材料科学
共轭微孔聚合物
多硫化物
微型多孔材料
电子受体
聚合物
三嗪
共轭体系
接受者
化学工程
催化作用
分离器(采油)
氧化还原
电子转移
碳纳米管
锂(药物)
电解质
纳米技术
光化学
高分子化学
电极
有机化学
化学
物理化学
内分泌学
工程类
复合材料
凝聚态物理
冶金
医学
物理
热力学
作者
Tsung-Yi Huang,Gengyuan Zhang,Ruwei Chen,Shangjun Lin,Hujing Zhou,Jiangtao Li,Lai‐Hon Chung,Xuanhe Hu,Lin Yu,Jun He
标识
DOI:10.1021/acsami.3c01558
摘要
Conjugated microporous polymers (CMPs) with porous structure and rich polar units are favorable for high-performance lithium-sulfur (Li-S) batteries. However, understanding the role of building blocks in polysulfide catalytic conversion is still limited. In this work, two triazine-based CMPs are constructed by electron-accepting triazine with electron-donating triphenylbenzene (CMP-B) or electron-accepting triphenyltriazine (CMP-T), which can grow on a conductive carbon nanotube (CNT) to serve as separator modifiers for Li-S batteries. CMP-B@CNT features faster ion transportation than the counterpart of CMP-T@CNT. More importantly, compared with acceptor-acceptor (A-A) CMP-T, donor-acceptor (D-A) CMP-B possesses a higher degree of conjugation and a narrower band gap, which are conducive to the electron transfer along the polymer skeleton, thus accelerating the sulfur redox kinetics. Consequently, the CMP-B@CNT functional separator endows Li-S cells with an outstanding initial capacity of 1371 mAh g-1 at 0.1 C and favorable cycling stability with a capacity degradation rate of 0.048% per cycle at 1 C for 800 cycles. This work provides insight into the rational design of efficient catalysts for advanced Li-S batteries.
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