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A Sulfur Heterocyclic Quinone Cathode and a Multifunctional Binder for a High‐Performance Rechargeable Lithium‐Ion Battery
Author(s) -
Ma Ting,
Zhao Qing,
Wang Jianbin,
Pan Zeng,
Chen Jun
Publication year - 2016
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.201601119
Subject(s) - cathode , lithium (medication) , electrochemistry , battery (electricity) , homo/lumo , materials science , ion , chemistry , organic radical battery , dissolution , molecule , quinone , chemical engineering , inorganic chemistry , electrode , organic chemistry , medicine , power (physics) , physics , quantum mechanics , engineering , endocrinology
We report a rational design of a sulfur heterocyclic quinone (dibenzo[b,i]thianthrene‐5,7,12,14‐tetraone=DTT) used as a cathode (uptake of four lithium ions to form Li 4 DTT) and a conductive polymer [poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate)=PEDOT:PSS) used as a binder for a high‐performance rechargeable lithium‐ion battery. Because of the reduced energy level of the lowest unoccupied molecular orbital (LUMO) caused by the introduced S atoms, the initial Li‐ion intercalation potential of DTT is 2.89 V, which is 0.3 V higher than that of its carbon analog. Meanwhile, there is a noncovalent interaction between DTT and PEDOT:PSS, which remarkably suppressed the dissolution and enhanced the conductivity of DTT, thus leading to the great improvement of the electrochemical performance. The DTT cathode with the PEDOT:PSS binder displays a long‐term cycling stability (292 mAh g −1 for the first cycle, 266 mAh g −1 after 200 cycles at 0.1 C) and a high rate capability (220 mAh g −1 at 1 C). This design strategy based on a noncovalent interaction is very effective for the application of small organic molecules as the cathode of rechargeable lithium‐ion batteries.