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Radical Polymer Containing a Polytriphenylamine Backbone: Its Synthesis and Electrochemical Performance as the Cathode of Lithium‐Ion Batteries
Author(s) -
Su Chang,
Yang Fang,
Xu Lihuang,
Zhu Xiaogang,
He Huihui,
Zhang Cheng
Publication year - 2015
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201402268
Subject(s) - chemistry , cyclic voltammetry , polymer , triphenylamine , electrochemistry , fourier transform infrared spectroscopy , lithium (medication) , monomer , polymerization , polymer chemistry , chemical engineering , electrode , analytical chemistry (journal) , organic chemistry , medicine , engineering , endocrinology
A novel radical monomer containing triphenylamine and the 2,2,6,6‐tetramethylpiperidinyl‐ N ‐oxy (TEMPO) radical has been synthesized. The corresponding linear homopolymer of 4‐carboxy‐ N , N ‐diphenylaniline‐2,2,6,6‐tetramethylpiperidin‐1‐yloxy (PTPA‐TEMPO) was then prepared by chemical oxidative polymerization. The chemical structure and electrochemical properties of the prepared polymers were characterized by Fourier transform infrared spectroscopy, ultraviolet–visible spectroscopy, scanning electron microscopy, cyclic voltammetry, and galvanostatic charge–discharge testing by the simulated lithium‐ion half‐cell method. The results demonstrated that the as‐synthesized functional polymers exhibited an initial discharge capacity of up to 140 mAh g −1 with two well‐defined plateaus at the potential of 3.8 and 2.7 V versus Li/Li + . Furthermore, the PTPA‐TEMPO electrode showed superior cycling and rate performances. The improved electrochemical performances were attributed to the construction of the novel linear radical molecular structure with PTPA as the conductive polymer backbone, which improved the long‐range charge‐carrier transportation and facilitated the Li + ‐ion insertion–extraction process in the aggregated polymer bulk during the charge–discharge process.