High-pressure synthesis and electrochemical behavior of layered (1-a)LiNi1-yAlyO2 center dot aLi[Li1/3Ni2/3]O-2 oxides

E Shinova, E Zhecheva*, R Stoyanova, GD Bromiley, R Alcantara, JL Tirado

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Layered (1 - a)LiNi(1-y)Al(y)O(2)center dot aLi[Li1/3Ni2/3]O-2 oxides, 0 1.2. While pure NiO2-layers are able to incorporate under highpressure up to 1/3Li, the appearance of Al in the NiO2-layers hinders Li+ dissolution (Li <(1-y)/3). In addition, with increasing Al content there is a strong cationic mixing between the layers. High-frequency EPR of Ni3+ indicates that the structural interaction of LiAlyNi1-yO2 with Li[Li1/3Ni2/3]O-2 proceeds via the formation of domains comprising different amount of Ni3+ ions. The use of Li1.08Al0.09Ni0.83O2 as a cathode material in a lithium ion cells displays a first irreversible Li extraction at 4.8V, after which a reversible lithium insertion/extraction between 3.0 and 4.5V is observed on further cycling. (c) 2005 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)2692-2700
Number of pages9
JournalJournal of Solid State Chemistry
Volume178
Issue number9
DOIs
Publication statusPublished - Sep 2005

Keywords

  • cathode materials
  • lithium nickelates
  • structural characterization
  • EPR spectroscopy
  • ION SHUTTLECOCK BATTERIES
  • CATHODE MATERIALS
  • LITHIUM BATTERIES
  • SOLID-SOLUTIONS
  • LIAL1/4NI3/4O2 R(3)OVER-BAR-M
  • ELECTRODE MATERIALS
  • CRYSTAL-STRUCTURE
  • LINIO2
  • PERFORMANCE
  • CELLS

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