• Title/Summary/Keyword: polyvinylidenefluoride (PVDF)

Search Result 12, Processing Time 0.017 seconds

Characteristics of Electric Conductivity and Adhesion with Current Collector According to Composition of $LiMn_2O_4$ Cathode (망간산화물 정극의 합제조성에 따른 전자전도특성 및 집전체와의 접착특성)

  • Eom Seung-Wook;Doh Chil-Hoon;Moon Seong-In
    • Journal of the Korean Electrochemical Society
    • /
    • v.4 no.1
    • /
    • pp.1-5
    • /
    • 2001
  • Composite ratio of $LiMn_2O_4$ in cathode was optimized as function of specific surface area. Binder has to be used as possible as little, and it should maintain adhesive property between cathode composite and current collector even though in electrolytes. For this purpose, We used 'Hot Roll Pressing' method, and it was effective. To prevent separation of cathode composite from current collector, PVDF(Polyvinylidenefluoride) has to be mixed more than $1.1\%$ in weight ratio to sum of surface area of lithium manganese oxide and conducting agents. Specific internal resistance was reduced as by increasing electrical conductivity of cathode. And Ratio of 2C rate discharge capacity to 0.2C rate discharge capacity was increased by $17\%$, as increasing electrical conductivity from 0.019 mS/cm to 0.036 mS/cm.

Characterization and Seawater Filtration Performance of Commerical Microfiltration and Ultrafiltration Membranes (상업용 정밀여과/한외여과막의 특성 분석 및 해수 여과 성능 평가)

  • Choi, Changkyoo;Kim, In S.
    • Journal of Korean Society of Environmental Engineers
    • /
    • v.39 no.9
    • /
    • pp.542-547
    • /
    • 2017
  • This paper was to analyze the membrane characterization of hydrophilicity, surface morphology and membrane chemical anlysis of three commercial microfiltration/ultrafiltration membranes, and evaluate the filtration performance of a seawater to assess the availability for pretreatment of desalination process. From the results of contact angle, Mem-3, fabricated with polyacrylonitrile, was highly hydrophilic. It find out that Mem-3 has more anti-biofouling property. In Field emission scanning electron microscope (FESEM), Mem-1 (polyethylene) and Mem-2 (Polyvinylidenefluoride) showed the sponge-like shape and Mem-3 showed finger-like shape. Membrane chemical analysis by energy dispersive spectrometer (EDS) presented that Mem-2 was mostly fluoride and Mem-3 had s high ratio of N (32.47%) due to the nitrile group. The permeation flowrate per time on suction pressures using deionized water (D.I. water) tends that permeation rate of Mem-3 more increased when the pressure was increased compared to other membranes. From the results of turbidity and total suspended solids (TSS) removal, turbidity of permeate was 0.191 NTU to 0.406 NTU and TSS was 2.2 mg/L to 3.0 mg/L in all membranes, indicating that it was not suitable for the pretreatment of seawater desalination by short-term experiments.