The effects of adding In3+, Sn4+, and SnO2 on the Electrochemical Properties of LiNi0.8Co0.2O2 Cathode

• Main Authors: Kuo-shun Yang, 楊國順
• Other Authors: Yung-jen Lin
• Format: Others
• Language: en_US
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/92560043608779633123

碩士 === 大同大學 === 材料工程學系(所) === 93 === LiNi0.8Co0.2O2 powders are prepared by co-precipitation method and heat treatment at 800℃ for 8 hours under O2 atmosphere. In order to improve the electrochemical cycling behavior, I use two processes to modify the properties of the powder. One is doping the transition metal ions such as In or Sn ions to prepare the LiNi0.8Co0.2-xMxO2 powders. The other one is adding SnO2 into the LiNi0.8Co0.2O2 powders. The sample of LiNi0.8Co0.2-xInxO2 with x value of 0.05 has larger initial discharge capacity than LiNi0.8Co0.2O2 cathode, but the capacity fading is also larger. The sample of LiNi0.8Co0.2-xSnxO2 with x value of 0.02 has the largest initial discharge capacity of 181 mAh/g with C/10 rate at 30℃ and shows the best cycling performance (fading rate = 17.1%) than the other cathodes. The sample of SnO2/LiNi0.8Co0.2O2 with 0.56 wt% of SnO2 addition has the larger initial discharge capacity and better capacity fading than LiNi0.8Co0.2O2 cathode. The SEM is used to observe the powder surface and particle sizes. The particle sizes of LiNi0.8Co0.2-xSnxO2 powders are smaller than other powders.