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Thermally Stable and Dendrite-Resistant Separators toward Highly Robust Lithium Metal Batteries

机译：Thermally Stable and Dendrite-Resistant Separators toward Highly Robust Lithium Metal Batteries

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摘要

High-level safety is of vital importance to the continuous pursuit of highenergy-density batteries in the increasingly electrified world. The thermalinstability and dendrite-induced issues of conventional polypropylene (PP)separators often cause internal short circuits and thermal runaway in batteries.Herein, a thermally stable and dendrite-resistant separator (F-PPTA@PP) isconstructed using a dual-functional and easy-to-commercialize design strategyof thermally safe poly-p-phenylene-terephthamide nanofibers and plasmainducedlithiophilic fluorine-containing groups. In situ thermal monitoring,in situ optical observation, and multiphysics simulation demonstrate thatF-PPTA@PP can suppress thermal shrinkage of the separator and the formationof hotspots, and also promote uniform lithium deposition. Subsequently,lithium metal batteries are assembled, featuring an initial capacity of194.1 mAh g~（–1） at 0.5 C with a low-capacity attenuation of 0.02% per cycle over1000 cycles. When operating under extreme conditions, i.e., ?10 and 100 ℃,ultrafast charging/discharging rates up to 30 C, lean electrolyte (2.4 μL mg~（–1）)/high mass-loading (10.77 mg cm~（–2）) or lithium-sulfur batteries, F-PPTA@PPseparator still enables competitive electrochemical performance, highlightingits plausible processing scalability for high-safety energy storage systems.

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