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

HE Taohong; ZHANG Cheng; LI Yu; HAN Yushan; ZHANG Zhicheng; WANG Jianan; YANG Honghui

doi:10.7652/xjtuxb202507015

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

更新时间：2025-07-09

- Study on the Compatibility of Ionic Liquid-Based Electrolytes with Polypropylene Separators
- Journal of Xi’an Jiaotong University Vol. 59, Issue 7, Pages: 150-158(2025)
- 作者机构：
  
  1.西安交通大学化学学院， 710049，西安
  2.西安交通大学能源与动力工程学院， 710049，西安
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202507015
  CLC： O646;TM912
- Received：26 November 2024，
  
  Online First：01 April 2025，
  
  Published：10 July 2025
- 稿件说明：
移动端阅览
HE Taohong, ZHANG Cheng, LI Yu, et al. Study on the Compatibility of Ionic Liquid-Based Electrolytes with Polypropylene Separators[J]. Journal of Xi’an Jiaotong University, 2025, 59(7): 150-158.
DOI：

HE Taohong, ZHANG Cheng, LI Yu, et al. Study on the Compatibility of Ionic Liquid-Based Electrolytes with Polypropylene Separators[J]. Journal of Xi’an Jiaotong University, 2025, 59(7): 150-158. DOI： 10.7652/xjtuxb202507015.

摘要

研究旨在通过探索离子液体基电解液与商业隔膜的兼容性，优化隔膜-电解液系统，从而提升锂金属电池的性能。选用3种商用聚丙烯隔膜（PP2500，PP3501，PP2325），结合一种特定的离子液体（三丁基（甲氧基甲基）膦六氟磷酸，[P

4441O1

]

[PF

]

）基电解液，构建了不同的隔膜-电解质系统，并对隔膜-电解液系统的锂离子迁移率、锂沉积行为和锂金属电池性能进行了系统研究。结果显示，PP3501隔膜与离子液体基电解液具有最佳的兼容性，能够实现高锂离子电导率（0.103 mS/cm）和锂金属表面均匀的锂沉积，从而促进Li|LiFePO

电池在高负载量（磷酸铁锂活性物质负载量为11.25 mg/cm

）下的稳定循环，且在0.5

（

为电池充放电倍率）倍率下的初始放电比容量达到129 mA·h/g。研究结果可以为离子液体作为电解质时的隔膜选择提供理论依据和实践指导。

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 (PP2500

PP3501

and PP2325) are selected and combined with a specific ionic liquid-based electrolyte (tributyl (methoxymethyl) phosphonium hexafluorophosphate

4441O1

]

[PF

]

) 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 (0.103 mS/cm) and uniform lithium deposition on the lithium metal surface. This promotes stable cycling of Li|LiFePO

batteries under high loading (LiFePO

active material loading of 11.25 mg/cm

)

with an initial discharge specific capacity of 129 mA·h/g at a rate of 0.5

(where

represents the battery charge/discharge rate). The findings provide theoretical and practical guidance for separator selection when using ionic liquids as electrolytes.

关键词

Keywords

references

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