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Organic Thiocarboxylate Electrodes for a Room‐Temperature Sodium‐Ion Battery Delivering an Ultrahigh Capacity
Author(s) -
Zhao Hongyang,
Wang Jianwei,
Zheng Yuheng,
Li Ju,
Han Xiaogang,
He Gang,
Du Yaping
Publication year - 2017
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.201708960
Subject(s) - carboxylate , battery (electricity) , sodium , sodium ion battery , electrochemistry , electrode , carbon fibers , delocalized electron , anode , ion , sulfur , inorganic chemistry , chemistry , current density , organic radical battery , materials science , organic chemistry , power (physics) , physics , faraday efficiency , quantum mechanics , composite number , composite material
Organic room‐temperature sodium‐ion battery electrodes with carboxylate and carbonyl groups have been widely studied. Herein, for the first time, we report a family of sodium‐ion battery electrodes obtained by replacing stepwise the oxygen atoms with sulfur atoms in the carboxylate groups of sodium terephthalate which improves electron delocalization, electrical conductivity and sodium uptake capacity. The versatile strategy based on molecular engineering greatly enhances the specific capacity of organic electrodes with the same carbon scaffold. By introducing two sulfur atoms to a single carboxylate scaffold, the molecular solid reaches a reversible capacity of 466 mAh g −1 at a current density of 50 mA g −1 . When four sulfur atoms are introduced, the capacity increases to 567 mAh g −1 at a current density of 50 mA g −1 , which is the highest capacity value reported for organic sodium‐ion battery anodes until now.