A redox-active conjugated microporous polymer cathode for high-performance lithium/potassium-organic batteries

Organic redox-active materials have emerged as a class of electrode materials for rechargeable batteries due to their high redox activity, low cost, structure diversity and flexibility. However, the high solubility of organic small molecules in organic electrolytes commonly leads to the fast capacit...

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Bibliographic Details
Published in:Science China. Chemistry 2021, Vol.64 (1), p.72-81
Main Authors: Luo, Lian-Wei, Zhang, Chong, Xiong, Peixun, Zhao, Yongbo, Ma, Wenyan, Chen, Yu, Zeng, Jing Hui, Xu, Yunhua, Jiang, Jia-Xing
Format: Article
Language:English
Subjects:
Anthraquinones
Batteries
Carbonyl groups
Carbonyls
Cathodes
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Cycles
Electrochemical analysis
Electrode materials
Electrolytes
Energy storage
Lithium-ion batteries
Nonaqueous electrolytes
Polymers
Potassium
Rechargeable batteries
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Summary:Organic redox-active materials have emerged as a class of electrode materials for rechargeable batteries due to their high redox activity, low cost, structure diversity and flexibility. However, the high solubility of organic small molecules in organic electrolytes commonly leads to the fast capacity decay with cycling. Herein, we report a redox-active conjugated microporous polymer of poly(pyrene- co -anthraquinone) (PyAq) cathode material consisting of pyrene and anthraquinone units. Benefiting from the highly cross-linked polymer structure with insoluble nature in organic electrolytes, the high surface area and the plentiful redox-active carbonyl groups, the PyAq cathode demonstrates outstanding electrochemical performances for both lithium-ion batteries (LIBs) and potassium-ion batteries (KIBs). Specifically, the PyAq cathode for LIBs delivers a high reversible capacity of 169 mAh g −1 at the current density of 20 mA g −1 , a high rate capability (142 mAh g −1 at 1000 mA g −1 ) and an excellent cycling stability for 4000 cycles. Additionally, the PyAq cathode for KIBs also exhibits a high reversible capacity of 143 mAh g −1 with a long cycling life over 800 cycles. The excellent electrochemical performance demonstrates that the newly developed PyAq could be an attractive cathode material for the advanced energy storage technologies.
ISSN:1674-7291
1869-1870
DOI:10.1007/s11426-020-9871-8