The Electrochemical Performance of Cathode Materials of Lithium Nickel Manganese Cobalt Oxide

• Main Authors: Teng-Chun Chen, 陳登峻
• Other Authors: Teh-Hua Tsai
• Format: Others
• Online Access: http://ndltd.ncl.edu.tw/handle/e8cxe3

碩士 === 國立臺北科技大學 === 化學工程與生物科技系化學工程碩士班（碩士在職專班） === 104 === This LiNi1/3Co1/3Mn1/3O2 cathode material contains less Cobalt of LiCoO2 by Nickel and Manganese. This material has some advantages of low cost, low pollution and structural stability, but its capacity is not enough, nowadays. This experiment study LiCo1/3Ni1/3Mn1/3O2 cathode material improved by Li-rich and Mn-rich to improve the cycle and charge/discharge performance. Using cobalt sulfate, nickel sulfate and manganese sulfate as a starting materials to make the precursor of Li1.2Ni1/3Co1/3Mn1/3O2 in the microwave reactor , and get the Li1.2Ni1/3Co1/3Mn1/3O2 powder by high temperature calcined. In this study, we have tried some variables: reaction temperature of microwave, Li-rich, and Mn-rich. We observe the crystallization, surface morphology, partical size,element composition and electrochemical performance by X-ray diffraction analysis, SEM/EDX, ICP-OES, DLS, and Electrochemical analyzer. According to the experiment, the best method to synthesize modified-Li1.2Ni1/3Co1/3Mn1/3O2 cathode material is continuous microwave at reaction temperature 220°C, two step calcinations : first calcined temperature at 450°C for 6 hours, second calcined temperature at 900°C for 10 hours, add to excess manganese and excess lithium can synthesize Li2MnO3, this can improve the electrochemical properties.