Kalyani, P. and Kalaiselvi, N. and Muniyandi, N. (2003) On the Effects of Simultaneous Substitution of Al3¿ and B3¿ in LiNiO2 Cathodes. Journal of the Electrochemical Society, 150 (6). A759-A764. ISSN 0013-4651

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A series of solid solutions of the formula LiNi0.7AlxByO2 with x 1 y 5 0.3, has been synthesized by adopting urea-nitrate solution combustion route. Two diamagnetic cations from the same non-transition metal group viz., Al13 and B13 have been substituted simultaneously in to the crystal lattice of LiNiO2 with a view to realize the combined advantages such as over-charge protection and longer cycle life respectively. The synthesized cathode materials were characterized in the light of diffraction ~XRD!, spectroscopic ~Fourier transform infrared, FTIR! and electrochemical ~CV and charge/discharge! analyses. It is manifested from XRD that the observed correlation between the amount of boron substituted and the requirement of heat-treating conditions such as heating time and temperature implied that the B13 dopant plays a dual role, both as a dopant and as a flux. The dwelling time and the treating temperature required for the formation of phase pure LiNi0.7AlxByO2 compounds, either with a comparatively higher amount of boron with respect to Al or with the presence of maximum amount of B to the extent of 30% without Al were found to decrease as a function of boron content. The results of the XRD and FTIR studies established the complete mixing of Al and B with Ni, especially at the various levels and combinations of dopants attempted in the present study. The stabilization of Ni in the 13 state and the existence of enhanced two-dimensional structure without any cation mixing have been achieved through this novel attempt of simultaneous substitution of diamagnetic cations viz., Al31 and B31 in the layered LiNiO2 matrix, as evidenced from the CV studies. The effect and the extent of substitution of Ni with Al and B on the structural and electrochemical performance of LiNi0.7AlxByO2 are discussed elaborately in this communication.

Item Type: Article
Subjects: Lithium batteries
Depositing User: ttbdar CECRI
Date Deposited: 21 Feb 2012 02:45
Last Modified: 21 Feb 2012 02:45
URI: http://cecri.csircentral.net/id/eprint/887

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