Host-guest regulations in functionalized metal and covalent organic frameworks raise the performance of lithium sulfur batteries  

作　　者：Qilin Huang Yulin Gao Jianguo Sun Binbin Liu Ximeng Liu Yuepeng Pang Yu Liu John Wang 

机构地区：[1]Department of Materials Science and Engineering,National University of Singapore,Singapore 117574,Singapore [2]ST Engineering Advanced Material Engineering Pte.Ltd.,Singapore 619523,Singapore [3]School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China [4]College of Science,Nanchang Key Laboratory of Photoelectric Conversion and Energy Storage Materials,Nanchang Institute of Technology,Nanchang 330099,China [5]National University of Singapore(Chongqing)Research Institute,Chongqing 401123,China

出　　处：《DeCarbon》2024年第2期36-52,共17页低碳科学(英⽂)

基　　金：supported by the Singapore Ministry of Education,and the National Research Foundation(NRF)for research conducted at the National University of Singapore(CRP NRF-CRP26-2021-0003).

摘　　要：Lithium sulfur batteries(LSBs)show great promise as next-generation batteries due to their high energy density.However,commercialization is hindered by limited cycle life,fast capacity decay and poor sulfur utilization,primarily due to the intricate phase evolution during battery operation and insulating characteristics of sulfur,leading to uncontrollable sulfur and polysulfide distribution and inefficient conversion kinetics.Therefore,the incorporation of metal and covalent organic frameworks(MOFs and COFs)has been widely employed in LSBs to serve as hosts,enabling the regulation of conversion and diffusion behavior of guest species,including lithium ions,sulfur and polysulfides,within their well-defined nanosized cavities.Nevertheless,pristine frameworks often fail to meet the requisite standards,and framework functionalization offers unique opportunities to tailor desired attributes and facilitate selective host-guest interactions in LSBs.However,a thorough understanding on how to precisely customize the nano-channels with functional groups to promote such interactions remains largely unexplored.In this review,we provide a systematic discussion on how the grafting of functional groups containing various active sites can play a role in host-guest chemistry,and focus on the latest advancements in engineering functionalized MOFs and COFs as charged-species regulators to tackle the problems causing poor LSB electrochemical performance.The concepts of electrophilic and nucleophilic effects are proposed,uncovering the mechanisms of framework functionalization in LSBs and serving as guidance for future developments.

关 键 词：Lithium-sulfur batteries Functionalized frameworks Host-guest chemistry Electrophilic effect Nucleophilic effect 

分 类 号：TM9[电气工程—电力电子与电力传动]