Analysis Of Micro-Raman Spectroscopy and Optical Band Gap Energy Of LiMnxFe1-xPO4 Cathode Materials Prepared According To Hydrothermal Route

• Main Authors: Huynh, Dang Chinh, Trinh, Viet Dung, Nguyen, Thi Tuyet Mai
• Format: Article
• Language: Vietnamese
• Published: H. : ĐHQGHN 2020
• Subjects: Lithium-ion batteries; LiMnxFe1-xPO4 cathode; LiFePO4; LiMnPO4; 170 mAh/g capacity
• Online Access: http://repository.vnu.edu.vn/handle/VNU_123/89464
• Institution: Vietnam National University, Hanoi

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 2 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 3 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.