Effect of MnO/PP separator on morphologies of Li metal deposition  

MnO/PP隔膜对锂金属沉积形貌的影响

作　　者：YAN Jun 闫俊(中北大学出版中心,山西太原030051;北京师范大学化学学院能量转换与存储材料北京市重点实验室,北京100875)

机构地区：[1]Publishing Center,North University of China,Taiyuan 030051,China [2]Beijing Key Laboratory of Energy Conversion and Storage Materials,College of Chemistry,Beijing Normal University,Beijing 100875,China

出　　处：《Journal of Measurement Science and Instrumentation》2025年第1期154-160,共7页测试科学与仪器(英文版)

摘　　要：The application of lithium metal anodes is hindered by low Coulombic efficiency(CE),serious lithium dendrites and volume expansion.An MnO/Polypropylene(PP)composite separator was developed to regulate lithium metal deposition behaviors through in situ forming stable artificial solid electrolyte interface(SEI)passivating layers.The concentration of MnO in the cells can be maintained at a constant based on quite low solubility of MnO in the liquid electrolyte,and the dissolved MnO can be reduced to produce Li_(2)O and Mn metal nanoparticles,which can not only function as nucleating seeds of lithium metal deposits but also repair the broken SEI layer.Dendritic-free Li deposits can be obtained by simple separator coating.It can also improve the electrochemical performance of lithium metal batteries.And it is benefit for applications of Li metal anodes.低的库伦效率、严重的枝晶生长和体积膨胀限制了锂金属负极的应用。本文提出了一种MnO/聚丙烯(PP)复合隔膜,可以通过原位形成稳定的固态电解质界面(Solid electrolyte interface,SEI)层调控锂金属的沉积行为。由于MnO微溶于有机液态电解质,其可在电池中保持恒定浓度,同时,溶出的MnO可以被还原成Li_(2)O和Mn。还原产物不仅可作为锂金属沉积的成核剂,还可以修复破裂的SEI层。通过简单的隔膜涂覆可以获得无枝晶的锂沉积,还可以提升锂金属电池的电化学性能,有助于促进锂金属负极的应用。

关 键 词：Li metal anode MnO/PP composite separator MORPHOLOGY solid electrolyte interface(SEI) 

分 类 号：TM9[电气工程—电力电子与电力传动]