Enhanced cyclability of triple-metal-doped LiMn2O4 spinel as the cathode material for rechargeable lithium batteries


Goktepe H., Sahan H., PATAT Ş., ÜLGEN A.

IONICS, vol.15, no.2, pp.233-239, 2009 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 15 Issue: 2
  • Publication Date: 2009
  • Doi Number: 10.1007/s11581-008-0265-5
  • Journal Name: IONICS
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.233-239
  • Keywords: Lithium-ion battery, Substituted LiMn2O4, Oxide cathodes, Triple-metal doping, Electrochemical properties, MANGANESE OXIDE SPINEL, X-RAY-DIFFRACTION, ELECTROCHEMICAL CHARACTERIZATION, INTERCALATION CATHODES, PERFORMANCE, LI, CO, PHASE, AL, SUBSTITUTION

Abstract

To improve the cycle performance of spinel LiMn2O4 as the cathode of 4-V-class lithium secondary batteries, spinel phases LiM (x) Mn2 -aEuro parts per thousand x O-4 (M=Li, Fe, Co; x = 0, 0.05, 0.1, 0.15) and LiFe0.05M (y) Mn1.95 -aEuro parts per thousand y O-4 (M=Li, Al, Ni, Co; y = 0.05, 0.1) were successfully prepared using the sol-gel method. The spinel materials were characterized by powder X-ray diffraction (XRD), elemental analysis, and scanning electron microscopy. All the samples exhibited a pure cubic spinel structure without any impurities in the XRD patterns. Electrochemical studies were carried out using the Li|LiM (x) Mn2 -aEuro parts per thousand x O-4 (M=Li, Fe, Co; x = 0, 0.05, 0.1, 0.15) and LiFe0.05M (y) Mn1.95 -aEuro parts per thousand y O-4 (M=Li, Al, Ni, Co; y = 0.05, 0.1) cells. These cathodes were more tolerant to repeated lithium extraction and insertion than a standard LiMn2O4 spinel electrode in spite of a small reduction in the initial capacity. The improvement in cycling performance is attributed to the stabilization in the spinel structure by the doped metal cations.