High Density Polyethylene Membrane Filled with Alumina Prepared by a Gamma Ray Irradiation

Abstract

High density polyethylene (HDPE) membrane filled with alumina particles was prepared by a wet process for a Li-ion secondary battery. Soybean oil and dibutyl phthalate (DBP) were premixed as the co-diluents. Gamma ray irradiation was used for crosslinking of HDPE. The HDPE membrane filled with alumina particles had excellent mechanical property and thermal stability due to the alumina particles and irradiation crosslinking. The tensile strength of the membrane increased with an increased amount of alumina up to 15 wt%. The thermal shrinkage of the membrane decreased with an increased amount of alumina up to 15 wt%. The electrochemical stability of the irradiated membrane after extraction was improved with irradiation dose up to 50 kGy.

Lithium ion battery separators: Development and performance characterization of a composite membrane

“…Heat exposure to these stretched separators initiates re-coiling of the elongated polymer chains, observed as shrinkage or the shape memory effect, causing stress to build at the fixed points of the separator. Creating non-woven mat separators and coating commercial separators with fine ceramic particles have been evaluated to mitigate or avoid the thermal shrinkage [4][5][6][7][8][9][10][11][12][13][14][15][16].…”

“…Therefore, one route is to use them as coating layers on commercial separators or even on electrodes directly [13][14][15][16]. Particle coated separators have exhibited an improved thermal stability at high temperatures, without significant thermal shrinkage, due to a specified loading of micro or nano particles [13][14][15]. A drawback is that ceramic particles at the face of a separator may fall off during handling and result in a non-uniform current density across the electrodes during cycling, causing accelerated battery degradation.…”

Semi‐Interpenetrating Polymer Electrolyte as a Coating Layer Constructed on Polyphenylene Sulfide Nonwoven to Afford Superior Stability and Performance for Lithium‐Ion Batteries

“…This is associated with the construction of semi‐interpenetrating network in composite separator, which can have a strong force to restrict electrolyte, thus weakening the decomposition of solvent molecules [46] . Additionally, with SIPN as coating material, the composite separator can present a steady framework to tolerate oxidation degradation, thus giving remarkable electrochemical stability [47] . This better anode stability of SIPN/PPS separator will allow battery working at a wide voltage range or withstanding occasional over charging and discharging.…”

“…[46] Additionally, with SIPN as coating material, the composite separator can present a steady framework to tolerate oxidation degradation, thus giving remarkable electrochemical stability. [47] This better anode stability of SIPN/PPS separator will allow battery working at a wide voltage range or withstanding occasional over charging and discharging.…”