Surface Modification for Improving Electrochemical Properties in High-Voltage of LiNi0.8Co0.1Mn0.1O2 Cathode Materials

• Main Authors: LIN, YONG-JUN, 林詠竣
• Other Authors: LIN, HSIU-FEN
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/62w8sp

碩士 === 國立虎尾科技大學 === 材料科學與工程系材料科學與綠色能源工程碩士班 === 107 === LiNi0.8Co0.1Mn0.1O2 (NCM811) has the advantages of low cost and high energy density. Recently, in order to extend the applications of the cathode materials, the cut-off voltage of NCM811 is raised from 4.2V to 4.5V to increase energy density. However, the increase in voltage causes a collapse of the material structure and makes a rapid decadence in cycle life. In order to improve the electrochemical properties in high voltage of LiNi0.8Co0.1Mn0.1O2, many literatures have published the different methods, such as ion doping, surface coating, etc. This study will discuss the effects of different doping elements in high nickel cathode on the electrochemical performance, and also compare the efficacies between the different modification methods. It is expected to fine an effective methode and a better dopant to improve the charge and discharge performance and cycle life of NCM811 at 4.5V high voltage.