Title :
Assessment of influence of finely dispersed carbon nanotubes in polymer electrolytes for lithium batteries
Author :
Lee, Kwang-Pill ; Gopalan, Anantha Iyengar ; Manian, Kalayil Manian Pillai ; Santhosh, Padmanabhan ; Soo, Kim Kyu
Author_Institution :
Department of Chemistry Graduate School, Kyungpook National University, Daegu 702-701, South Korea; Nano Practical Application Center, Daegu 704-230, South Korea
Abstract :
Electrospun membranes of poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP)/multi-walled carbon nanotubes (MWCNTs) composite are prepared and loaded with lithium salts. Field emission electron microscopy provides evidence for the uniform distribution of MWCNTs into the polymer matrix. Interconnected morphology for the composite provides path for lithium ion conduction. Results from electrochemical impedance spectroscopy inform that the presence of MWCNTs in PVdF-HFP matrix improves interfacial stability between lithium electrode and membrane and augment conduction path. Equivalent circuits are generated based on impedance analysis to reveal the contribution of MWCNTs toward conductivity. A prototype cell is fabricated. The electrospun PVdF-HFP/MWCNT (2%) shows an ionic conductivity of about 5.85 mS/cm at 25°C and a high anodic stability.
Keywords :
Batteries; carbon compounds; energy storage; impedance measurements; nanotechnology; Batteries; Biomembranes; Carbon nanotubes; Circuit stability; Conductivity; Electron emission; Electron microscopy; Integrated circuit interconnections; Lithium; Polymers; Batteries; carbon compounds; energy storage; impedance measurements; nanotechnology;
Conference_Titel :
Nanotechnology, 2006. IEEE-NANO 2006. Sixth IEEE Conference on
Print_ISBN :
1-4244-0077-5
DOI :
10.1109/NANO.2006.247630
