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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Polymer Electrolyte Membrane with High Ionic Conductivity and Enhanced Interfacial Stability for Lithium Metal
Fengquan Liu1, Fengjuan Bin1, Jinxin Xue1
1Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, China.
ACS Applied Materials & Interfaces
|April 30, 2020
Summary
A novel cross-linked polymer electrolyte membrane enhances lithium metal battery safety and performance. This solid polymer electrolyte offers high ionic conductivity and stability, addressing key challenges for safer, next-generation batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Chemistry
Background:
- Solid polymer electrolytes are crucial for enhancing the safety of lithium metal batteries (LMBs).
- Key limitations hindering their application include low room-temperature ionic conductivity and significant interfacial resistance.
- Addressing these challenges is vital for the advancement of safer battery technologies.
Purpose of the Study:
- To synthesize a novel cross-linked polymer electrolyte membrane (PEM) for improved lithium metal battery performance.
- To investigate the ionic conductivity, interfacial properties, and electrochemical stability of the synthesized PEM.
- To evaluate the safety and cycle performance of LMBs utilizing the developed PEM.
Main Methods:
- Synthesis of a cross-linked polymer electrolyte membrane using an unsaturated polyester.
- Measurement of ionic conductivity at various temperatures, focusing on room temperature performance.
- Characterization of electrochemical stability window and thermal stability.
- Fabrication and testing of LiFePO4-Li coin cells and pouch pack batteries with the PEM.
Main Results:
- The synthesized PEM exhibits high ionic conductivity (1.99 × 10⁻³ S cm⁻¹ at 30 °C) and a low glass transition temperature (-54.2 °C).
- The PEM effectively reduces interfacial resistance, promotes uniform lithium deposition, and suppresses dendrite penetration.
- The membrane demonstrates a wide electrochemical stable window (∼4.6 V) and superior thermal stability (>150 °C).
Conclusions:
- The developed cross-linked polymer electrolyte membrane shows significant potential for enhancing the safety and performance of solid-state lithium metal batteries.
- Its favorable properties address critical limitations of current solid polymer electrolytes, paving the way for practical applications.
- The PEM is a promising candidate for future high-performance and safe solid-state LMBs.
