Combustion-synthesized LiNi0.6Mn0.2Co 0.2O2 as cathode material for lithium ion batteries

Wook Ahn, Sung Nam Lim, Kyu Nam Jung, Sun Hwa Yeon, Kwang Bum Kim, Hoon Sub Song, Kyoung Hee Shin

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Abstract

A nitrate/urea mixture was used as fuel to simply combustion-synthesize LiNi0.6Co0.2Mn0.2O2 as a high-capacity cathode material for lithium ion batteries. The reaction formulas and physical properties of the resultant cathode materials sintered at various temperatures were examined using thermogravimetric analysis/simultaneous differential thermal analysis, X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectrometry, and inductively coupled plasma/atomic emission spectrometry. The influence of sintering temperature on the electrochemical performance was evaluated by analyzing the charge/discharge profiles and cycling and rate-capability performances. The LiNi 0.6Co0.2Mn0.2O2 cathode sintered at 800 °C exhibited a discharge capacity of 170 mA h g-1 measured at a constant 20 mA g-1, 98.2% capacity retention after 30 cycles, and better rate capability than the cathodes sintered at 700, 900, and 1000 °C. The experimental results suggest that the enhanced electrochemical performance of the LiNi0.6Co0.2Mn0.2O2 cathode sintered at 800 °C is attributable to the pure, well-organized layered structure containing few mixed cations and to the shorter diffusion path resulting from the uniformly distributed nanoparticles.

Original languageEnglish
Pages (from-to)143-149
Number of pages7
JournalJournal of Alloys and Compounds
Volume609
DOIs
Publication statusPublished - 2014 Oct 5

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All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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