Surface modification of LiNi0.5Mn1.5O4 by ZrP2O7 and ZrO2 for lithium-ion batteries

H. M. Wu, I. Belharouak, A. Abouimrane, Y. K. Sun, K. Amine

Research output: Contribution to journalArticle

202 Citations (Scopus)

Abstract

The spinel LiNi0.5Mn1.5O4 has been surface modified separately with 1.0 wt.% ZrO2 and ZrP2O7 for the purpose of improving its cycle performance as a cathode in a 5-V lithium-ion cell. Although the modifications did not change the crystallographic structure of the surface-modified samples, they exhibited better cyclability at elevated temperature (55 °C) compared with pristine LiNi0.5Mn1.5O4. The material that was surface modified with ZrO2 gave the best cycling performance, only 4% loss of capacity after 150 cycles at 55 °C. Electrochemical impedance spectroscopy demonstrated that the improved performance of the ZrO2-surface-modified LiNi0.5Mn1.5O4 is due to a small decrease in the charge transfer resistance, indicating limited surface reactivity during cycling. Differential scanning calorimetry showed that the ZrO2-modified LiNi0.5Mn1.5O4 exhibits lower heat generation and higher onset reaction temperature compared to the pristine material. The excellent cycling and safety performance of the ZrO2-modified LiNi0.5Mn1.5O4 electrode was found to be due to the protective effect of homogeneous ZrO2 nano-particles that form on the LiNi0.5Mn1.5O4, as shown by transmission electron microscopy.

Original languageEnglish
Pages (from-to)2909-2913
Number of pages5
JournalJournal of Power Sources
Volume195
Issue number9
DOIs
Publication statusPublished - 1 May 2010

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Keywords

  • LiNiMnO
  • Lithium-ion batteries
  • ZrO coating
  • ZrPO coating

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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