Lama Mahmoud
Zayed University, UAE
Posters & Accepted Abstracts: J Material Sci Eng
Li-ion batteries (LIBs) are currently the leading energy storage technology. Owning to its electrochemical convenience, light weight and ease of fabrication, LIBs are used for portable power-hungry devices such as electric vehicles (EV) and hybrid electric vehicles (HEV). Specifically, Lithium Iron Phosphate (LiFePO4) is an environmentally friendly material with superior electrochemical properties to serve as a cathode material in LIBs. Currently, LiFePO4 is tied by its poor electrical conductivity in the order of 10-9 S/cm and sluggish ion diffusion coefficient in the order of 10-16 cm2/s; both of which are key culprits in limiting its commercialization. In this work, Carbon nanostructures (CNS), which consist of a macrostructure of highly entangled MWCNTs in a networked form, are used as a conductive additive as well as microbinder for LiFePO4. Results confirm that the 3D conductive network encapsulated the LiFePO4 particles homogenously facilitating the charge transfer at the electrode-electrolyte interface and within the interior of the electrode. Consequently, composition, scan rate and porosity of the paper-like cathode were sequentially varied and their influence was systematically monitored by means of Linear Sweep Cyclic Voltammetry (CV) and AC electrochemical Impedance Spectroscopy (EIS) tests. A key finding in this portion of the work is that electrodes with 20 wt.% and 49±2.5% porosity had realized improvements of two folds and four folds in the electronic conductivity and diffusion coefficient, respectively, in comparison to conventional LiFePO4/PVDF/C cathodes. As such, the developed LiFePO4/ CNS composite cathodes could potentially serve for high power density and microelectronic applications.
E-mail: eng.lama.mahmoud@gmail.com
Journal of Material Sciences & Engineering received 3677 citations as per Google Scholar report
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