Affiliation:
1. Key Laboratory of Synthetic and Self‐Assembly Chemistry for Organic Functional Molecules Shanghai Institute of Organic Chemistry University of Chinese Academy of Sciences Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 P. R. China
Abstract
AbstractHalogens, especially Br2 and I2, as cathode materials for lithium‐ion batteries exhibit high energy density with low cost, but poor cycling performance due to their high solubility in electrolyte solution. Herein, viologen‐based cationic porous organic polymers (TpVXs, X = Cl, Br, or I) with abundant pores and ionic redox‐active moieties are designed to immobilize halogen anions stoichiometrically. TpVBr and TpVI electrodes exhibit high initial specific capacity (116 and 132 mAh g−1 at 0.2 C) and high average discharge voltage (≈3.0 V) without any host materials. Notably, benefiting from the porous and ionic structure, TpVBr and TpVI present excellent long‐term cycling stability (86% and 98% capacity retention after 600 cycles at 0.5 C), which are far superior to those of the state‐of‐the‐art halogen electrodes. In addition, the charge storage mechanism is investigated by in situ Raman and ex situ X‐ray photoelectron spectroscopy.
Funder
National Science Fund for Distinguished Young Scholars
National Natural Science Foundation of China
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
8 articles.
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