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Flame-retardant properties. The specific burning time test of sulfur electrodes with (a) S-PVDF electrode and (b) S-APP electrode. The times indicated in the pictures are counted as soon as the electrodes are exposed to the direct flame from a lighter (indicated by the white arrow in panel a). (c) The specific burning time of the sulfur cathodes with APP and PVDF binders. (d) Schematic showing the flame-retardant mechanism of the APP binder based sulfur electrode.
