Search for New Cathode Compositions for Mildly Acidic Zn-MnO2 Batteries

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2022-3-25

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Akbaş, Yiğit

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This thesis focuses on finding a new MnO2-based cathode composition(s) for Zn-ion batteries. For this purpose combinatorial approach was employed using thick film cathodes deposited via magnetron sputtering. The system under study was MnO2 alloyed with NaMnO2, Bi2O3, NiO. For this purpose, four sputter targets were prepared. MnO2 target was in 3-inch diameter placed in the central position and the other oxides were 2-inch in diameter placed 120° to one another forming a triangle. Substrates were 12.7 mm in diameter placed in a substrate magazine with a triangular geometry mimicking the targets underneath. A total of 36 cathode could be deposited in a single sputtering experiment each with a different composition. A total of six experiments were carried yielding 216 cathodes. Cathodes were deposited on Ni foil used as a current collector. They were typically 3 μm thick with a mass varying from 0.23 to 2.38 mg. Cells used was of Swagelok type, anode was 300 μm thick Zn foil electrolyte was 2M ZnSO4 + 0.1 M MnSO4 aqueous solution. The preliminary results indicated favorable results in Mn rich cathodes. As a result, out of six sets three set of cathodes were selected for detailed study. Cyclic voltammetry as well as galvanostatic tests were carried for each cathode. Mn rich corner of the Bi-Mn-Ni ternary diagram where Na varied from 11 to 78% were mapped in terms of capacities, cyclic stability, and discharge plateau potential. Based on maps, three candidate compositions were selected with discharge capacities above 400 mAh/g. These are Bi0.04Na0.55Ni0.04Mn0.36Ox, Bi0.04Na0.37Ni0.06Mn0.53Ox and Bi0.02Na0.63Ni0.02Mn0.33Ox. Further work is needed to check the full potential of the selected cathodes.

Subject Keywords

MnO2 cathodes, Zin-ion battery, Combinatorial deposition, Magnetron sputtering, MnO2 katot, Çinko-iyon pil, Eşzamanlı üretimli çöktürme, Magnetron sıçratma çöktürme

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https://hdl.handle.net/11511/96799

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

Y. Akbaş, “Search for New Cathode Compositions for Mildly Acidic Zn-MnO2 Batteries,” M.S. - Master of Science, Middle East Technical University, 2022.