• N Muniyandi

      Articles written in Bulletin of Materials Science

    • Solid-state synthesis and characterization of LiCoO2 and LiNiyCo1−y solid solutions

      P Periasamy B Ramesh Babu R Thirunakaran N Kalaiselvi T Prem Kumar N G Renganathan M Raghavan N Muniyandi

      More Details Abstract Fulltext PDF

      Solid solutions of compositions LiNiyCo1−yO2 (y = 0.0, 0.1 and 0.2) were prepared by solid-state fusion synthesis from carbonate precursors. Material characterization was carried out using XRD. Formation mechanisms of the products are discussed in the light of TG/DTA results. Nickel-containing compositions gave higher discharge capacities and smaller hystereses in their charge-discharge profiles which make them more attractive than pristine LiCoO2 as cathode materials in high-energy lithium cells. The lower loss in capacity per cycle for cells with unsubstituted LiCoO2, as determined from cycling studies up to 25 cycles, makes it more suitable than the substituted ones for long cycle-life cells with low capacity fade.

    • Electrochemical behaviour of LiM𝑦Mn2–𝑦O4(M = Cu, Cr; 0 𝑦 0 4)

      R Thirunakaran B Ramesh Babu N Kalaiselvi P Periasamy T Prem Kumar N G Renganathan M Raghavan N Muniyandi

      More Details Abstract Fulltext PDF

      Spinel lithium manganese oxide, LiMn2O4, is beset with problems of capacity fade upon repeated cycling. The loss in capacity upon cycling is attributable to Jahn–Teller distortion and manganese dissolution in the electrolyte in the charged state. One way to circumvent this capacity fade is to introduce other 3𝑑 transition metal ions in the LiMn2O4 lattice. In this paper, we report on the effect of partial substitution of manganese in the LiMn2O4 phase with copper (II) and chromium (III) ions. It has been shown that the higher octahedral stabilization energy of trivalent chromium imparts greater structural stability to chromium-doped LiMn2O4 spinels. Both copper and chromium reduce the capacity of the spinel in the 4 V region. In terms of its good reversible capacity and ability to sustain cycling with minimal capacity fade, LiCr0.1Mn1.9O4 may be considered as a potential cathode material for lithium rechargeable cells.

  • Bulletin of Materials Science | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2017-2019 Indian Academy of Sciences, Bengaluru.