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A Redox‐Active 2D Metal–Organic Framework for Efficient Lithium Storage with Extraordinary High Capacity
Author(s) -
Jiang Qiang,
Xiong Peixun,
Liu Jingjuan,
Xie Zhen,
Wang Qinchao,
Yang XiaoQing,
Hu Enyuan,
Cao Yu,
Sun Jie,
Xu Yunhua,
Chen Long
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201914395
Subject(s) - redox , electrochemistry , cathode , lithium (medication) , copper , battery (electricity) , chemistry , chemical engineering , energy storage , lithium ion battery , inorganic chemistry , materials science , electrode , organic chemistry , medicine , power (physics) , physics , quantum mechanics , engineering , endocrinology
Metal–organic framework cathodes usually exhibit low capacity and poor electrochemical performance for Li‐ion storage owing to intrinsic low conductivity and inferior redox activity. Now a redox‐active 2D copper–benzoquinoid (Cu‐THQ) MOF has been synthesized by a simple solvothermal method. The abundant porosity and intrinsic redox character endow the 2D Cu‐THQ MOF with promising electrochemical activity. Superior performance is achieved as a Li‐ion battery cathode with a high reversible capacity (387 mA h g −1 ), large specific energy density (775 Wh kg −1 ), and good cycling stability. The reaction mechanism is unveiled by comprehensive spectroscopic techniques: a three‐electron redox reaction per coordination unit and one‐electron redox reaction per copper ion mechanism is demonstrated. This elucidatory understanding sheds new light on future rational design of high‐performance MOF‐based cathode materials for efficient energy storage and conversion.