Electrochemical properties of LiNi0.8Co0.2-xAl xO2 prepared by a sol-gel method

Chang Joo Han, Jang Hyuk Yoon, Won Il Cho, Ho Jang

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91 Citations (Scopus)

Abstract

Prospective positive-electrode (cathode) materials for a lithium secondary battery, viz., LiNi0.8Co0.2-xAlxO2 (x = 0.00, 0.01, 0.03, and 0.05), were synthesized using a sol-gel method and the structural and electrochemical properties are examined by means of X-ray diffraction, cyclic voltammetry, and charge-discharge tests. The LiNi 0.8Co0.2-xAlxO2 maintains the α-NaFeO2-type layered structure regardless of the aluminium content in the range x ≤ 0.05. On the other hand, as the aluminium content is increased, the capacity retention of LiNi0.8Co 0.2-xAlxO2 is improved while initial discharge capacity is slightly decreased. Results also show that the current peaks on the cyclic voltammograms are diminished and merged on aluminium addition. This suggests that the improved cycle stability of LiNi0.8Co 0.2-xAlxO2 is due to suppression of the phase transition.

Original languageEnglish
Pages (from-to)132-138
Number of pages7
JournalJournal of Power Sources
Volume136
Issue number1
DOIs
Publication statusPublished - 2004 Sep 10

Keywords

  • LiNi CoAlO
  • Lithium secondary battery
  • Phase transition
  • Positive electrode
  • Sol-gel method

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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