ELECTROCHEMICAL CYCLING AND IMPEDANCE STUDIES OF COMPOUNDS, Li(MMn11/6)O4 (M = Mn1/6, Co1/6, (Co1/12Cr1/12)) PREPARED AT 650C
The compounds, Li(MMn11/6)O4 (M=Mn1/6, Co1/6, (Co1/12Cr1/12) were prepared by the polymer precursor route, followed by solid sate reaction at 650℃ for 6 h in air. The as prepared bare and doped compounds were characterized by Rietveld refined X-ray diffraction (XRD), Scanning electron microscopy (SEM), density and Brauner, Emmet and Teller (BET) measurements. Bare and doped samples show a pure spinel phase and without any impurities. SEM studies of the bare and doped compounds show the particle sizes are in the range of 50-100 nm. Cyclic voltammetry and the galvanostatic studies are made in the voltage window of 3.5 to 4.3 V, at room temperature. The compound LiMn2O4 is found to obtain a reversible discharge capacity of 102 (±3) mAh/g at the end of 2nd cycle for 1C rate (assuming 1C=120 mA/g) with a capacity retention of 82 and 75%, between 2 to 500 and 2 to 1000 cycles, respectively. Co-doped LiMn2O4 deliver a reversible capacity of 82 (±3) mAh/g at the end of 1000 cycles, with good capacity retention of 94% at 1C rate. For the high current rate of 5C (600 mA/g), the bare compound showed a reversible discharge capacity of 82 mAh/g at the end of 2nd cycle and a capacity retention of 85% between 2 to 500 cycles. Further cycling studies on doped and impedance studies are discussed.
Polymer precursor method Cathode Co, Cr doped LiMn2O4 Lithium ion batteries
A. SAKUNTHALA M. V. REDDY S.SELVASEKARAPANDIAN B.V.R.CHOWDARI P. CHRISTOPHER SELVIN
Department of Physics, National University of Singapore, Singapore 117542 DRDO-BU-Centre for Life Sc Department of Physics, National University of Singapore, Singapore 117542 Kalasalingam University, Virudhunagar 626190, India NGM College, Pollachi, Tamilnadu, India
国际会议
The 12th Asian Conference on Solid State Ionics(第十二届亚洲固态离子学会议暨第十五届中国固态离子学会议)
武汉
英文
543-550
2010-05-02（万方平台首次上网日期，不代表论文的发表时间）