Structure-function of novel glasses for possibility as cathode of Li-ion battery: Lithium manganese borate glasses

Abstract

Novel manganese-lithium borate glasses and its possibility as cathode materials in Li-ion battery are carefully investigated. The structure and phase formation of the prepared glasses, 0.3MnO2-0.7(LixBO2) with x = 0.25, 0.50, 0.75 and 1.00, were characterized using X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), and X-ray photoelectron spectroscopy (XPS) techniques. All XRD patterns present broad and no detectable peaks which confirmed purely amorphous phase. The CV curves exhibit pseudo-capacitance behavior indicating the mixed oxidation state of Mn2+/Mn3+ corresponding to Mn K-edge results measured by X-ray absorption near edge structure (XANES). The average Mn–O bonding distance was found in the range of 2.08–2.14 Å. SEM and TEM depict the existence of elements and confirm the glassy state of the obtained glass samples. The optical, magnetic, and electrochemical properties of these glasses have been also investigated. Paramagnetic behaviors are found for glass samples with x = 0.25, 0.50 and 0.75, respectively. Unlike other glass samples, the weak ferromagnetic was found at x = 1.0 composition. Interestingly, the highest specific capacitance value of 52 F g−1 is also obtained for 0.3MnO2-0.7(Li1.0BO2) glass suggesting a new promising glass electrode in future Li-ion battery.