化学工程
分离器(采油)
多硫化物
硫黄
微型多孔材料
材料科学
吸附
电解质
共价有机骨架
阴极
共价键
两亲性
化学
纳米技术
有机化学
电极
聚合物
共聚物
工程类
物理化学
物理
热力学
作者
Chuanguang Wu,Xiaorong Yan,Haiping Yu,Jiakui Xiong,Hao Zhang,Tengfei Li,Guoqing Zhao,Guangcun Shan,Jinzhang Liu,Mingjun Hu,Jun Jiang Luo,Jun Yang
出处
期刊:Small
[Wiley]
日期:2024-09-17
标识
DOI:10.1002/smll.202403258
摘要
Abstract Inhibiting the shuttle of polysulfides is of great significance for promoting the practical application of lithium–sulfur batteries (LSBs). Here, an imine‐linked covalent organic framework@carbon nanotube (COF@CNT) interlayer composed of triazine and boroxine rings is constructed between the sulfur cathode and the separator for polysulfides reception and reutilization. The introduction of CNT imparts the conductor characteristic to the interlayer attributed to electron tunneling in thin COF shell, and creates a hierarchical porous architecture for accommodating polysulfides. The uniform distribution of amphiphilic adsorption sites in COF microporous structure not only enables efficient entrapment of polysulfides while allowing the penetration of Li + ions, but also provides a stable electrocatalytic channel for bidirectional conversion of active sulfur to achieve the substantially improved capacity and stability. The interlayer‐incorporated LSBs deliver an ultrahigh capacity of 1446 mA g −1 at 0.1C and an ultralow capacity decay rate of 0.019% at 1C over 1500 cycles. Even at an electrolyte/sulfur ratio of 6 µL mg −1 , an outstanding capacity of 995 mAh g −1 and capacity retention of 74.1% over 200 cycles at 0.2C are obtained. This work offers a compelling polysulfides entrapment and reactivation strategy for stimulating the study on ultra‐stable LSBs.
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