Composition optimization of layered lithium nickel manganese cobalt oxide materials synthesized via ultrasonic spray pyrolysis

Miklos Lengyel, Xiaofeng Zhang, Gal Atlas, Hope L. Bretscher, Ilias Belharouak, Richard L. Axelbauma

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Lithium-rich, layered composites of xLi2MnO3· (1-x). Li(Ni1/3Mn1/3Co1/3)O2 were synthesized via spray pyrolysis to identify the chemistry yielding optimal electrochemical performance for materials produced by this method. The x values selected for optimization were x = 0.3, 0.5, 0.7, equivalent to Li 1.14Mn0.46Ni0.2Co0.2O2, Li1.2Mn0.54Ni0.13Co0.13O 2 and Li1.26Mn0.6Ni0.07Co 0.07O2, respectively. The materials were annealed at 850°C or 900°C for 2 hours, and then tested in coin cells. Li 1.2Mn0.54Ni0.13Co0.13O2 annealed at 900°C displayed the best electrochemical performance with excellent capacity retention, displaying a reversible capacity of 236 mAhg ?1 after 100 cycles when cycled between 2.0-4.8 V at C/10 rate, where 1C = 280 mAg?1. The cycling profiles display voltage fade, presumably due to a layered-spinel phase transformation. The synthesis method leads to high purity and excellent uniformity at the nanoscale, and the materials have less voltage fade compared to similar materials produced by co-precipitation. Voltage fade is more pronounced when the upper cut-off voltage is 4.8 V, as opposed to 4.6 V. A decrease in the Li2MnO3 content of the material reduces voltage fade, such that x = 0.3 (or Li 1.14Mn0.46Ni0.2Co0.2O2) shows the best structural stability over cycling.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume161
Issue number9
DOIs
Publication statusPublished - 1 Jan 2014

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cobalt oxides
Spray pyrolysis
manganese oxides
Manganese
Nickel
Lithium
pyrolysis
sprayers
Cobalt
lithium
ultrasonics
Ultrasonics
nickel
optimization
Oxides
Electric potential
electric potential
Chemical analysis
cycles
structural stability

ASJC Scopus subject areas

  • Electrochemistry
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics

Cite this

Composition optimization of layered lithium nickel manganese cobalt oxide materials synthesized via ultrasonic spray pyrolysis. / Lengyel, Miklos; Zhang, Xiaofeng; Atlas, Gal; Bretscher, Hope L.; Belharouak, Ilias; Axelbauma, Richard L.

In: Journal of the Electrochemical Society, Vol. 161, No. 9, 01.01.2014.

Research output: Contribution to journalArticle

Lengyel, Miklos ; Zhang, Xiaofeng ; Atlas, Gal ; Bretscher, Hope L. ; Belharouak, Ilias ; Axelbauma, Richard L. / Composition optimization of layered lithium nickel manganese cobalt oxide materials synthesized via ultrasonic spray pyrolysis. In: Journal of the Electrochemical Society. 2014 ; Vol. 161, No. 9.
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