Poly[bis(2-aminophenyloxy)disulfide]:A polyaniline derivative containing disulfide bonds as a cathode material for lithium battery

摘要

A new conductive polyaniline derivative containing disulfide bonds,poly[bis(2-aminophenyloxy)disulfide] (PAPOD),has been proposed as a high energy-storage material.PAPOD has been synthesized using a moderate oxidant ferric chloride and characterized by elemental analysis,X-ray photoelectron spectroscopy (XPS),FT-IR,FT-Raman,and UV-vis spectroscopy.The cyclic voltarnmograrns of this polymer show that the intramolecular self-catalysis occurs between the conductive main-chain polyaniline (doping/undoping processes of the pi-conjugated system) and side-chain disulfide bonds (scission/reformation processes of the S-S bonds) in PAPOD.Because the redox reaction of conductive main-chain polyaniline occurs in the same potential range as that of the side-chain disulfide bonds of this polymer,the Li/PAPOD test cell displays a charge capacity of 230 mAh g~(-1)-cathode and an energy density of 460 mWh g~(-1)-cathode,which is about 2-3 times higher than those of inorganic intercalation compounds.