Browsing by Author "Arumugam, Sivashanmugam"

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    HIGH-PERFORMING LIMGXCUYCO1−X−YO2 CATHODE MATERIAL FOR LITHIUM RECHARGEABLE BATTERIES
    (American Chemical Society, 2012-08-22) Chandrasekaran, Nithya; Ramasamy, Thirunakaran; Arumugam, Sivashanmugam; Sukumaran, Gopukumar
    Sustainable power requirements of multifarious portable electronic applications demand the development of high energy and high power density cathode materials for lithium ion batteries. This paper reports a method for rapid synthesis of a cobalt based layered cathode material doped with mixed dopants Cu and Mg. The cathode material exhibits ordered layered structure and delivers discharge capacity of ∼200 mA h g–1 at 0.2C rate with high capacity retention of 88% over the investigated 100 cycles.
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    LICOXMN1-XPO4/C – A HIGH PERFORMING NANO COMPOSITE CATHODE MATERIAL FOR LITHIUM RECHARGEABLE BATTERIES
    (WILEY‐VCH Verlag, 2012-12-01) Chandrasekaran, Nithya; Ramasamy, Thirunakaran; Arumugam, Sivashanmugam; Sukumaran, Gopukumar
    Pristine and Co‐doped LiMnPO4 have been synthesized by the sol‐gel method using glycine as a chelating agent and the carbon composites were obtained by the wet ball mill method. The advantage of this method is that it does not require an inert atmosphere (economically viable) and facilitates a shorter time for synthesis. The LiCo0.09Mn0.91PO4/C nanocomposites exhibit the highest coulombic efficiency of 99 %, delivering a capacity of approximately 160 mAhg−1 and retain a capacity of 96.3 % over the investigated 50 cycles when cycled between 3–4.9 V at a charge/discharge rate of 0.1 C.
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    LICOXMN1-XPO4/C: A HIGH PERFORMING NANOCOMPOSITE CATHODE MATERIAL FOR LITHIUM RECHARGEABLE BATTERIES
    (An Asian Journal, 2011-10-14) Chandrasekaran, Nithya; Ramasamy, Thirunakaran; Arumugam, Sivashanmugam; Sukumaran, Gopukumar
    Pristine and Co-doped LiMnPO4 have been synthesized by the sol-gel method using glycine as a chelating agent and the carbon composites were obtained by the wet ball mill method. The advantage of this method is that it does not require an inert atmosphere (economically viable) and facilitates a shorter time for synthesis. The LiCo0.09Mn0.91PO4/C nanocomposites exhibit the highest coulombic efficiency of 99 %, delivering a capacity of approximately 160 mAhg−1 and retain a capacity of 96.3 % over the investigated 50 cycles when cycled between 3–4.9 V at a charge/discharge rate of 0.1 C.
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    NOVEL LI4TI5O12/SN NANO-COMPOSITES AS ANODE MATERIAL FOR LITHIUM ION BATTERIES
    (Elsevier, 2011-04) Arumugam, Sivashanmugam; Sukumaran, Gopukumar; Ramasamy, Thirunakaran; Chandrasekaran, Nithya; Shanmuga, Prema
    Li4Ti5O12/Sn nano-composites have been prepared as anode material for lithium ion batteries by high-energy mechanical milling method. Structure of the samples has been characterized by X-ray diffraction (XRD), which reveals the formation of phase-pure materials. Scanning electron microscope (SEM) and transmission electron microscope (TEM) suggests that the primary particles are around 100 nm size. The local environment of the metal cations is confirmed by Fourier transform infrared (FT-IR) and the X-ray photoelectron spectroscopy (XPS) confirms that titanium is present in Ti4+ state. The electrochemical properties have been evaluated by galvanostatic charge/discharge studies. Li4Ti5O12/Sn–10% composite delivers stable and enhanced discharge capacity of 200 mAh g−1 indicates that the electrochemical performance of Li4Ti5O12/Sn nano-composites is associated with the size and distribution of the Sn particles in the Li4Ti5O12 matrix. The smaller the size and more homogeneous dispersion of Sn particles in the Li4Ti5O12 matrix exhibits better cycling performance of Li4Ti5O12/Sn composites as compared to bare Li4Ti5O12 and Sn particles. Further, Li4Ti5O12 provides a facile microstructure to fairly accommodate the volume expansion during the alloying and dealloying of Sn with lithium.
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    NOVEL LI4TI5O12/SNNANO-COMPOSITES AS ANODE MATERIAL FOR LITHIUM ION BATTERIES
    (Elsevier, 2011-04-01) Arumugam, Sivashanmugam; Sukumaran, Gopukumar; Ramasamy, Thirunakaran; Chandrasekaran, Nithya; ShanmugaPrema
    Li4Ti5O12/Snnano-composites have been prepared as anode material for lithium ion batteries by high-energy mechanical milling method. Structure of the samples has been characterized by X-ray diffraction (XRD), which reveals the formation of phase-pure materials. Scanning electron microscope (SEM) and transmission electron microscope (TEM) suggests that the primary particles are around 100 nm size. The local environment of the metal cations is confirmed by Fourier transform infrared (FT-IR) and the X-ray photoelectron spectroscopy (XPS) confirms that titanium is present in Ti4+ state. The electrochemical properties have been evaluated by galvanostatic charge/discharge studies. Li4Ti5O12/Sn–10% composite delivers stable and enhanced discharge capacity of 200 mAh g−1 indicates that the electrochemical performance of Li4Ti5O12/Snnano-composites is associated with the size and distribution of the Sn particles in the Li4Ti5O12 matrix. The smaller the size and more homogeneous dispersion of Sn particles in the Li4Ti5O12 matrix exhibits better cycling performance of Li4Ti5O12/Sn composites as compared to bare Li4Ti5O12 and Sn particles. Further, Li4Ti5O12 provides a facile microstructure to fairly accommodate the volume expansion during the alloying and dealloying of Sn with lithium.