Effects of surface modification on the cycling stability of LiNi 0.8Co0.2O2 electrodes by CeO2 coating

Hyung Wook Ha, Kyung Hee Jeong, Nan Ji Yun, Ming Zi Hong, Keon Kim

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48 Citations (Scopus)

Abstract

A high-performance LiNi0.8Co0.2O2 cathode was successfully fabricated by a sol-gel coating of CeO2 to the surface of the LiNi0.8Co0.2O2 powder and subsequent heat treatment at 700 °C for 5 h. The surface-modified and pristine LiNi0.8Co0.2O2 powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), slow rate cyclic voltammogram (CV), and differential scanning calorimetry (DSC). Unlike pristine LiNi0.8Co0.2O2, the CeO 2-coated LiNi0.8Co0.2O2 cathode exhibits no decrease in its original specific capacity of 182 mAh/g (versus lithium metal) and excellent capacity retention (95% of its initial capacity) between 4.5 and 2.8 V after 55 cycles. The results indicate that the surface treatment should be an effective way to improve the comprehensive properties of the cathode materials for lithium ion batteries.

Original languageEnglish
Pages (from-to)3764-3769
Number of pages6
JournalElectrochimica Acta
Volume50
Issue number18
DOIs
Publication statusPublished - 2005 Jun 10

Keywords

  • CeO coating
  • LiNiCoO
  • Lithium batteries
  • Sol-gel synthesis
  • Surface modification

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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