Electrochemical and physical characterization of lithium ionic salt doped polyaniline as a polymer electrode of lithium secondary battery

摘要

Polyaniline films doped with lithium ionic saltssuch as LiPF_6 and LiBF_4 were prepared by using theelctrolytesolution mixture of ethylene carbonate and dimethyl carbonate.The doping level of the polyaniline films was confirmed by X-rayphotoelectron spectroscopy and dc conductivity experiments. Adoping mechanism of lithium ion through the interaction with anitrogen at imine site is proposed. Electrochemical cells ofLi//polyaniline-LiPF_6 or Li//polyaniline-LiBF_4 wereassembled to investigate electrical capacity and its trends over therepeated charge/ discharge cycles. The capacity of Li//polyanilinecell was increased and then saturated over 15 cycles. However, itdid not reach the half of theoretical capacity of polyanilinematerial. The mechanism of electrochemical reaction duringcharge/ discharge process of Li//polyaniline cell is presented.