Development of a polyiodide aqueous/non-aqueous flow battery
department or school: Applied Science, Faculty of
department or school: Chemical and Biological Engineering, Department of
data provider: DSpace
degree campus: UBCV
creator: Jameson, Alexander
issued: 2024-05-06T21:44:35Z
issued: 2024
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: Redox flow batteries are considered to be one of the most realistic candidates for stationary energy storage applications in the range of kW/kWh up to tens of MW/MWh. The recently proposed zinc-iodine flow battery (ZIFB) is among the most promising flow batteries for such applications, having achieved the highest reported energy densities of any aqueous flow batteries to date. However, the energy efficiency of the ZIFB during cycling is still very low due to the thick iodine film that forms during charge and activation overpotentials associated with the iodine electrode reactions. In this thesis, I first investigated the effect of organic cosolvent additives and operating conditions on the ZIFB performance. The acetonitrile (5 vol%) cosolvent showed the most significant improvement to charge-discharge performance, increasing the energy efficiency from 59.4% to 70.0%. Cosolvents that were strongly protophilic preferentially interacted with Zn²⁺ over I₂ leading to the formation of insulative iodine deposits on the positive electrode during charge, but constructing a ZIFB with a posolyte absent of Zn²⁺ with 5 vol% DMF was able to increase the energy efficiency from 59% to 65.4% while maintaining the iodine dissolved in solution. I then studied the kinetics of the iodide redox reactions on various carbonaceous materials (carbon blacks and carbon nanotubes) for the purpose of being incorporated as a catalyst layer (CL) into the graphite felt (GF) positive electrode of the ZIFB. The Ketjenblack EC-300J carbon black performed the best out of the electrode materials studied due to a pore network capable of encapsulating iodine and promoting its adsorption on the pore walls. A ZIFB constructed with a Ketjenblack EC-300J CL on the GF surface adjacent to the battery separator increased the energy efficiency (at 40 mA/cm⁻²) from 63% to 76% and the discharge power density from 39.1 mW/cm⁻² to 44.1 mW/cm⁻² compared to the pristine GF without any CL. Addition of 5 vol% cosolvent f…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/88242
note: Development of a PolyiodideAqueous/Non-Aqueous Flow BatterybyAlexander JamesonB. Sc., Queen’s University, 2016MASc, Queen’s University, 2018A THESIS SUBMITTED IN PARTIAL FULFILLMENT OFTHE REQUIREMENTS FOR THE DEGREE OFDOCTOR OF PHILOSOPHYinThe Faculty of Graduate and Postdoctoral Studies(Chemical and Biological Engineering)THE UNIVERSITY OF BRITISH COLUMBIA(Vancouver)May 2024© Alexander Jameson 2024The following individuals certify that they have read, and recommend to the Faculty of Graduate and Post-doctoral Studies for acceptance, the dissertation entitled:Development of a Polyiodide Aqueous/Non-Aqueous Flow BatterySubmitted by Alexander Jameson in partial fulfillment of the requirements for the degree of Doctor of Philosophyin Chemical and Biological Engineering.Examining Committee:Dr. Elod Gyenge, Professor, Chemical & Biological Engineering, UBCSupervisorDr. Pierre Kennepohl, Professor, Chemistry, University of CalgarySupervisory Committee MemberDr. Kevin Smith, Professor, Chemical & Biological Engineering, UBCSupervisory Committee MemberDr. Dan Bizzotto, Professor, Chemistry, UBCUniversity ExaminerDr. David Dreisinger, Professor, Chemical & Biological Engineering, UBCUniversity ExamineriiAbstractRedox flow batteries are considered to be one of the most realistic candidates for stationary energy storageapplications in the range of kW/kWh up to tens of MW/MWh. The recently proposed zinc-iodine flowbattery (ZIFB) is among the most promising flow batteries for such applications, having achieved the highestreported energy densities of any aqueous flow batteries to date. However, the energy efficiency of theZIFB during cycling is still very low due to the thick iodine film that forms during charge and activationoverpotentials associated with the iodine electrode reactions.In this thesis, I first investigated the effect of organic cosolvent additives and operating conditions onthe ZIFB performance. The acetonitrile (5 vol%) cosolvent showed the most significant impr…
has type: Thesis/Dissertation
date issued: 2024-11
is shown at: 10.14288/1.0442346
language: eng
degree discipline: Chemical and Biological Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Gyenge, Előd
type: Text
identifier URI: http://hdl.handle.net/2429/88242