Fabrication and Investigation of PE-SiO2@PZS Composite Separator for Lithium-Ion Batteries

Abstract

Commercial polyolefin separators exhibit problems including shrinkage under high temperatures and poor electrolyte wettability and uptake, resulting in low ionic conductivity and safety problems. In this work, core–shell silica-polyphosphazene nanoparticles (SiO2@PZS) with different PZS layer thicknesses were synthesized and coated onto both sides of polyethylene (PE) microporous membranes to prepare composite membranes. Compared to pure silica-coated membranes and PE membranes, the PE-SiO2@PZS composite membrane had higher ionic conductivity. With the increase in the SiO2@PZS shell thickness, the electrolyte uptake, ionic conductivity and discharge capacity gradually increased. The discharge capacity of the PE-SiO2@PZS composite membrane at 8 C rate was 129 mAh/g, which was higher than the values of 107 mAh/g for the PE-SiO2 composite membrane and 104 mAh/g for the PE membrane.

A high thermal stable pre‐oxidized polyacrylonitrile nanofiber separator for lithium‐ion battery

“…Among them, modifying traditional separators with ceramic materials or high-performance organic polymers and developing new promising polymer porous separators are consider to two main prominent approaches to enhance the thermal dimensional stability of separators. 17 Coating the one or both outermost surface of commercial polyolefin separator with inorganic materials such as ZSM-5, 18 MOF, 19 TiO 2 , 20,21 SiO 2 , 22,23 Al 2 O 3 , [24][25][26] ZrO 2 , 27 HAP 28 is considered the most efficient way for overcoming the defects of polyolefin separators. The coating layers normally include various types of inorganic powders as functional materials and multifarious polymers as binders.…”

Special Issue: Advanced Science and Technology of Polymer Matrix Nanomaterials

“…In the realm of electronics, nanocomposites have been employed for flexible and stretchable electronics, high-performance printed circuit boards, and advanced packaging materials [ 8 , 9 ]. The integration of nanofillers in polymer matrices has also revolutionized energy storage devices, enabling the development of high-capacity batteries, supercapacitors, and fuel cells [ 10 , 11 ]. Moreover, the unique properties of polymer matrix nanomaterials have been harnessed to fabricate sensors with enhanced sensitivity, selectivity, and stability [ 12 , 13 ].…”