Analysis Of Micro-Raman Spectroscopy and Optical Band Gap Energy Of LiMnxFe1-xPO4 Cathode Materials Prepared According To Hydrothermal Route
Main Article Content
Abstract
LiMnxFe(1-x)PO4 olivine cathode material (x= 0.1; 0.2; 0.3 and 0.8) fabricated according to hydrothermal route. Micro-Raman spectroscopy, SEM scanning electron microscopy, UV-Vis absorption spectra and reflectance spectra methods were performed to study the characteristics of materials. The results showed that LiMnxFe(1-x)PO4 prepared materials were nano-meter in size (60-100 nm) and distorted sphere-like shape. The material has bands in the Raman spectrum corresponding to the position of the bands of the pure LiFePO4 and shift slightly. The band position at 410 cm-1 (corresponding to the position of the n2 band of the pure LiFePO4 sample) was attenuated of the sample in which Mn2+ ion content replaced Fe2+ ion content to 0.8 molar ratio. But the band position at 1020 cm-1 appeared with Strengthening intensity (corresponding to the position of the n3 band of the pure LiMnPO4 sample). The optical band gap energy of samples determined according to the Tauc equation in the range of 3.33-3.5 eV.
Keywords:
Lithium-ion batteries, LiMnxFe1-xPO4 cathode, LiFePO4, LiMnPO4, 170 mAh/g capacity.
References
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[8] Mauro Francesco Sgroi, Roberto Lazzaroni, David Beljonne and Daniele Pullini, Doping LiMnPO4 with Cobalt and Nickel: A First Principle Study, Batteries 3(11) (2017) 10 pages. https://doi.org/ 10.3390/batteries 3020011.
[9] Volkan S¸enay, Soner¨Ozen1, Suat Pat, and S¸adan Korkmaz, Optical and surface properties of LiFePO4 thin films prepared by RF magnetron sputtering, The European Physical Journal D 69(3) (2015) 69-76. https://doi.org/10.1140/epjd/e2015-50847-7.
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[13] Doan Hoang Anh, Trinh Viet Dung, Bui Doan Huan, Dang Thi Minh Hue, Nguyen Thi Tuyet Mai, Huynh Dang Chinh, Study hydrothermal fabrication and characteristics of LiMnxFe1-xPO4 material applied as a cathode for Lithium-ion battery, Vietnam Journal of chemistry 57(4e1,2) (2019) 198-203 (in Vietnamese).
[14] Bin Zhang, Xiaojian Wang, Hong Li, Xuejie Huang, Electrochemical performances of LiFe1-xMnxPO4 with high Mn content, Journal of Power Sources 196 (2011) 6992-6996. https://doi.org/10. 1016/j.jpowsour.2010.10.051.
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Marco S. Grandi, Vincenzo Massarotti, Structural, spectroscopic and magnetic investigation of the LiFe1-xMnxPO4 (x= 0-0.18) solid solution, Journal of Solid State Chemistry 182 (2009) 1972-1981. https://doi.org/10.1016/j.jssc.2009.05.016.