Electrochemical properties of LiNi0.5Mn1.5O4 cathode after Cr doping

Sung Bin Park, Won Sob Eom, Won Il Cho, Ho Jang

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Abstract

The structure and electrochemical properties of Cr doped LiNi0.5-xMn1.5CrxO4 cathodes with different Cr contents (x = 0.00, 0.01, 0.03, and 0.05) were investigated by X-ray diffraction, SEM, cyclic voltammetry, charge-discharge tests, and thermogravimetric analysis. In particular, restoration of Li in the cathode during intercalation was carefully analyzed by employing heating-cooling cycles of thermogravimetric technique. Results showed that the initial discharge capacity and capacity retention of the LiNi0.5-xMn1.5CrxO4 cathode were improved as the Cr content was increased. Thermal analysis and CV test results suggested that the improvement of the electrochemical properties of the Cr doped LiNi0.5-xMn1.5CrxO4 cathode was attributed to the high oxygen affinity of the Cr, which reduced oxygen deficiency and improved structural stability of the cathode.

Original languageEnglish
Pages (from-to)679-684
Number of pages6
JournalJournal of Power Sources
Volume159
Issue number1 SPEC. ISS.
DOIs
Publication statusPublished - 2006 Sep 13

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Keywords

  • Chromium
  • Doping
  • LiNiMnO
  • Lithium-ion batteries

ASJC Scopus subject areas

  • Electrochemistry
  • Fuel Technology
  • Materials Chemistry
  • Energy (miscellaneous)

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