A Microporous Covalent-Organic Framework with Abundant Accessible Carbonyl Groups for Lithium-Ion Batteries

作者：Luo, Zhiqiang; Liu, Luojia; Ning, Jiaxin; Lei, Kaixiang; Lu, Yong; Li, Fujun^*; Chen, Jun

来源：Angewandte Chemie - International Edition, 2018, 57(30): 9443-9446.

DOI：10.1002/anie.201805540

• carbonyl groups
• covalent-organic frameworks
• lithium-ion batteries
• micropores
• organic cathodes

A key challenge faced by organic electrodes is how to promote the redox reactions of functional groups to achieve high specific capacity and rate performance. Here, we report a two-dimensional (2D) microporous covalent-organic framework (COF), poly(imide-benzoquinone), via insitu polymerization on graphene (PIBN-G) to function as a cathode material for lithium-ion batteries (LIBs). Such a structure favors charge transfer from graphene to PIBN and full access of both electrons and Li+ ions to the abundant redox-active carbonyl groups, which are essential for battery reactions. This enables large reversible specific capacities of 271.0 and 193.1 mAh g(-1) at 0.1 and 10 C, respectively, and retention of more than 86% after 300 cycles. The discharging/charging process successively involves 8 Li+ and 2 Li+ in the carbonyl groups of the respective imide and quinone groups. The structural merits of PIBN-G will trigger more investigations into the designable and versatile COFs for electrochemistry.

• 出版日期2018-7-20
• 单位南开大学