In situ carbon coated Li2MnSiO4/C composites as cathodes for enhanced performance li-ion batteries

Akkisetty, B and M, Deepa and Rao, T N and Varadarajuc, U V (2012) In situ carbon coated Li2MnSiO4/C composites as cathodes for enhanced performance li-ion batteries. Journal of The Electrochemical Society, 159 (12). A1954-A1960. ISSN 0013-4651

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An in-situ carbon coated Li2MnSiO4/C composite was synthesized by a nanocomposite gel precursor route using starch as the carbon source. Our approach enabled a uniform coating of amorphous carbon on Li 2MnSiO4 with an orthorhombic crystalline structure, which was confirmed by electron microscopy, X-ray diffraction and Raman studies. Conducting-atomic force microscopy (C-AFM) images also revealed the presence of high current interconnected domains in the composite, indicating the ability of the carbon coating to facilitate electron movement. Galvanostatic charge-discharge studies demonstrated outstanding initial charge and discharge capacities, respectively, of 330 and 195 mAh g-1 at 0.05 C-rate for the composite, and after 30 cycles a reversible capacity of 115 mAh g -1 was retained. The electrochemical performance of the neat silicate was dismal (10.6 mAh g-1 at 0.05 C-rate), which again reiterated the role of carbon in improving the conduction and Li-ion storage capacity of the silicate. An insignificant change in charge transfer resistance, with cycling, as inferred from impedance spectroscopy illustrated that charge transfer and transport processes remain facile with cycling, thus demonstrating Li 2MnSiO4/C to be promising cathode Li-ion batteries.

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Item Type: Article
Uncontrolled Keywords: Charge and discharge capacities; Charge transfer resistance; Crystalline structure; Electrochemical performance; Galvanostatic charge discharges; Impedance spectroscopy; Interconnected domains; Reversible capacity
Subjects: Chemistry
Divisions: Department of Chemistry
Depositing User: Team Library
Date Deposited: 31 Oct 2014 08:38
Last Modified: 18 Oct 2017 09:55
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