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 journalArticle

9 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 Jan 1
Externally publishedYes

Fingerprint

Spray pyrolysis
Powders
pyrolysis
sprayers
Cathodes
ultrasonics
cathodes
Ultrasonics
composite materials
Composite materials
cycles
Oxidation
oxidation
curves
low voltage
Nitrogen
nitrogen
atmospheres
shift
Electric potential

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

Cite this

Characteristics of Li2TiO3-LiCrO2 composite cathode powders prepared by ultrasonic spray pyrolysis. / Ko, You Na; Choi, Seung Ho; Kang, Yun Chan; Park, Seung Bin.

In: Journal of Power Sources, Vol. 244, 01.01.2013, p. 336-343.

Research output: Contribution to journalArticle

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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.",
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