The Preparation of Lithium-ion Battery of Li2FeSiO4 Cathode Materials by Sol-gel Method

• Main Authors: Ze-Yu Chen, 陳澤榆
• Other Authors: Teh-Hua Tsai
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/dnh3z4

碩士 === 國立臺北科技大學 === 化學工程研究所 === 101 === Lithium iron silicate (Li2FeSiO4) is promising alternative cathode material because of its low material cost, superior thermal safety, environmental friendliness, long operational life and plausible extraction of more than one Li-ion per formula unit. However, because of its lattice structure, it has extremely low electronic conductivity and Li-ion diffusion coefficient, which has been overcome. In this study, we tried to use sol-gel method to synthesize Li2FeSiO4/C and searched for optimal synthetic process. It was synthesized using D-Fructose as carbon source, and effort of doping amount, calcination time, calcination temperature, and pH on Li2FeSiO4/C’s performance were systematically researched, and assembled coin cells to test the electrochemical performance. The result shows that particle size distribution is about 450nm , and using higher concentration of fructose, to prevent aggregation of inter-particle. Higher calcination temperature and 4℃/min heating rate allows the crystalline obvious, and low temperature generated impurity phase. It exhibit first charge capacity of 147mAh/g at 0.05C.