Comparative study of different crystallographic structure of LiNi0.5Mn1.5O4-δ cathodes with wide operation voltage (2.0-5.0 V)

S. H. Park, S. W. Oh, S. H. Kang, I. Belharouak, K. Amine, Y. K. Sun

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Abstract

LiNi0.5Mn1.5O4-δ cathode materials with two different structures (F d over(3, ̄) m and P4332) were synthesized by ultrasonic spray pyrolysis method. The X-ray diffraction (XRD) data was confirmed that face-centered spinel (F d over(3, ̄) m) transformed into primitive simple cubic (P4332) structure by annealing process at 700 °C. In spite of two electrons operated cut-off voltage range between 2.0 and 5.0 V, LiNi0.5Mn1.5O4 with P4332 structure has better electrochemical behaviors than the cathode with simple cubic F d over(3, ̄) m structure. Ex situ XRD study of the electrode revealed that LiNi0.5Mn1.5O4 (P4332) has reversible crystal transformation between fully lithiated state (2.0 V) and delithiated state (5.0 V) whereas LiNi0.5Mn1.5O4-δ (F d over(3, ̄) m) showed irreversible phase transformed at two voltage region. The LiNi0.5Mn1.5O4-δ (F d over(3, ̄) m) has voltage drop was occurred after 20th cycled compared without any voltage drop of the P4332 structure.

Original languageEnglish
Pages (from-to)7226-7230
Number of pages5
JournalElectrochimica Acta
Volume52
Issue number25
DOIs
Publication statusPublished - 1 Sep 2007

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Keywords

  • Cathode materials
  • Electrochemical properties
  • Li-ion battery
  • LiNiMnO
  • Spinel materials

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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