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Core–Shell‐Structured CNT@RuO 2 Composite as a High‐Performance Cathode Catalyst for Rechargeable Li–O 2 Batteries
Author(s) -
Jian Zelang,
Liu Pan,
Li Fujun,
He Ping,
Guo Xianwei,
Chen Mingwei,
Zhou Haoshen
Publication year - 2014
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.201307976
Subject(s) - composite number , cathode , materials science , battery (electricity) , catalysis , polarization (electrochemistry) , chemical engineering , electrode , core (optical fiber) , composite material , nanotechnology , chemistry , power (physics) , physics , biochemistry , engineering , quantum mechanics
A RuO 2 shell was uniformly coated on the surface of core CNTs by a simple sol–gel method, and the resulting composite was used as a catalyst in a rechargeable Li–O 2 battery. This core–shell structure can effectively prevent direct contact between the CNT and the discharge product Li 2 O 2 , thus avoiding or reducing the formation of Li 2 CO 3 , which can induce large polarization and lead to charge failure. The battery showed a high round‐trip efficiency (ca. 79 %), with discharge and charge overpotentials of 0.21 and 0.51 V, respectively, at a current of 100 mA g total −1 . The battery also exhibited excellent rate and cycling performance.