Development of Hybrid Redox Flow Battery and Preliminary Studies of Univalent and Bivalent Chemistry
Başlık:
Development of Hybrid Redox Flow Battery and Preliminary Studies of Univalent and Bivalent Chemistry
Yazar:
Rao, Santosh G. N., author.
ISBN:
9780438140226
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (101 pages)
Genel Not:
Source: Masters Abstracts International, Volume: 57-06M(E).
Advisors: Ramesh K. Guduru Committee members: Mazumder A K M Monayem H.; Reddy G. N.
Özet:
This thesis work describes the large-scale energy storage, which is a big challenge the renewable energy sectors are facing currently. New systems with low cost, high energy density, and longer cycle life are desired for grid storage. Among several types of storage devices, the Redox flow battery (RFB) has emerged as the promising technology for static and grid energy storage.
The RFBs are enjoying a renaissance due to their ability to store large amounts of electrical energy at a cheaper price with higher efficiency. Innovations are being made to the RFBs by varying the components of the anodic and cathodic parts of the battery while studying the kinetics of the chemical processes that take place within the cell.
In this work, we studied the RFB with different chemistries. The bivalent RFB chemistry utilized graphite as the cathodic current collector and aqueous Vanadium pentoxide (V2O5) solvent as the catholyte, metallic Copper (Cu) as an anode and the aqueous Copper sulphate (CuSO 4) as the anolyte.
In the case of univalent RFB, we used graphite as the cathodic current collector and aqueous Vanadium pentoxide (V2O5) solvent as catholyte, Lithium Nickel Manganese Cobalt Oxide (LiNiCoMnO2) as an anode and the aqueous Lithium sulphate (Li2SO 4) as the anolyte.
We also designed and fabricated a setup to test the lab-scale RFB and performed the experiments by varying the test parameters for the and bivalent RFB systems.
In addition, we ran tests on above two chemistries, the first being without flow for the bivalent system and the second facilitating the flow of the electrolytes in and out of the system.
With changing the molarity of vanadium catholyte and the CuSO4 anolyte we could observe a reduction in the impedance with increasing ionic concentration. As the copper surface was well passivated by CuSO4 electrolytic solution and oxidation of nascent copper deposited, the ionic movement at the copper electrode was largely affected. We tested various molarity and flow rates of the solutions using the cyclic voltammetry and galvanostatic charge discharge tests, and the results showed varying capacities as per the concentrations of the solution. We also tested the Lithium Vanadium redox flow battery using the Lithium sulphate solution with varying flow rates. This new system reflected the proof of concept of lithium's univalent chemistry with some irreversibility possibly owing to the intercalation related challenges within the lithium electrode.
From the non flow setup tests, we noticed that the increasing concentration of the anolyte and/or catholyte reduced the impedance of the system. On the other hand, the flow setup tests showed a better capacity for bivalent system compared to the univalent chemistry. From the microscopy and X-ray diffraction analysis of the electrodes, the deposition of copper crystals was observed with consecutive oxidation or passivation which hampered the cyclability characteristics of the system. These studies demonstrated the proof-of-concept of working of two new chemistries of Li and Cu for RFB battery systems which were never investigated before. However, the irreversibility issues in both the systems are yet to be solved for real time applications.
Notlar:
School code: 0424
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(692622.1) | 692622-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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