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Nanostructured lithium-free oxyanion cathode, LixCo2(MoO4)(3) [0 <= x < 3] for 3 V class lithium batteries

K. M., Begam and M. S., Michael and S. R. S., Prabaharan (2008) Nanostructured lithium-free oxyanion cathode, LixCo2(MoO4)(3) [0 <= x < 3] for 3 V class lithium batteries. In: 4th International Conference on Materials for Advanced Technologies, JUL 01-06, 2007, Singapore.

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Abstract

Abstract: A new nanostructured framework-type polyanion material, Li (x) Co-2(MoO4)(3) [0 <= x < 3], was studied as a positive electrode for use in 3-Volt class lithium-ion cells for the first time. The new material was synthesized in a lithium-free composition and examined its structure, morphology, and electrochemical characteristics. Co-2(MoO4)(3) was found to crystallize in a monoclinic structure with lattice parameters: a=14.280(9) angstrom, b=3.382(8) angstrom, c=10.557(1) angstrom, and beta=117.9728 (space group P2/m). The redox behavior of this new material was demonstrated in lithium-containing test cells. The material offered a discharge capacity of approximately 110 mAh g(-1) between 3.5 and 1.5 V during the first cycle and retained 50% capacity at the end of the 20th cycle. The poor capacity retention is obviously attributed to the poor electronic conductivity of Co-2(MoO4)(3) owing to its open framework structure. To overcome the intrinsic low electronic conductivity of polyanion materials, we have adapted a nanocomposite approach by way of adding nanoporous carbon matrix (particle size approximately 10 nm) together with the conventional conductive additive (acetylene black) and demonstrated that the overall electronic conductivity could be improved significantly, yielding an initial discharge capacity of 121 mAh g(-1) using nanocomposite electrode in the potential range 3.5 V down to 2.0 V.

Item Type:Conference or Workshop Item (Paper)
Impact Factor:Cites in 2009 to articles published in: 2008 = 308 Number of articles published in: 2008 = 185 2007 = 404 2007 = 206 Sum: 712 Sum: 391 Calculation: Cites to recent articles 712 = 1.821 Number of recent articles 391
Uncontrolled Keywords:Electrochemistry
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments / MOR / COE:Departments > Electrical & Electronic Engineering
ID Code:2351
Deposited By: Mr Helmi Iskandar Suito
Deposited On:23 Jun 2010 12:15
Last Modified:19 Jan 2017 08:26

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