期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 591, 期 -, 页码 264-272出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.02.010
关键词
Cationic covalent organic frameworks; Cathodes; Lithium-sulfur batteries; Post-functionalization; Quaternary ammonium salt
资金
- National Natural Science Foundation of China [52063014, 51873053, 21975058]
- Taishan Scholars Program [tsqn201909087]
- Qingchuang Technology Support Program [2020KJC002]
In this study, a cationic mesoporous COF (COF-NI) was synthesized and utilized as matrix framework for high-speed capacity and long-term stability in Li-S batteries. Experimental results showed that COF-NI effectively suppressed the shuttle effect of lithium polysulfide species, exhibiting better cycle stability compared to neutral COF-Bu.
Covalent organic frameworks (COFs) with pre-designed structure and customized properties have been employed as sulfur storage materials for lithium-sulfur (Li-S) batteries. In this work, a cationic mesoporous COF (COF-NI) was synthesized by grafting a quaternary ammonium salt group onto the pore channel of COFs via a one-pot three components tandem reaction strategy. The post-functionalized COFs were utilized as the matrix framework to successfully construct the Li-S battery with high-speed capacity and long-term stability. The experimental results showed that, after loading active material sulfur, cationic COF-NI effectively suppressed the shuttle effect of the intermediate lithium polysulfide species in Li-S batteries, and exhibited better cycle stability than the as-obtained neutral COF (COF-Bu). For example, compared with COF-Bu based sulfur cathode (521 mA h g(-1)), the cationic COF-NI based sulfur cathode maintained a discharge capacity of 758 mA h g(-1) after 100 cycles. These results clearly showed that appropriate pore environment of COFs can be prepared by rational design, which can reduce the shuttle effect of lithium polysulfide species and improve the performance of Li-S battery. (C) 2021 Elsevier Inc. All rights reserved.
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