Highly Porous Polyimide Gel for Use as a Battery Separator with Room-Temperature Ionic Liquid Electrolytes
Rocco P. Viggiano, James Wu, Daniel A. Scheiman, Brianne DeMattia, Patricia Loyselle, Baochau N. Nguyen
TL;DR
This paper introduces a new battery separator made of a highly porous polyimide gel that works well with nonflammable ionic liquid electrolytes, offering a safer alternative for lithium-ion batteries.
Contribution
The novelty lies in developing a cross-linked polyimide gel separator that is highly compatible with room-temperature ionic liquids, enabling safer and more stable battery systems.
Findings
The polyimide gel separator has high porosity (>85%) and excellent thermal stability (decomposition onset >561°C).
The separator works effectively with nonflammable ionic liquid electrolytes, achieving room-temperature conductivities around 10−3 S/cm.
EMIM-TFSI-based electrolytes showed the best performance and retained conductivity after four months at 75°C.
Abstract
Advanced aerospace vehicle concepts demand concurrent advances in energy storage technologies that improve both specific energy and safety. Commercial lithium-ion batteries commonly employ polyolefin microporous separators and carbonate-based liquid electrolytes, which can deliver room-temperature ionic conductivities on the order of 10−3–10−2 S/cm but rely on inherently flammable solvents. Room-temperature ionic liquids (RTILs) offer a nonvolatile, nonflammable alternative with a stable electrochemical window; however, many RTILs exhibit poor compatibility and wetting with polyolefin separators. Here, we evaluate highly porous, cross-linked polyimide (PI) gel separators based on 4,4′-oxydianiline (ODA) and biphenyl-3,3′,4,4′-tetracarboxylic dianhydride (BPDA), cross-linked with Desmodur N3300A, formulated with repeating unit lengths (n) of 30 and 60. These PI gel separators exhibit an…
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Taxonomy
TopicsAdvanced Battery Materials and Technologies · Ionic liquids properties and applications · Dielectric materials and actuators