Improvement of electrochemical stability of LiMn2O4 by CeO2 coating for lithium-ion batteries

Hyung Wook Ha, Nan Ji Yun, Keon Kim

Research output: Contribution to journalArticle

144 Citations (Scopus)

Abstract

CeO2-coated LiMn2O4 spinel cathode was synthesized using two-step synthesis method. All the samples exhibited a pure cubic spinel structure without any impurities in the XRD patterns. The results of the electrochemical performances on CeO2-coated electrode are compared to those of electrodes based on LiMn2O4 spinel without CeO2 coating. CeO2-coated LiMn2O4 cathode improved the cycling stability of the electrode. The capacity retention of 2 wt% CeO2-coated LiMn2O4 was more than 82% after 150 cycles between 3.0 and 4.4 V at room temperature and 82% after 40 cycles at elevated temperature of 60 °C. The amounts of dissolved manganese-ions in CeO2-coated LiMn2O4 significantly are smaller than pristine LiMn2O4 systems especially at elevated temperatures. Surface-modified LiMn2O4 can suppress the dissolution reaction of manganese-ions at elevated temperature and clearly improve the cyclability of the spinel LiMn2O4 cathode materials.

Original languageEnglish
Pages (from-to)3236-3241
Number of pages6
JournalElectrochimica Acta
Volume52
Issue number9
DOIs
Publication statusPublished - 2007 Feb 15

Keywords

  • Cathode materials
  • Cerium oxide
  • Coating
  • Lithium batteries
  • Spinel

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

Fingerprint Dive into the research topics of 'Improvement of electrochemical stability of LiMn<sub>2</sub>O<sub>4</sub> by CeO<sub>2</sub> coating for lithium-ion batteries'. Together they form a unique fingerprint.

  • Cite this