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M-aramid nanocomposite separators for energy storage applications

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Liu, Michael Zhi-Hong
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Yushin, Gleb
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Abstract
Lithium-ion battery separators comprised of a nanocomposite of aramid polymer and alumina nanowires were presented as a new membrane architecture for more a thermally resistant and electrochemically superior alternative to the status quo. Porous membranes were produced by electrospinning low concentration m-aramid polymer (13%) with dispersed alumina nanowires. Resulting nanocomposite separators were non-woven mats that exhibited fast wettability, high integrity in thermo-gravimetric analysis tests up to 480C, and less than 10% area shrinkage when exposed to temperatures up to 280C. Physical, mechanical, thermal, and electrochemical figures of merit were discussed first from a practical standpoint then further examined in the context of the electrospun membranes. Results were contrasted with the performance of current state-of-art polyolefin separators. These m-aramid nanocomposite separators prove to be a strong candidate for batteries situated in demanding environments or large format batteries where safety is of paramount concern.
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2020-04-28
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