离子液体基电解液与聚丙烯隔膜的兼容性研究

打开文本图片集

关键词：离子液体基电解液；锂金属电池；锂沉积行为；隔膜-电解液系统中图分类号：O646；TM912文献标志码：ADOI：10.7652/xjtuxb202507015 文章编号： 0253-987X（2025）07-0150-09

Study on the Compatibility of Ionic Liquid-Based Electrolytes with Polypropylene Separators

HE Taohong 1，2 ，ZHANG Cheng1，LIYul，HANYushan¹， ZHANG Zhicheng1，WANGJianan²，YANGHonghui' （1.School of Chemistry，Xi'an JiaotongUniversity，Xi'an 7loo49，China; 2.School of Energy andPower Engineering，Xi'an Jiaotong University，Xi’an 71oo49，China）

Abstract： This study aims to optimize the separator-electrolyte system by investigating the compatibility between ionic liquid-based electrolytes and commercial separators，thereby enhancing the performance of lithium metal batteries. Three commercial polypropylene separators （PP25Oo，PP3501， and PP2325）are selected and combined with a specific ionic liquid-based electrolyte （tributyl （methoxymethyl） phosphonium hexafluorophosphate， [P444101][PF6]） to construct different separator-electrolyte systems. The lithium-ion mobility， lithium deposition behavior，and lithium metal battery performance of these systems are systematically analyzed. The results show that the PP3501 separator exhibits the best compatibility with the ionic liquid-based electrolyte，achieving a high lithium-ion conductivity （0.103mS/cm ）and uniform lithium deposition on the lithium metal surface. This promotes stable cycling of Li|LiFePO4 batteries under high loading （ LiFePO4 active material loading of 11.25mg/cm2 ），with an initial discharge specific capacity of 129mA⋅h/g at a rate of （204 0.5C （where C represents the battery charge/discharge rate）. The findings provide theoretical and practical guidance for separator selection when using ionic liquids as electrolytes.

Keywords： ionic liquid-based electrolyte；lithium metal battery； lithium deposition behavior; separator-electrolyte system

随着电动汽车和规模化储能技术的快速发展[1-3]，开发兼具高能量密度与安全性的锂金属电池已成为能源材料领域的研究热点。（剩余14716字）