期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 809, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.151811
关键词
XAS; XANES; EXAFS; Manganese lithium borate glass
资金
- Synchrotron Light Research Institute (Public Organization), the SUT-NANOTEC-SLRI XAS beamline (BL5.2)
- Synchrotron Light Research Institute (Public Organization), the SUT-NANOTEC-SLRI XAS beamline (BL5.3)
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, 0.3MnO(2)-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 pseudocapacitance 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 angstrom. 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 0.3MnO(2)-0.7(Li1.0BO2) glass suggesting a new promising glass electrode in future Li-ion battery. (C) 2019 Elsevier B.V. All rights reserved.
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