Characteristics of Li2TiO3-LiCrO2 composite cathode powders prepared by ultrasonic spray pyrolysis

You Na Ko, Seung Ho Choi, Yun Chan Kang, Seung Bin Park

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Li2TiO3-LiCrO2 cathode powders of various compositions are prepared by spray pyrolysis. Pure Li2TiO3 powder and Li2TiO3-LiCrO2 composite cathode powder have a spherical shape, nonaggregated structure, and fine sizes even after post-treatment at 700 °C under nitrogen atmosphere. The optimum posttreatment temperature to obtain composite powders with high initial discharge capacity, high coulombic efficiency, and good cycle properties is 700 °C. The initial charge capacities increase when the LiCrO2 content of the composite increase. However, the 0.55Li2TiO3-0. 45LiCrO2 composite cathode powders have the highest initial discharge capacity of 203 mAh g-1, in which the capacity retention after 30 cycles is 96%. The dQ/dV curve of the first charge curve has a distinct oxidation peak at approximately 3.9 V, which corresponds to Cr oxidation. The oxidation peak shifts to a lower voltage range at approximately 3.6 V after the first cycling because an irreversible reaction takes place in the initial charge process. The composite cathode powders with low LiCrO2 content have low initial charge/discharge capacities and good cycle properties because of the stabilizing effect of high amounts of an inactive Li2TiO3 component.

Original languageEnglish
Pages (from-to)336-343
Number of pages8
JournalJournal of Power Sources
Volume244
DOIs
Publication statusPublished - 2013
Externally publishedYes

Keywords

  • Composite cathode
  • Lithium battery
  • Lithium-rich compounds
  • Spray pyrolysis

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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