Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Search for New Cathode Compositions for Mildly Acidic Zn-MnO2 Batteries
Download
10459698.pdf
Date
2022-3-25
Author
Akbaş, Yiğit
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
227
views
0
downloads
Cite This
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
URI
https://hdl.handle.net/11511/96799
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Combinatorial development of LSF-based cathode materials for intermediate temperature solid oxide fuel cells
Kılıç, Fahrettin; Öztürk, Tayfur; Department of Metallurgical and Materials Engineering (2021-6)
This thesis focuses on the synthesis, characterization, and processing of LSF based composite cathode for solid oxide fuel cells. The cathode comprises three oxides; LSM, LSF and ScSZ which are synthesized by co-sputtering using combinatorial approach. The electrolyte was Scandia doped Zirconia(ScSZ), as it has attractive ionic conductivity at lower temperatures. Having chosen the electrolyte ScSZ as electrolyte. After detailed analysis with regard to conductivity and thermal expansion for each oxide, the c...
Detection of component composition mismatch with axiomatic design
Toğay, Cengiz; SUNDAR, Gayathri; Doğru, Ali Hikmet (2006-04-02)
This paper presents a software component composition methodology based on Axiomatic Design theory and Design Structure Matrix. The methodology we propose helps overcome anomalies and functional problems such as deadlock. Our approach can be described in two steps. First, we decompose the system to detect coupled components by using the Design Structure Matrix. Secondly, we represent attribute and method dependencies of the coupled components to identify issues during software composition using Design Matrix...
A comparison of subspace based face recognition methods
Gönder, Özkan; Halıcı, Uğur; Department of Electrical and Electronics Engineering (2004)
Different approaches to the face recognition are studied in this thesis. These approaches are PCA (Eigenface), Kernel Eigenface and Fisher LDA. Principal component analysis extracts the most important information contained in the face to construct a computational model that best describes the face. In Eigenface approach, variation between the face images are described by using a set of characteristic face images in order to find out the eigenvectors (Eigenfaces) of the covariance matrix of the distribution,...
Search for new long-lived particles at root s=13 TeV
Sirunyan, A. M.; et. al. (Elsevier BV, 2018-05-01)
A search for long-lived particles was performed with data corresponding to an integrated luminosity of 2.6 fb(-1) collected at a center-of-mass energy of 13 TeV by the CMS experiment in 2015. The analysis exploits two customized topological trigger algorithms, and uses the multiplicity of displaced jets to search for the presence of a signal decay occurring at distances between 1 and 1000 mm. The results can be interpreted in a variety of different models. For pair-produced long-lived particles decaying to ...
Search for supersymmetry (susy) wıth topologıcal varıables at the LHC
Ünal, Mesut; Zeyrek, Mehmet Tevfik; Çakır, Muammer Altan; Department of Physics (2015)
The primary purpose of this thesis is to compare the effects on signal significance of the topological variables, W-stransverse mass ($M^W_{T2}$) and topness, which would be used in Supersymmetry searches in the single lepton channels in the future collider experiments. In this thesis, Stau-coannihilation scenarios were used as signal samples along with the four major background events, $t\bar{t}$+jets, boson+jets, single top+jets, and diboson, of supersymmetric top squark pair production and cascade decays...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
Y. Akbaş, “Search for New Cathode Compositions for Mildly Acidic Zn-MnO2 Batteries,” M.S. - Master of Science, Middle East Technical University, 2022.