Invited Speaker
Dr. Sajid Hussain Siyal
Chairman, Department of Metallurgy and Materials Engineering,Dawood University of Engineering and Technology, Pakistan
Speech Title: A Dual-functionality for Lithium Metal Batteries to Enhance Stability and Suppress Dendrite Formation Using UV Electrolyte/Separator Film
Abstract: Lithium-metal batteries (LMBs) are promising energy storage devices due to the high capacity and minimum negative electrochemical potential. Nevertheless, their concrete applications remain disturbed by unbalanced electrolyte-electrode interfaces, limited electrochemical window, and high-risk. Herein, a novel strategy to obtain dual ceramic-based electrolytes that possess great potential in energy storage due to their higher level of energy densities in LMBs. Electrolyte film developed via the curable system, aimed to prepare flexible Li+ interpenetrating network film to integrate the two ceramic structures with polyethylene oxide to yield the free-standing electrolytes film for better battery safety and desired interfacial stability. The films presented a satisfactory electrochemical performance, including, good ionic conductivity, large transference number, and wide electrochemical stability window (ESW) at room temperature. Most importantly, the fundamental function of fillers is to support building a stable solid-electrolyte-interphase (SEI) and limits the growth of dendrites. Thus, prepared dual ceramic-based electrolytes effectively renders to inhibit lithium dendrite growth in a symmetrical cell test during charge/discharge at a current density of 2 mA/cm2 and 0.25 mA/cm2 above 2000 h without short-circuiting occurrence at room temperature. Besides, the battery assembled of exhibits superior cyclic stability with high columbic efficiency. This research recommends that the binary network structures of Li-ion conductor help to design a prime solution of promising electrolyte for high-performance LMBs applications.
Keywords: Electrolytes, PEO, PVP, lithium-metal batteries, Li-dendrites.
Biography: Dr. Sajid Hussain Siyal is currently working as Chair of the Department of Metallurgy and Material Engineering, Dawood University of Engineering and Technology Karachi since Nov 2020. He joined the Dawood University of Engineering and Technology, Karachi, as lecturer (May, 2009), soon after his graduation in Metallurgy and Materials Engineering, Mehran University of Engineering and Technology, Jamshoro. He completed his Masters in Materials Engineering from NED University of Engineering and Technology Karachi and Ph.D. in Materials Science and Engineering from Advanced Composite Center, State Key Laboratory of Organic-Inorganic composites, Beijing University of Chemical Technology in December 2019. Dr. Sajid Siyal published more than 50 research Articles. His research areas are solid state electrolytes for energy storage devices, inorganic fillers for polymers, smart materials, high performance materials and lithium ion batteries (energy storage devices).