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Redistribution of Li-ions using covalent organic frameworks towards dendrite-free lithium anodes:a mechanism based on a Galton Board

查看全文 作　　者：Huanyu [1]Xie;Qing [2]Hao;Hongchang [1]Jin;Shuai [1]Xie;Zhaowei [1]Sun;Yadong [1]Ye;Chaohui [1]Zhang;Dong [2]Wang;Hengxing [1]Ji;Li-Jun [1,2]Wan 高影响力作者 机构地区：[1]Hefei National Laboratory for Physical Sciences at the Microscale,CAS Key Laboratory of Materials for Energy Conversion,Department of Applied Chemistry,University of Science and Technology of China,Hefei 230026,China;[2]CAS Key Laboratory of Molecular Nanostructure and Nanotechnology,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China高影响力机构 出　　处：《Science China Chemistry》索引2020年第63卷第9期,共9页高影响力期刊 基　　金：the Natural Science Foundation of China(51761145046;21975243);the 100 Talents Program of the Chinese Academy of Sciences;National Program for Support of Topnotch Young Professional;and i Ch EM。 摘　　要：Because of its high theoretical specific capacity and low reduction potential,Li metal is considered to be key to reaching high energy density in rechargeable batteries.In this context,most of the research has focused on suppressing dendrite formation during Li deposition to improve the cycling reversibility and safety of the batteries.Here,covalent organic framework(COF)film coating on a commercial polypropylene separator is applied as an ion redistributor to eliminate Li dendrites.The COF crystallites consist of ordered nanochannels that hinder the movement of anions while allowing Li-ions to transport across,leading to a high Li-ion transference number of 0.77±0.01.The transport of Li-ions across the COF film can be considered to be analogous to beads passing through a Galton Board,a model that demonstrates a statistical concept of a normal distribution.Thus,an even distribution of Li-ions is obtained at the COF/Li metal interface.The controlled Li-ion flux yields a smooth Li metal surface after 1,000 h(500 times)of cycling,leading to a significantly improved cycling stability and reversibility,as demonstrated by Cu||Li half cells,Li||Li symmetric cells,and Li Fe PO4||Li full cells.These results suggest that,following the principle of a Galton Board,nanopore insulators such as COF-based materials are effective ion distributors for the different energy storage or conversion systems. 关 键 词：REDISTRIBUTION dendrite-free lithium metal anode COFs Galton Board
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