Abstract

HUGUENIN, Fritz  and  TORRESI, Roberto M.. Charge transportation in polyaniline/V₂O₅ composites. Quím. Nova [online]. 2004, vol.27, n.3, pp. 393-398. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422004000300006.

In this work, composites formed from a mixture of V₂O₅ and polyaniline (PANI) were investigated, for applications as cathode materials for secondary lithium batteries. Electrochemical quartz crystal microbalance (EQCM) data show that charge compensation in the [PANI]_0.3V₂O₅ nanocomposite is achieved predominantly by Li⁺ migration. However, the charge compensation in the [PANI]V₂O₅ microcomposite occurs by Li⁺ and ClO₄^- transport. Electrochemical Impedance Spectroscopy (EIS) measurements reveal several benefits of nanohybrid formation, including the achievement of shorter ionic diffusion pathways, the higher diffusion rate of the lithium ion and also the higher electronic conductivity, which are responsible for a synergetic effect of the energy storage properties.

Keywords : nanocomposites; V₂O₅; polyaniline.