Effect of Glucose on Structure and Properties of LiFePO₄ Cathode Material Prepared by Microwave Hydrothermal Method

• Main Authors: XIA Ao, YU Wan-ru, TAN Guo-qiang
• Format: Article
• Language: zho
• Published: Journal of Materials Engineering 2016-10-01
• Series: Journal of Materials Engineering
• Subjects: lithium iron phosphate; cathode material; microwave hydrothermal method; glucose
• Online Access: http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.10.010
• ISSN: 1001-4381; 1001-4381

Orthorhombic LiFePO₄/C composite material with olivine structure was prepared by microwave hydrothermal method using FeSO₄·7H₂O, LiOH·H₂O and H₃PO₄ as raw materials, with glucose as carbon source and modifier. The influence of glucose on the composition, structure, morphology and electrochemical performance of LiFePO₄ was investigated by means of XRD, SEM, EDS and constant current charge-discharge cycling. The results show that the as-obtained LiFePO₄/C exhibits stronger bonding among Fe, P and O atoms, finer particle size and improved electrochemical properties than the pristine LiFePO₄. From the SEM image, the LiFePO₄ is coated by carbon in the LiFePO₄/C composite. The LiFePO₄/C shows the initial discharge capacity of 125.6mAh/g at 0.1C. Even at a rate of 1.0C, it still can deliver a discharge capacity of 106.2mAh/g, the capacity retention is 91.3% after 30 cycles.