Enhancement of battery performance of LiMn2O4: correlations between electrochemical and magnetic properties


DEMİREL S., Oz E., ALTIN S., BAYRİ A., ALTIN E., AVCI S.

RSC ADVANCES, cilt.6, ss.43823-43831, 2016 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 6 Konu: 49
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1039/c6ra05032h
  • Dergi Adı: RSC ADVANCES
  • Sayfa Sayısı: ss.43823-43831

Özet

We report the results of a systematic investigation of structural, electrical transport, magnetic, and electrochemical properties of LiBxMn2-xO4 (where x = 0.0-1), synthesized via a one-step solid state reaction technique. We find that the parent compound (x = 0) has the non-stoichiometric Li1.05Mn2O4 phase and the B ions successfully incorporate the structure for x <= 0.5. The resistivity anomaly of the parent compound below 100 K is attributed to the antiferromagnetic correlations. The linear part of the chi(-1)-T data are used to calculate the effective magnetic moments and to determine the total number of Mn3+ and Mn4+ ions. Magnetization measurements show that Jahn-Teller active Mn3+ ions have high spin configuration. Average valance of Mn ions increases with increasing boron content. Electrochemical studies show improved capacity retention for x = 0.125 for 100 charge-discharge cycles. This improvement is attributed to subtle modifications in the structural and magnetic properties upon substitution.