Anisotropically Hybridized Porous Crystalline Li-S Battery Separators
Anisotropically Hybridized Porous Crystalline Li-S Battery Separators
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各向异性杂化多孔晶体锂硫电池隔膜
DOI：
10.1002/smll.202206616
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发表时间：
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期刊：
影响因子：
13.3
通讯作者：
Ya‐Qian Lan
中科院分区：
文献类型：
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作者：
Yuluan Zhang;Can Guo;Jie Zhou;Xiaoman Yao;Jie Li;Huifen Zhuang;Yuting Chen;Yifa Chen;Shun‐Li Li;Ya‐Qian Lan
基于多孔晶体材料的各向异性杂化多孔晶体Li - S电池隔膜能够同时满足阳极和阴极的多种功能，是Li - S电池非常需要的，但在定向设计方面仍然具有挑战性。本文报道了一种基于离子液体修饰的卟啉共价有机骨架（COF - 366 - OH - IL）和催化活性金属有机骨架（Ni3(HITP)2）的各向异性杂化分离器（CPM），它可以将锂多硫化物（LiPSs）的吸附/催化转化和离子传导位点整合在一起，以定向满足电极的要求。值得注意的是，该隔膜具有非常高的Li+转移数（tLi+= 0.8）、超低极化电压（<30 mV）、高初始比容量（921.38 mAh g - 1at 1 C）和稳定的循环性能，远远优于聚丙烯和单层改性隔膜。此外，理论计算证实了CPM在阳极侧（例如Li+转移、LiPSs吸附和阳极保护）和阴极侧（例如LiPSs吸附/催化）的各向异性效应。本研究为分离剂的研究提供了新的思路。
Anisotropically hybridized porous crystalline Li‐S battery separators based on porous crystalline materials that can meet the multiple functionalities of both anodic and cathodic sides are much desired for Li‐S battery yet still challenging in directional design. Here, an anisotropically hybridized separator (CPM) based on an ionic liquid‐modified porphyrin‐based covalent‐organic framework (COF‐366‐OH‐IL) and catalytically active metal‐organic framework (Ni3(HITP)2) that can integrate the lithium‐polysulfides (LiPSs) adsorption/catalytic conversion and ion‐conduction sites together to directionally meet the requirements of electrodes is reported. Remarkably, the‐obtained separator exhibits an exceptional high Li+transference‐number (tLi+= 0.8), ultralow polarization‐voltage (<30 mV), high initial specific‐capacity (921.38 mAh g−1at 1 C), and stable cycling‐performance, much superior to polypropylene and monolayer‐modified separators. Moreover, theoretical calculations confirm the anisotropic effect of CPM on the anodic side (e.g., Li+transfer, LiPSs adsorption, and anode‐protection) and cathodic side (e.g., LiPSs adsorption/catalysis). This work might provide a new perspective for separator exploration.