Browsing by Author "Lakshmi R"

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    EFFECT OF MG DOPANT ON THE ELECTROCHEMICAL PERFORMANCE OF LINI0.5MN0.5O2 CATHODE MATERIALS FOR LITHIUM RECHARGEABLE BATTERIES
    (IOP Publishing, 2010-06-16) Nithya C; Lakshmi R; Gopukumar S
    Positive electrode materials, LiMg x Ni0.5−x Co0.5O2 (x = 0 < x < 0.5), have been successfully synthesized by microwave-assisted solution technique. The precursor has been analyzed by TG/DTA and the powder was calcined at 850 °C. The XRD patterns reveal that the synthesized materials exhibit hexagonal layered structure corresponding to R3-m space group. Coin cells of 2016 type have been fabricated using the synthesized layered material as cathode active material and lithium foil used as counter and reference electrode. Test cells were operated in the potential limits between 2.7 and 4.3 V using 1 M LiPF6 in 1:1 EC/DEC as electrolyte. LiMg0.2Ni0.3Co0.5O2 material delivers an average discharge capacity of around 165 mA hg−1 at 0.1 C rate over the investigated 20 cycles.
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    SORET EFFECT ON UNSTEADY MHD FREE CONVECTIVE FLOW OVER AN INCLINED PLATE WITH HEAT AND MASS TRANSFER
    (PSGR Krishnammal college for women, A unit of GRG Trust, Coimbatore, 2020-02-25) Lakshmi R; Meenambigai R; Sweatha A.R
    The study was carried out to find an analytical solution of an unsteady MHD free convective flow over an inclined plate with heat and mass transfer by Soret effect. The free convective flow of an electrically conducting incompressible viscous fluid is embedded in a porous medium. The variation in temperature and mass diffusion was considered. The effects of pertinent parameters on velocity, temperature and concentration were discussed graphically and qualitatively. The results on various dimensionless parameters like Prandtl number (Pr), Schmidt number (Sc), Grashof number were also obtained graphically