Nithya, C. and Thirunakaran, R. and Sivashanmugam, A. and Krithika, G.V.M. and Gopukumar, S. (2009) High-Capacity Sol-Gel Synthesis of LiNixCoyMn1-x-yO2 (0 e x, y e 0.5) Cathode Material for Use in Lithium Rechargeable Batteries. Journal of Physical Chemistry C, 113 (41). pp. 17936-17344. ISSN 1932-7447

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Abstract

Succinic acid assisted sol-gel synthesized layered LiNixCoyMn1-x-yO2 (0 e x, y e 0.5) materials have been studied as cathode materials for lithium rechargeable batteries. TG/DTA studies were performed on the gel precursor and suggest the formation of a layered phase around 400 °C. The gel precursor was calcined at 850 °C and characterized by means of X-ray diffraction and FT-IR analyses and reveals that all of the synthesized materials are found to be well-crystallized with an R-NaFeO2 layered structure. The effect of Co content on the surface morphology has been examined by scanning electron microscopy, and X-ray photoelectron spectroscopy studies indicate that the oxidation states of nickel, cobalt, and manganese are +2, +3, and +4, respectively. The electrochemical galvanostatic charge/discharge cycling behavior of the synthesized layered materials has been evaluated in the voltage range of 2.7-4.8 V at C/10 and C/5 rates using a 2016 coin-type cell using 1 M LiPF6 in 1:1 EC/DEC as electrolyte. LiCo0.1Ni0.4Mn0.5O2 cathode material delivered the highest average discharge capacity of ∼175 mAh/g at a C/10 rate, corresponding to a current density of 0.298 mA cm-2 over the investigated 50 cycles.

Item Type:	Article
Subjects:	Lithium batteries
Divisions:	UNSPECIFIED
Depositing User:	TTBD CECRI
Date Deposited:	23 Jan 2012 12:39
Last Modified:	23 Jan 2012 12:39
URI:	http://cecri.csircentral.net/id/eprint/548

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