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    • Keywords

       

      Lithium ion batteries; LiNi0.4M0.1Mn1.5O4 (𝑀 = Al, Bi); cyclic voltammetry; a.c.-impedance; charge/discharge.

    • Abstract

       

      In order to improve the cycling performance of LiMn2O4 based cathode materials, we have synthesized a new composition, LiNi0.4M0.1Mn1.5O4 (𝑀 = Al, Bi), by the sol–gel method. The formation of solid solutions is confirmed by structural characterization using TG/DTA, XRD, FT–IR, EPR, SEM and EPR. A.c.-impedance (Nyquist plot) showed a high frequency semicircle and a sloping line in the low-frequency region. The semicircle is ascribed to the Li-ion migration through the interface from the surface layer of the particles to the electrolyte. Cyclic voltammogram (between 3.5 and 4.9 V) for these materials using CR2032 coin-type cell shows two pairs of redox peaks corresponding to two-step reversible intercalation process, wherein Li-ions occupy two different tetragonal 8a sites in spinel Li𝑥Mn2O4 (𝑥 < 1) lattice. The galvanostatic charge/discharge curves for 𝑀 = Al (77 mAh g-1) showed reasonably good capacity retention than that of 𝑀 = Bi (11 mAh g-1) at the end of 17th cycle.

    • Author Affiliations

       

      G P Nayaka1 J Manjanna1 K C Anjaneya1 P Manikandan2 P Periasamy2 V S Tripathi3

      1. Department of Industrial Chemistry, Kuvempu University, Shankaraghatta 577 451, India
      2. Central Electrochemical Research Institute, Karaikudi 630 006, India
      3. Chemistry Group, Bhabha Atomic Research Centre, Mumbai 400 085, India
    • Dates

       
  • Bulletin of Materials Science | News

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