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A Self‐Polymerized Nitro‐Substituted Conjugated Carbonyl Compound as High‐Performance Cathode for Lithium‐Organic Batteries
Author(s) -
Li Qiang,
Wang Haidong,
Wang Hengguo,
Si Zhenjun,
Li Chunping,
Bai Jie
Publication year - 2020
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201903112
Subject(s) - conjugated system , lithium (medication) , polymerization , cathode , nitro , redox , faraday efficiency , electrochemistry , polymer , dissolution , chemistry , materials science , electrolyte , inorganic chemistry , electrode , organic chemistry , medicine , endocrinology , alkyl
Abstract Conjugated carbonyl compounds have received much attention as cathode materials for developing green lithium‐ion batteries (LIBs). However, their high dissolution and poor electronic conductivity in organic electrolyte restrict their further application. Herein, a self‐polymerized nitro‐substituted conjugated carbonyl compound (2,7‐dinitropyrene‐4,5,9,10‐tetraone, PT‐2 NO 2 ) is applied as a high‐performance cathode material for LIBs. PT‐2 NO 2 exhibits a high reversible capacity of 153.9 mAh g −1 at 50 mA g −1 after 120 cycles, which is higher than that of other substituted compounds. Detailed characterization and theoretical calculations have testified that PT‐2 NO 2 is transformed into an azo polymer through an irreversible reductive coupling reaction in the first discharge process, and then carbonyl and azo groups reversibly react with Li ions in subsequent cycles. In addition, this azo polymer is also synthesized and applied as the electrode material, which shows similar electrochemical performance to PT‐2 NO 2 but with higher initial coulombic efficiency. Thus, this work provides a simple but effectively way to construct organic cathode materials with multiple redox sites for green and high‐performance LIBs.