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      https://www.ias.ac.in/article/fulltext/boms/034/07/1693-1698

    • Keywords

       

      Lithium batteries; intercalation compounds; electrochemical characterization; diffusion.

    • Abstract

       

      Layered LiNi0.8Co0.2O2 crystallizing in 𝑅$\bar{3}$𝑚 space group is synthesized by decomposing the constituent metal–nitrate precursors. Oxidizing nature of metal nitrates stabilizes nickel in +3 oxidation state, enabling a high degree of cation ordering in the layered LiNi0.8Co0.2O2. The powder sample characterized by XRD Rietveld refinement reveals < 2% Li–Ni site exchange in the layers. Scanning electron microscopic studies on the as-synthesized LiNi0.8Co0.2O2 sample reflect well defined particles of cubic morphology with particle size ranging between 200 and 250 nm. Cyclic voltammograms suggest that LiNi0.8Co0.2O2 undergoes phase transformation on first charge with resultant phase being completely reversible in subsequent cycles. The first-charge-cycle phase transition is further supported by impedance spectroscopy that shows substantial reduction in resistance during initial de-intercalation. Galvanostatic charge–discharge cycles reflect a firstdischarge capacity of 184 mAh g-1 which is stabilized at 170 mAh g-1 over 50 cycles.

    • Author Affiliations

       

      M Sathiya1 K Hemalatha1 K Ramesha1 A K Shukla2 A S Prakash1

      1. CSIR – Central Electrochemical Research Institute – Chennai Unit, CSIR – Madras Complex, Chennai 600 113, India
      2. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India
    • Dates

       
  • Bulletin of Materials Science | News

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