A Microporous Covalent–Organic Framework with Abundant Accessible Carbonyl Groups for Lithium‐Ion Batteries |
| |
Authors: | Zhiqiang Luo Luojia Liu Jiaxin Ning Kaixiang Lei Yong Lu Prof. Fujun Li Prof. Jun Chen |
| |
Affiliation: | Key Laboratory of Advanced Energy Materials Chemistry, (Ministry of Education), College of Chemistry, Nankai University, Tianjin, China |
| |
Abstract: | 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 in situ 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. |
| |
Keywords: | carbonyl groups covalent– organic frameworks lithium-ion batteries micropores organic cathodes |
|
|