Porous Sodium Alginate/Boehmite Coating Layer Constructed on PP Nonwoven Substrate as a Battery Separator through Polydopamine‐Induced Water‐Based Coating Method

Abstract

Ceramic‐coating separator produced by aqueous slurry has drawn considerable attention because of its environmental friendliness in the development of high‐power lithium ion battery (LIB). However, there are some drawbacks existed including the formation of compact coating layer and uneven distribution of slurry. In this study, porous sodium alginate/boehmite coating layer was designed to cover on low‐cost PP nonwoven to give a battery separator (abbreviated as PCS) through polydopamine‐ induced water‐based coating method, in which nonsolvent N‐methyl pyrrolidone (NMP) was added to render porous structures through its final evaporation and the pretreatment of polydopamine on substrate could help slurry dispersed uniformly. Thoroughly investigations demonstrate this designed separator can not only endow battery with superior cell performance but also display good thermal dimensional stability and self‐extinguishing behavior. Therefore, PCS composite separator is low‐cost, environmentally friendly and feasible to meet performance requirements of high‐power LIB.

Batch Fabrication of Electrospun PAN/PU Composite Separators for Safe Lithium-Ion Batteries

“…Currently, common approaches to improving the performance of commercial battery separators include coating modification [7,8] or selecting suitable materials to prepare composite separators via casting, phase conversion, electrospinning, freeze-drying, and so on [9][10][11][12][13]. Among these ways, electrospinning is a common method for preparing nanofiber separators, which can regulate the diameter of nanofibers.…”