A Truxenone-based Covalent Organic Framework as an All-Solid-State Lithium-Ion Battery Cathode with High Capacity

作者：Yang, Xiye; Hu, Yiming; Dunlap, Nathan; Wang, Xubo; Huang, Shaofeng; Su, Zhiping; Sharma, Sandeep; Jin, Yinghua; Huang, Fei; Wang, Xiaohui^*; Lee, Se-hee^*; Zhang, Wei^*

来源：Angewandte Chemie - International Edition, 2020, 59(46): 20385-20389.

DOI：10.1002/anie.202008619

• covalent organic frameworks
• high capacity
• lithium-ion batteries
• multiple-electron redox
• truxenone

All-solid-state lithium ion batteries (LIBs) are ideal for energy storage given their safety and long-term stability. However, there is a limited availability of viable electrode active materials. Herein, we report a truxenone-based covalent organic framework (COF-TRO) as cathode materials for all-solid-state LIBs. The high-density carbonyl groups combined with the ordered crystalline COF structure greatly facilitate lithium ion storage via reversible redox reactions. As a result, a high specific capacity of 268 mAh g(-1), almost 97.5 % of the calculated theoretical capacity was achieved. To the best of our knowledge, this is the highest capacity among all COF-based cathode materials for all-solid-state LIBs reported so far. Moreover, the excellent cycling stability (99.9 % capacity retention after 100 cycles at 0.1 C rate) shown by COF-TRO suggests such truxenone-based COFs have great potential in energy storage applications.