離子液體基電解液與聚丙烯隔膜的兼容性研究

打開文本圖片集

關(guān)鍵詞：離子液體基電解液；鋰金屬電池；鋰沉積行為；隔膜-電解液系統(tǒng)中圖分類號：O646；TM912文獻標志碼：ADOI：10.7652/xjtuxb202507015 文章編號： 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

隨著電動汽車和規(guī)?；瘍δ芗夹g(shù)的快速發(fā)展[1-3]，開發(fā)兼具高能量密度與安全性的鋰金屬電池已成為能源材料領(lǐng)域的研究熱點。（剩余14716字）