Electrochemical effects and magnetic properties of B substituted LiCoO2: Improving Li-battery performance


Oz E., ALTIN S., DEMİREL S., BAYRİ A., ALTIN E., Baglayan O., et al.

JOURNAL OF ALLOYS AND COMPOUNDS, cilt.657, ss.835-847, 2016 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 657
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1016/j.jallcom.2015.10.080
  • Dergi Adı: JOURNAL OF ALLOYS AND COMPOUNDS
  • Sayfa Sayısı: ss.835-847

Özet

LiCo(1-x)BxO(2) (x = 0, 0.125, 0.25, 0.375, 0.5, 0.75 and 1) samples were synthesized via solid state reactions. They were characterized by SEM, X-ray powder diffraction, FTIR, Raman, electrical and magnetic measurements. XRD data show impurity phases for x >= 0.25 samples due to boron content. Based on FTIR studies, the peak position of CoO6 shifts with increasing B content. The Raman spectra of LiCoO2 shows the presence of three broad bands, indicating the possible formation of spinel structure. The effective magnetic moments of the samples were calculated using Curie-Weiss law with temperature independent term. The M-H curves of x = 0.375 and 0.5 samples show very weak hysteresis loops. Effects of boron substitution on battery performance are also investigated. x = 0.125 and x >= 0.25 samples give promising results due to their enhanced reversibility of cycling compared to pristine LiCoO2. Capacity retentions for 100 cycles for x = 0, 0.125 and 0.25 samples are 22%, 81% and 83%, respectively. (C) 2015 Elsevier B.V. All rights reserved.