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Lithium n‐Doped Polyaniline as a High‐Performance Electroactive Material for Rechargeable Batteries
Author(s) -
Jiménez Pablo,
Levillain Eric,
Alévêque Olivier,
Guyomard Dominique,
Lestriez Bernard,
Gaubicher Joël
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201607820
Subject(s) - polyaniline , lithium (medication) , faraday efficiency , electrochemistry , electrolyte , x ray photoelectron spectroscopy , redox , inorganic chemistry , chemistry , materials science , chemical engineering , electrode , organic chemistry , polymer , polymerization , medicine , engineering , endocrinology
The discovery of conducting lithium‐doped polyaniline with reversible redox chemistry allows simultaneous unprecedented capacity and stability in a non‐aqueous Li battery. This compound (lithium emeraldinate) was synthesized by lithium–proton exchange on the emeraldine base in an anhydrous lithium‐based electrolyte. A combination of UV/Vis‐NIR spectroelectrochemistry, XPS, FTIR, and EQCM characterization allowed a unified description of the chemical and electrochemical behavior, showing facile charge delocalization of the doped states and the reversibility of the redox processes in this form of polyaniline. From a practical point of view, lithium emeraldinate behaves as a high‐capacity organic active material (230 mAh g −1 ) that enables preparation of relatively thick composite electrodes with a low amount of carbon additives and high energy density (460 Wh kg −1 ). Concomitantly, at 1 C rate, 400 cycles were achieved without significant capacity loss, while the coulombic efficiency is greater than 99 %.