Thirunakaran, R. and Sivashanmugam, A. and Gopukumar, S. and Dunnill, C.W. and Gregory, D.H. (2008) Studies on chromium/aluminium-doped manganese spinel as cathode materials for lithium-ion batteries—A novel chelated sol–gel synthesis. Journal of Material Processing Technology, 208 (1-3). pp. 520-531.

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Nanoparticles of LiMn2O4, LiCrxMn2−xO4 and LiAlxMn2−xO4 (x = 0.0–0.4) have been synthesized using either phthalic acid or fumaric acid as chelating agents, for the first time, through sol–gel method. These materials were characterized by thermo gravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Electrochemical performance of these materials was assessed to use as cathode material for lithium-ion batteries. XRD patterns ascertain the formation of the phase pure compounds. SEM images indicate the nanosized nature of the particles with uniform morphology and texture. Doping of Cr/Al with the spinel resulted to increased agglomeration. Cr-doped spinel delivers 138mAh/g while Al-doped spinel exhibit 139mAh/g at the first cycle reversible capacity. Doping of 0.1 Al spinel cells shows superior performance over the tested 10 cycles in terms of low capacity fading. Co-doped Li3−xCoxN (x = 0.40) has also been synthesized by solid-state method to use as anode material for lithium-ion batteries. Cells were assembled with the synthesized spinel cathodes and these cells delivered stable specific capacity with high columbic efficiency. Cyclic voltammograms of both spinels exhibit good oxidation and reduction peaks for Mn3+/Mn4+, Cr3+/Cr4+ and Al+/Al3+.

Item Type: Article
Uncontrolled Keywords: LiMn2O4; LiCrxMn2−xO4; LiAlxMn2−xO4; Li2.6Co0.4N; Sol–gel method; Lithium-ion battery
Subjects: Lithium batteries
Electrochemical Power Sources
Depositing User: ttbdu cecri
Date Deposited: 31 Mar 2012 11:25
Last Modified: 31 Mar 2012 11:25

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