Binder-less chemical grafting of SiO2 nanoparticles onto polyethylene separators for lithium-ion batteries
- Binder-less chemical grafting of SiO2 nanoparticles onto polyethylene separators for lithium-ion batteries
- 구종민; 조상호; 나원준; 옥벼리; 고기환; Albert S. Lee; 황석원; 이진홍
- Lithium ion battery; Separator
- Issue Date
- Journal of membrane science
- VOL 573-627
- 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  °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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