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In Situ Electropolymerization Enables Ultrafast Long Cycle Life and High‐Voltage Organic Cathodes for Lithium Batteries
Author(s) -
Zhao Chen,
Chen Zifeng,
Wang Wei,
Xiong Peixun,
Li Benfang,
Li Mengjie,
Yang Jixing,
Xu Yunhua
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202000566
Subject(s) - materials science , triphenylamine , cathode , electrochemistry , lithium (medication) , dissolution , carbazole , electrode , battery (electricity) , nanotechnology , voltage , chemical engineering , optoelectronics , electrical engineering , chemistry , photochemistry , medicine , power (physics) , physics , quantum mechanics , endocrinology , engineering
Organic cathode materials have attracted extensive attention because of their diverse structures, facile synthesis, and environmental friendliness. However, they often suffer from insufficient cycling stability caused by the dissolution problem, poor rate performance, and low voltages. An in situ electropolymerization method was developed to stabilize and enhance organic cathodes for lithium batteries. 4,4′,4′′‐Tris(carbazol‐9‐yl)‐triphenylamine (TCTA) was employed because carbazole groups can be polymerized under an electric field and they may serve as high‐voltage redox‐active centers. The electropolymerized TCTA electrodes demonstrated excellent electrochemical performance with a high discharge voltage of 3.95 V, ultrafast rate capability of 20 A g −1 , and a long cycle life of 5000 cycles. Our findings provide a new strategy to address the dissolution issue and they explore the molecular design of organic electrode materials for use in rechargeable batteries.