Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 573, Issue -, Pages 621-627Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2018.12.039
Keywords
Lithium-ion battery; Separator; Silica nanoparticle; Chemical grafting
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Funding
- Basic Science Research Program through the National Research Foundation of Korea - Ministry of Science, ICT, and Future Planning [2017R1A2B3006469]
- Fundamental R&D Program for Core Technology of Materials, and Industrial Strategic Technology Development Program - Ministry of Knowledge Economy, Republic of Korea [10077545]
- Materials Architecturing Research Center of Korea Institute of Science and Technology (KIST)
- KU-KIST graduate school of Korea University
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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 (> 2.5 N/cm), reduced thermal shrinkage (< 5% at 120 degrees C), and higher ionic conductivity (0.84 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 mAh/g at 5 C) and cycling performance (143 mAh/g after 200 cycles).
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