Estimation of State-of-Charge for Zinc-Bromine Flow Batteries by In Situ Raman Spectroscopy

Title
Estimation of State-of-Charge for Zinc-Bromine Flow Batteries by In Situ Raman Spectroscopy
Author
이현주
Alternative Author(s)
Lee, Hyun Ju
Advisor(s)
김동원
Issue Date
2018-02
Publisher
한양대학교
Degree
Master
Abstract
A zinc–bromine redox flow battery (ZBB) has attracted increasing attention as a potential energy-storage system because of its cost-effectiveness and high energy density. However, its aqueous zinc bromide phase and non-aqueous polybromide phase are inhomogeneously mixed in the positive electrolyte. Furthermore, various equilibrium reactions, e.g., charge-transfer reactions, polybromide formation, and complexation, simultaneously occur in the battery. These complex reactions makes it difficult to systematically analyze its electrolyte, which a crucial component for the stable operation of the battery. the accurate estimation of the State-of-Charge(SOC) is difficult. Especially, it is crucial for preventing overcharging or discharging and side reactions. As a result, there have been few studies on the SOC estimation in ZBBs. In this study, in situ Raman spectroscopy is employed for the real-time estimation of the SOC in 25 charge–discharge cycles. To exclude errors arising from inhomogeneous dispersion of the non-aqueous phase, the SOC is monitored in the negative electrolyte. External standard solutions are measured, and the calibration curve is constructed just before in situ measurements at every cycle to minimize instrumental errors, e.g., those caused by alignment. This in-situ methodology exhibits high accuracy and reproducibility.
URI
http://www.dcollection.net/handler/hanyang/000000105807http://repository.hanyang.ac.kr/handle/20.500.11754/68687
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > CHEMICAL ENGINEERING(화학공학과) > Theses (Master)
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