Li2MTi6O14 (M = Sr, Ba): New anodes for lithium-ion batteries

I. Belharouak, K. Amine

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

Isostructural Li2MTi6O14 (M = Sr, Ba) materials, prepared by a solid state reaction method, have been investigated as insertion electrodes for lithium battery applications. These titanate compounds have a structure that consists of a three-dimensional network of corner- and edge-shared[TiO6] octahedra, 11-coordinate polyhedra for the alkali-earth ions, and [LiO4] tetrahedra in tunnels that also contain vacant tetrahedral and octahedral sites. Electrochemical data show that these compounds are capable of reversibly intercalating four lithium atoms in a three-stage process between 1.4 and 0.5 V vs. metallic lithium. The electrodes provide a practical capacity of approximately 140 mAh/g; they are, therefore, possible alternative anode materials to the lithium titanate spinel, Li4Ti5O12. The lithium intercalation mechanism and crystal structure of Li2MTi6O14 (M = Sr, Ba) electrodes are discussed and compared with the electrochemical and structural properties of Li4Ti5O12. The area-specific impedance (ASI) of Li/Li2SrTi6O14 cells was found to be significantly lower than that of Li/Li4Ti5O12 cells.

Original languageEnglish
Pages (from-to)435-438
Number of pages4
JournalElectrochemistry Communications
Volume5
Issue number6
DOIs
Publication statusPublished - 1 Jun 2003
Externally publishedYes

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Keywords

  • Anode
  • Lithium-ion batteries
  • Structure
  • Titanate

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

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