Carbon Nanotube-Templated Covalent Organic Framework Nanosheets as an Efficient Sulfur Host for Room-Temperature Metal–Sulfur Batteries,ACS Sustainable Chemistry & Engineering

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Carbon Nanotube-Templated Covalent Organic Framework Nanosheets as an Efficient Sulfur Host for Room-Temperature Metal–Sulfur Batteries
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-03-25 , DOI: 10.1021/acssuschemeng.0c00239
Ruth Gomes ₁ , Aninda J. Bhattacharyya ₁

Affiliation

We report here a versatile sulfur host, triazine-functionalized crystalline covalent organic framework nanosheets over end-opened multiwalled carbon nanotubes (CNT-CON), for room-temperature metal (viz., Li and Na)–sulfur rechargeable batteries. The CNT-CON, designed using strategies at a molecular level, accommodates nearly 78% sulfur (CNT-CON/S: cathode) and exhibits stable high capacities when cycled against lithium as well as sodium at room temperature. The battery cycling performance of CNT-CON/S is observed to be far superior compared to the bare covalent organic framework with sulfur (COF/S) and bare CNT loaded with sulfur (CNT/S). Systematic experimental and theoretical studies highlight the importance of the chemical design of the host and its influence on the battery performance. The superior battery performance of CNT-CON is a synergistic effect of the trapping mechanisms of CNT and CON. The CNT predominantly confines the nonpolar sulfur, whereas the polar polysulfides are chemically trapped by specific chemical entities in the CON framework.

中文翻译：

碳纳米管模板化的共价有机框架纳米片作为室温金属-硫电池的有效硫主体

我们在这里报告了一种多功能的硫主体，三嗪官能化的晶体共价有机骨架纳米片，该碳纳米粒子在端开的多壁碳纳米管（CNT-CON）上用于室温金属（即Li和Na）-硫可充电电池。使用分子水平策略设计的CNT-CON可以容纳将近78％的硫（CNT-CON / S：阴极），并且在室温下与锂和钠循环时表现出稳定的高容量。与含硫的裸共价有机骨架（COF / S）和含硫的裸CNT（CNT / S）相比，发现CNT-CON / S的电池循环性能要优越得多。系统的实验和理论研究强调了主机化学设计的重要性及其对电池性能的影响。CNT-CON的优异电池性能是CNT和CON的捕获机制的协同效应。CNT主要限制了非极性硫，而极性多硫化物则被CON骨架中的特定化学实体化学捕获。

更新日期：2020-04-23

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