多硫化物
分离器(采油)
材料科学
化学工程
电解质
聚合物
多孔性
催化作用
共轭体系
动力学
纳米技术
电极
化学
有机化学
物理化学
复合材料
工程类
物理
热力学
量子力学
作者
Xin Guan,Yajun Zhao,Huijie Pei,Maoji Zhao,Yong Wang,Xingping Zhou,Mohamed Gamal Mohamed,Shiao‐Wei Kuo,Yunsheng Ye
标识
DOI:10.1016/j.cej.2023.144733
摘要
The severe shuttling of soluble polysulfides (LiPSs) (Li2Sx, 4 ≤ x ≤ 8) and sluggish kinetics of solid–solid conversion (Li2S2 → Li2S), lead to the premature end of discharge, resulting in fast capacity decay, limiting the practical performance and safety of lithium-sulfur batteries (LSBs). Functional modifiers on separators exhibit significant performances in migrating diffusion and promoting conversion for LiPSs; thus, endowing the separator with multiple high-performance parameters by multifactorial engineering to address the two issues mentioned above is an urgent need. Herein, for the first time, an ultra-light (≈0.14 mg cm−2) and multifunctional modifier consisting of metalloporphyrin conjugated porous polymer (Al-CPP) is interface-induced growth on the commercial separator to develop advanced LSBs. The electrocatalyst of metalloporphyrin is covalently constructed by an imidazolium-containing linker with bis(trifluoromethane)sulfonimide (TFSI−) anions within the porous skeleton, improving diffusion and conversion of LiPSs as well as facilitating electrolyte accessibility and Li+ transport, thereby performing enhanced full-range sulfur redox kinetics, and guiding uniform Li deposition. The in-situ growth of metalloporphyrin conjugated porous polymer is further verified in LSBs that realize superior rate performances and long lifespans. This contribution proposes an efficient in-situ growth of an ultra-light modifier design strategy to functionalize separators and inspires multi-function synergetic integration facing high-performance LSBs.
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