Synthesis and Electrochemical Characterizations of Al Gradient-doped LiCoO2 Cathode Material

• Main Authors: Jhang, Bing-Cheng, 張秉丞
• Other Authors: Mao-Huang Liu
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/y6p3pt

碩士 === 輔仁大學 === 化學系 === 107 === In this study, an Al gradient-doped LiCoO2 (LCO) cathode was prepared via chemical co-precipitation followed by calcination. The average doping concentration of Al in the Al(GD)-LCO was ~2 mol.% with ~4 mol.% on the particle surface. Al(GD)-LCO returned values for initial efficiency, rate capability and cycle-life that were superior to those of LCO. The AC-impedance and PITT results indicate that the Al-rich surface of Al(GD)-LCO reduced the charge-transfer resistance(Rct) and enhanced the diffusion of Li+ by minimizing the side reactions with the electrolyte. All the results showed that the Al gradient-doped LCO cathode material effectively improve the electrochemical performances of LCO cathode material at high voltage.