Aluminum Hydroxide-Based Flame-Retardant Composite Separator for Lithium-Ion Batteries

摘要: Despite the extensive use of polyolefins, especially in form lithium-ion battery (LIB) separators, their flammability limits large-scale applications. Therefore, fabrication flame-retardant LIB separators has attracted much attention recent years. In this work, composite were fabricated by applying a ceramic-based coating composed metal hydroxide as filler and agent (Aluminium hydroxide, Al(OH)3) binder (Poly(vinylidene Fluoride-co-hexafluoropropylene), P(VDF-HFP)) to polypropylene (PP) commercial separator. Thermal shrinkage, thickness, air permeability, porosity, wettability, ionic conductivity, flame retardancy, electrochemical performance ceramic-coated separator investigated. The results showed that addition Al(OH)3 particles improved thermal shrinkage ( 8 %) retardancy separator, which can prevent dimensional changes at high temperatures significantly increase LIBs safety. Applied 11 µm layer on PP had 76 % porosity increased value permeability from 278.15 (s/100 cc air) 312.8 air), causing facile permeation through pores than one. Furthermore, suitable electrolyte uptake contact angle ceramic coated (135 91.19°, respectively) facilitated ion transport pores, effectively conductivity Al(OH)3-coated (about 1.4 times higher bare separator). Moreover, cell comprising better cyclic All these characteristics make an appropriate candidate ensure safety LIB.