide covered by HCl-polyaniline to be employed in high power electrochemical devices. HRTEM was used to study the polymer covering on nanoparticles of phosphate doped oxide while techniques like UV-Vis, ATR, magnetic susceptibility and XPS were used to determine the chemical-physical interaction between both components in the composite as well as their chemical state. By using these techniques it was possible to observe that during the synthesis of the composite a highly oxidized polymer is obtained in order to maintain the chemical potential across the oxide-polymer interphase. Electrical measurements showed a huge value of the carrier mobility in the composite with respect to the oxide and the polymer, which enable the composite to exhibit a suitable Hall conductivity sH= 3.10-3S/cm for using in fast devices. The great Li+ ion diffusion in the phosphate doped oxide as well as its great electronic conductivity leads the composite to show superior electrochemical performance with respect to the pristine materials.