A 2D covalent organic framework as a high-performance cathode material for lithium-ion batteries

• DOI: 10.1016/j.nanoen.2020.104498
• Publication Date: 2020-01-21T17:19:50Z
• Authors: Manman Wu; Yang Zhao; Binqiao Sun; Zhenhe Sun; Chenxi Li; Yu Han; Lingqun Xu; Zhen Ge; Yuxin Ren; Mingtao Zhang; Qiang Zhang; Yan Lu; Wei Wang; Yanfeng Ma; Yongsheng Chen
• Keywords: 01 natural sciences; 7. Clean energy; 0104 chemical sciences

Abstract Organic cathode materials for lithium storage have attracted wide attention owing to their very diverse structures and largely tuned engineered molecular levels. However, it remains a great challenge to design a cathode material with simultaneously combined features of high specific capacity, cycle life and rate performance. Here, based on our proposed strategy, we design and report a BQ1-COF consisting of maximum active groups (C=O and C=N) with minimal inactive groups, which when used as cathode materials for lithium-ion batteries give a reversible capacity of 502.4 mA h g-1 at 0.05 C, so far the highest capacity among polymer-based cathode materials. More importantly, the stable framework structure delivers an excellent capacity retention (81% after 1,000 cycles at 1.54 A g-1), and it is noted that the rate performance (170.7 mA h g-1 even at 7.73 A g-1) is far superior to previous related reports. These results indicate that maximizing the loading of redox active groups in a stable network structure is an effective strategy to design organic cathode materials simultaneously with high capacity and outstanding cycle and rate performance for next generation lithium-ion batteries.