Metal-organic nanosheet assembly ions sieving membrane for precise lithium ion and anion/solvent separation toward robust lithium metal battery  

作　　者：Jian-Qiang Shen Tian-Tian Zhao Ying-Li Song Lingjuan Zhang Ya-Nan Gao Xiao-Nan Cui Peng Zhao Xian-Ming Zhang 

机构地区：[1]Key Laboratory of Magnetic Molecules&Magnetic Information Materials,Ministry of Education,School of Chemistry&Material Science,Shanxi Normal University,Taiyuan 030031,China [2]College of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan 030024,China

出　　处：《Science China Chemistry》2024年第10期3320-3327,共8页中国科学（化学英文版）

基　　金：the financial support of the Natural Science Foundation of Shanxi Province(20210302124055);the National Natural Science Foundation of China(22301170,22271211 and 91961201);1331 Project of Shanxi Province。

摘　　要：Metal-organic nanosheets(MONs)as a novel material with tunable pore structures and low mass transfer resistance,have emerged as molecular sieves for the separation of gases and liquids.In theory,they can also serve as ion sieves for lithium metal batteries(LMBs),realizing the high-energy and dendritic free LMBs.However,there are rarely relevant reports,because it is difficult to simultaneously balance efficient ion sieving ability,high ion passing rate and high electrochemical stability.Here,we synthesized a stable ultrathin MON[Zn_(2)(Bim)_(4)]([Zn_(2)(Bim)_(4)]Nanosheet,HBim=benzimidazolate),which can achieve both efficient lithium ion sieving ability,high lithium ion passing rate and high electrochemical stability at the same time.The separator assembled by this MON exhibits high Li^(+)transfer number of 0.81 due to the accurate lithium ion and anion/solvent separation.The battery containing such separator shows high lithium ionic conductivity of 0.74 m S cm^(-1)and low activation energy of 0.099 eV,which can be attributed to the nanometer level thickness and the ion sieving effect.What is more,we realized the application of MONs-based ion sieves in LMBs with intercalation cathodes for the first time.And the LiFePO_(4)|Li battery with as-assembled separator demonstrates improved Coulombic efficiency(>99%)and significantly extended cycling life(>1600 cycles)with 80%capacity retention.

关 键 词：lithium sieving membrane metal-organic nanosheets lithium metal battery lithium ion and anion separation lithium ion and solvent separation 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]