Affiliation:
1. Department of Chemical Engineering School of Environmental and Chemical Engineering Shanghai University 99 Shangda Road 200444 Shanghai P. R. China
2. College of Chemical and Material Engineering Zhejiang A&F University 666 Wusu Street 311300 Hangzhou Zhejiang P. R. China
3. Key Laboratory of Organic Compound Pollution Control Engineering Ministry of Education Shanghai University 99 Shangda Road 200444 Shanghai P. R. China
4. Institute of New Energy School of Chemistry and Chemical Engineering Shaoxing University 900 Chengnan Avenue 312000 Shaoxing Zhejiang P. R. China
Abstract
AbstractGreen organic materials composed of C, H, O, and N elements are receiving more and more attention worldwide. However, the high solubility, poor electrical conductivity, and long activation time limit the development of organic materials in practice. Herein, two stable covalent organic materials with alkynyl linkage between benzene rings and benzothiadiazole groups with different amounts of fluorine atoms modification (defined as BOP‐0F and BOP‐2F), are designed for lithium‐ion batteries. Both BOP‐0F and BOP‐2F can achieve superior reversible capacities of ≈719.8 and 713.5 mAh g−1 over 100 cycles on account of the redox activity of alkynyl (two‐electron involved) and benzothiadiazole units (five‐electron involved) in these organic materials. While BOP‐2F electrodes exhibit much more stable cycling performance than BOP‐0F electrodes, especially without pronounced capacity ascending during initial cycling. It can be assigned to the synergy effect of alkynyl linkage and fluorine atom modification in BOP‐2F. The lithium storage and activation mechanism of alkynyl, benzothiadiazole, and fluorine groups have also been deeply probed by a series of material characterizations and theoretical simulations. This work could be noteworthy in providing novel tactics for the molecular design and investigation of high‐efficiency organic electrodes for energy storage.
Funder
National Natural Science Foundation of China
Innovative Research Team of High-level Local University in Shanghai
Subject
General Chemistry,Catalysis