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Updated: May 21, 2025
Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
A Fiber-Reinforced Poly(ionic liquid) Solid Electrolyte with Low Flammability and High Conductivity for
Junyan Tang1, En Chen1, Dehua Wang1
1Key Laboratory for the Green Preparation and Application of Functional Materials, Ministry of Education, Hubei Key Laboratory of Polymer Materials, Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, School of Materials Science and Engineering, Hubei University, Wuhan 430062, China.
Abstract:
Construction of polymer-based solid electrolytes with both low flammability and high ionic conductivity for lithium-metal batteries is still a great challenge but highly desirable. Herein, we report on a series of fiber-reinforced poly(ionic liquid) solid electrolytes prepared through an in situ copolymerization of ionic liquid monomers (IL) and poly(ethylene glycol) diacrylate (PEGDA) units with different ratios inside a polyacrylonitrile (PAN) fiber membrane. Such PAN/Poly-IL-PEGDA composite electrolytes demonstrate promising low flammability due to the excellent fire-resistant feature of the employed IL units. Moreover, it is remarkable to see that the optimized PAN/Poly-IL-PEGDA-1 electrolyte also exhibits highly dense structure with low thickness (31 μm), high ionic conductivity (0.32 mS cm-1 at 30 °C), and wide electrochemical window (up to 4.8 V). As a result, both LiFePO4//Li and NCM//Li full cells with such an electrolyte exhibit both excellent rate capability and cycling stability. This study provides a simple strategy for preparing composite polymer electrolytes with low flammability and high conductivity for high-performance lithium-metal batteries.
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