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Synthesis of $LiCo_{1-x}Mn_xO_2$ from a low-temperature route and characterization as cathode materials in Li-ion cells

Suresh, P and Rodrigues, S and Shukla, AK and Vasan, HN and Munichandraiah, N (2005) Synthesis of $LiCo_{1-x}Mn_xO_2$ from a low-temperature route and characterization as cathode materials in Li-ion cells. In: Solid State Ionics, 176 (3-4). pp. 281-290.

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Abstract

Manganese-substituted lithium–cobalt oxides, $LiCo_{1-x}Mn_xO_2 \hspace {3mm}(0 \leq x \leq 0.5)$, have been rapidly synthesized at $350 ^o C$ by a solution combustion method using diformyl hydrazine (DFH) as a fuel. Physical properties of these compounds are discussed in the light of structural [X-ray diffraction (XRD) and scanning electron miscroscope (SEM)] and spectroscopic (FTIR and Raman) studies. The samples with $x < 0.3$ are indexed in $R \bar{3} m$ space group having a layered structure and the samples with $x \geq 0.3$ in Fd3m space group with a modified spinel structure. Electrochemical characterization of these samples has been studied using cyclic voltammetry, galvanostatic charge–discharge cycling in the potential range 3–4.5 V and impedance spectroscopy. Specific capacity of the compound with x=0.2 has been found to be about $138 mA \hspace {2mm} h \hspace {2mm}g^{-1}$. With an increase in x, the capacity decreases and reaches about $80 mA \hspace {2mm} h \hspace {2mm} g^{-1}$ at x=0.5. From impedance spectroscopy, it has been found that the charge-transfer resistance is minimum for the sample with x=0.2, which supports the charge–discharge cycling data.

Item Type: Journal Article
Additional Information: The Copyright belongs to Elsevier.
Keywords: AC impedance;Combustion synthesis;Cyclic voltammetry;FTIR spectroscopy;Lithium–manganese–cobalt oxide;Raman spectroscopy
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 28 Mar 2006
Last Modified: 19 Sep 2010 04:24
URI: http://eprints.iisc.ernet.in/id/eprint/5854

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