Disciplines
Inorganic Chemistry
Abstract (300 words maximum)
The cathode dissolution is a known phenomenon for manganese dioxide (MnO2) based cathode materials in both aqueous and non-aqueous batteries. Upon battery discharge, reduced Mn3+ species disproportionate (2Mn3+→ Mn4+ + Mn2+) and Mn2+ dissolves into the electrolyte causing the loss of active material. While MnO2 is a promising cathode for rechargeable aqueous zinc ion batteries (ZIB) due to its availability and low toxicity, the electrochemical performance is limited during battery cycling due to the dissolution of the cathode. In this work, a homogeneous sol-gel SiO2 coatings with various thicknesses on hydrothermally synthesized α-MnO2 nanorods are reported. In-depth characterization of SiO2 coated α-MnO2 are done by X-ray diffraction spectroscopy, Brunauer-Emmett-Teller surface area analysis, X-ray photon spectroscopy, thermogravimetric analysis and scanning and transmission electron microscopy to analyze the surface of the silica coated α-MnO2 cathodes. The electrochemical performance of the SiO2 coated α-MnO2 cathodes are studied in two electrode zinc batteries at room temperatures using a Zn metal anode and in 2 M ZnSO4 and 1 M TFSI electrolytes. The cathode dissolution is investigated by determining the total dissolved Mn content by inductively coupled plasma spectroscopy and characterization of the cycled electrodes by X-ray diffraction spectroscopy. Electrochemical performances of SiO2 coated α-MnO2 are evaluated using cyclic voltammetry, electrochemical impedance spectroscopy, and Galvanostatic cycling tests. This study will further benefit all different battery types that have the same cathode dissolution problem.
Academic department under which the project should be listed
CSM - Chemistry and Biochemistry
Primary Investigator (PI) Name
Altug Poyraz
Included in
Investigating Cathode Dissolution by Homogenous Sol-Gel Coating on Manganese Dioxide Nanofibers to Extend Battery Performance
The cathode dissolution is a known phenomenon for manganese dioxide (MnO2) based cathode materials in both aqueous and non-aqueous batteries. Upon battery discharge, reduced Mn3+ species disproportionate (2Mn3+→ Mn4+ + Mn2+) and Mn2+ dissolves into the electrolyte causing the loss of active material. While MnO2 is a promising cathode for rechargeable aqueous zinc ion batteries (ZIB) due to its availability and low toxicity, the electrochemical performance is limited during battery cycling due to the dissolution of the cathode. In this work, a homogeneous sol-gel SiO2 coatings with various thicknesses on hydrothermally synthesized α-MnO2 nanorods are reported. In-depth characterization of SiO2 coated α-MnO2 are done by X-ray diffraction spectroscopy, Brunauer-Emmett-Teller surface area analysis, X-ray photon spectroscopy, thermogravimetric analysis and scanning and transmission electron microscopy to analyze the surface of the silica coated α-MnO2 cathodes. The electrochemical performance of the SiO2 coated α-MnO2 cathodes are studied in two electrode zinc batteries at room temperatures using a Zn metal anode and in 2 M ZnSO4 and 1 M TFSI electrolytes. The cathode dissolution is investigated by determining the total dissolved Mn content by inductively coupled plasma spectroscopy and characterization of the cycled electrodes by X-ray diffraction spectroscopy. Electrochemical performances of SiO2 coated α-MnO2 are evaluated using cyclic voltammetry, electrochemical impedance spectroscopy, and Galvanostatic cycling tests. This study will further benefit all different battery types that have the same cathode dissolution problem.