期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 45, 页码 54096-54105出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c18256
关键词
aqueous zinc-ion batteries; energy storage; electrochemistry; high rate; ion channels
资金
- National Natural Science Foundation of China [51822201, 21972007]
- Jian-Hua Research Foundation of Hebei University of Technology [HB1921, HB1920]
The research demonstrates the use of organic phenazine molecules with flexible electron-rich ion channels as cathode materials for aqueous zinc-ion batteries, enabling fast-charging and long-term stability. These materials exhibit excellent capacity and cycling performance, outperforming previously reported aqueous ZIBs.
Aqueous zinc-ion batteries (ZIBs) are regarded as a promising candidate for ultrafast charge storage owing to the high ionic conductivity of aqueous electrolytes and high theoretical capacity of zinc metal anodes. However, the strong electrostatic interaction between high-charge-density zinc ions and host materials generally leads to sluggish ion-transport kinetics and structural collapse of rigid cathode materials during the charge/discharge process, so searching for suitable cathode materials for ultrafast and long-term stable ZIBs remains a great challenge. Herein, flexible electron-rich ion channels enabling fast-charging and stable aqueous ZIBs have been demonstrated. Because of the nitrogen-rich conjugated structure of organic phenazine (PNZ) molecules, electron-rich ion channels are formed with the C=N redox centers situated on the channel surface, where zinc ions can transport rapidly and react with active moieties directly. Meanwhile, the pi-conjugated systems and inherent flexibility of PNZ molecules can accommodate rapid strain changes and maintain their structural stability during zinc-ion intercalation/deintercalation. Consequently, they exhibit a high capacity of 94.2 mAh g(-1) at an ultrahigh rate of 700C (208.6 A g(-1)) and an ultralong life over 100,000 cycles at 100C, which are superior to those of previously reported aqueous ZIBs. Our work presents a new way for developing ultrafast and ultrastable aqueous ZIBs.
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