Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/139096
Title: MEMBRANES FOR REDOX FLOW BATTERIES
Authors: CHNG MEI LIN
Keywords: redox flow battery, shunt current, contact resistance, ion exchange membrane, polyvinylidene fluoride, styrene sulfonic acid
Issue Date: 19-Jan-2018
Citation: CHNG MEI LIN (2018-01-19). MEMBRANES FOR REDOX FLOW BATTERIES. ScholarBank@NUS Repository.
Abstract: This thesis focuses on two critical aspects of stack design optimization and membrane development for vanadium redox flow battery. A novel external manifold was developed which can minimize shunt current loss without increasing maintenance cost or assembly complexity. A uniform potential distribution was obtained with the coulombic efficiency remaining almost constant throughout the 30 cycles. Another flow frame with support beam design reduces bulky resistance with no significant increase in flow resistance while maintaining a uniform flow. The flow frame with support beams reduces the contact resistance by 27%. A promising membrane is also explored using low-cost polymer blends consisting of polyvinylidene fluoride (PVDF) and styrene sulfonic acid (SSA). Preliminary studies shows that the membrane using the blending ratio of PMMA-SSA (7:3) with 50 wt% of PVDF shows the most promising result with an energy efficiency of 80% at 50 mA/cm2, which is comparable to that of commercial Nafion membranes.
URI: http://scholarbank.nus.edu.sg/handle/10635/139096
Appears in Collections:Master's Theses (Open)

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