Charge transport and applications to the secondary batteries of lithium salt doped polyaniline

We report the results of temperature dependence of de conductivity [sigma(d c)(T)], the electron paramagnetic resonance (EPR), and the thermoelectric p ower, as well as X-ray photoelectron spectroscopy (XPS) experiments, for po lyaniline samples (PANs) doped with various Li sails such as LiPF6, LiBF4, LiAsF6, LiCF3SO3, and LiClO4. Similar to protonic acid doped polyaniline (P AN-ES) samples, a quasi one dimensional variable range hopping (quasi-1D VR H) model provided the best fitting for the sigma(dc)(T) of the Li salt dope d PAN samples. The temperature dependence of sigma(dc)(T) varied with the k inds and the doping levels of the Li salts used. The temperature dependence of the thermoelectric power of PAN doped with LiPF6 showed a metallic beha vior. From the EPR experiments, chi(Pauli) depended on the kinds and the do ping levels of the Li salts used. We present the variations of the sigma(dc ) and the density of states as functions of the molar concentrations of the Li salts. The results of the sigma(dc) (RT), XPS, and EPR experiments show an insulator-metal transition with increasing molar concentration of Li sa lts. The results of the XPS experiment, are discussed tc, account, for the doping procedure of the systems.