CHE Seminars  

Speaker Prof. Sanjeev Kumar
Indian Institute of Science, Bangalore
Topic Energy Storage: Flow Batteries
Date 04,April 2016 (Monday)
Place L-2
4 pm. - 5 pm.

Harnessing energy from renewal resources such as solar, wind, and tidal waves is currently an area of intense research activity world wide. The last link in the chain---energy storage at large scale to supply energy when its generation is zero/low---is yet to receive similar attention, without which we cannot move away from non-renewal resources and meet energy needs at off-grid locations. After the early focus on storing energy in mechanical form, electrochemical storage has emerged as a preferred route in today's constrained context. Flow batteries, vanadium redox flow battery (VRFB) in particular, have emerged as promising. In this talk, we will examine VRFB to justify our forays into another flow battery, named soluble lead redox flow battery (SLRFB), a close cousin of the most widely used lead-acid battery, but with potential for unlimited cycle-life. SLRFB after being initially found to have a life of mere 100 cycles is recently shown to undergo 2000 cycles (and perhaps more) without any loss of efficiency, for a mild increase in intensity of agitation of electrolyte. The single cycle charge-discharge characteristics remain unaffected, even when agitation is completely stopped. The talks aims to bring out the underlying mechanisms for these unexpected and interesting effects, with implications for future evolution of SLRFB.

Sanjeev Kumar obtained BE from University of Roorkee, and ME and PhD from IISc Bangalore, all in Chemical Engineering. After spending a few years at Purdue University, he joined IISc as a faculty in 1996, and has since been there. He enjoys teaching `Modelling in Chemical Engineering' and `Interfacial Phenomena' courses for their unique character and the translated joy shown on student faces every year. His research interests are in exploring mechanisms underlying complex phenomena in the field of colloids and interfaces, using phenomenological and mathematical modelling, and experiments. The systems of interest are breakup and coalescence of drops in turbulent dispersions, stability of emulsions, characteristics of foams and their flow, controlled nanoparticle synthesis in new reactors, process intensification, and recently energy storage in electrochemical systems. His group is widely recognized for population balance modelling and state-of-the art techniques for their simulations of these models.

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