Preparation of LiFePO4/C Cathode Materials by Hydrothermal Mathod

• Main Authors: Hsu,Yu-Cheng, 許郁承
• Other Authors: Chien,Wen-Chen
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/y44rf4

碩士 === 明志科技大學 === 化學工程系碩士班 === 103 === In this study, carbon-coated lithium iron phosphate (LiFePO4) cathode materials were synthesized by hydrothermally from LiOH, FeSO4 and H3PO4 as raw materials in aqueous solution at 180 °C for 3 h followed by being annealed at 600 °C for 10 h under a 95%Ar+5%H2 atmosphere. Then, the glucose aqueous solution was mixed with LiFePO4 powders and dried at 120 °C for 12 h. The dried powders were annealed at 600 °C for 10 h to obtain the lithium iron phosphate/carbon (LiFePO4/C) cathode composites. The structural, morphological and electrochemical properties were investigated by means of X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, Raman scattering spectra, and constant current charge–discharge cycling test. The results show that the specific discharge capacities at 0.1C is 94 mAh/g. And the spray drying was applied in the carbon-coating process, the specific discharge capacities at 0.1C can be promoted to 139 mAh/g.