Investigation on the VRB-ESS capacity decay issue
This project investigates the vanadium redox flow battery (VRB) system, in particularly, the capacity decay issue of VRB. Vanadium redox flow battery system is a unique energy storage technology with great potential in grid-scale energy storage due to its decoupled power/energy feature and flexib...
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Format: | Theses and Dissertations |
Language: | English |
Published: |
2016
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Online Access: | http://hdl.handle.net/10356/68755 |
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Institution: | Nanyang Technological University |
Language: | English |
Summary: | This project investigates the vanadium redox flow battery (VRB) system, in particularly, the
capacity decay issue of VRB. Vanadium redox flow battery system is a unique energy storage
technology with great potential in grid-scale energy storage due to its decoupled power/energy
feature and flexible control strategy. Despite the popularity of VBR system, a series of technical
challenges obstruct the widespread implementation. Among these, capacity loss is the key issue
limiting the longevity of vanadium flow battery. Capacity loss is mainly caused by the undesired
species crossover due to the imperfection of membrane.
There are two main parts to this project. The first part is to design a Labview system with graphic
interface that allows a user to monitor and control the operation of a vanadium redox flow battery.
This part of the project focused on circuit connection, selection of components and LabVIEW
graphical program. The second part of this project concentrates on the analysis of the ionic
transport mechanisms of capacity decay. Effects of electrolyte concentration flux and species
crossover in VRB system are discussed in detail, as well as their relationship with the capacity
decay issue. Higher flow rate will always lead to higher concentrate flux and decrease in the
species concentration will result in the decrease of charge transfer current density. |
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