Paper Title
Preparation Of Lifepo4 Cathode Materials By Hydrothermal Method

Abstract
In this study, ferrous sulfate, phosphoric acid, and lithium hydroxide, were used as raw materials to synthesize lithium iron phosphate/carbon (LiFePO4/C) cathode materials by using the hydrothermal method under the addition of 5-6wt% glucose as a carbon source and Li: Fe: P molar ratio of 1: 1: 3. The carbon coating procedure was carried out by calcining at 650°C with 95% argon/5% hydrogen atmosphere for 10 hours. The effect of the operating conditions for synthesis on the properties of lithium iron phosphate cathode material was tested by adding ascorbic acid (vitamin C), removing impurity by washing/filtering, controlling pH value. SEM images showed that adding carbon sources during the preparation of LiFePO4/C could reduce the particle size and improve the electrochemical performance. In addition, properly controlling pH and carefully washing/filtration steps could also improve the electrochemical performance of LiFePO4/C cathode material due to the better chemical purity. The results showed that the discharge capacity at different C-rates for LiFePO4/C prepared under the addition of 1g ascorbic acid and pH=6.0 were 127 mAh/g at 0.1C/0.1C; 100 mAh/g at 0.2C/0.2C, 40mAh/g at 0.2C/10C, respectively. Index Terms- Lithium iron phosphate, Hydrothermal method, Cathode material, Lithium ion battery