Binder-less chemical grafting of SiO2 nanoparticles onto polyethylene separators for lithium-ion batteries

Title
Binder-less chemical grafting of SiO2 nanoparticles onto polyethylene separators for lithium-ion batteries
Authors
구종민조상호나원준옥벼리고기환Albert S. Lee황석원이진홍
Keywords
Lithium ion battery; Separator
Issue Date
2019-03
Publisher
Journal of membrane science
Citation
VOL 573-627
Abstract
Silica nanoparticles were chemically grafted onto a porous polyethylene separator to improve the adhesion strength, thermal stability, and electrochemical performance of a polyolefin separator. A surface activation via UVO plasma treatment, followed by silane hybridization yielded a polymeric binder-free, thin coating of SiO2 nanoparticles onto the separator. The chemical grafting provided a much stronger adhesive strength (>&#8239; 2.5&#8239; N/cm), reduced thermal shrinkage (<&#8239; 5% at 120&#8239; °C), and higher ionic conductivity (0.84&#8239; mS/cm) than conventional physical coating of a ceramic particle-based polymer composite. Lithium-ion batteries fabricated with metallic lithium as the anode, a LiFePO4 (LFP) cathode and SiO2-grafted separator showed an excellent rate capability (68&#8239; mAh/g at 5&#8239; C) and cycling performance (143&#8239; mAh/g after 200 cycles).
URI
http://pubs.kist.re.kr/handle/201004/68993
ISSN
0376-7388
Appears in Collections:
KIST Publication > Article
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