期刊
NANO ENERGY
卷 70, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2020.104498
关键词
Lithium-ion batteries; Organic cathode; Covalent organic frameworks; High capacity; Cycle and rate performance
类别
资金
- Ministry of Science and Technology of China (MoST) [2016YFA0200200]
- National Natural Science Foundation of China (NSFC) of China [21421001, 51633002]
- 111 Project [B12015]
- [16ZXCLGX00100]
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 0.05C, 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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据