Structure and lithium transport pathways in Li2FeSiO4 cathodes for lithium batteries

A. Robert Armstrong, Navaratnarajah Kuganathan, M. Saiful Islam, Peter G. Bruce

Research output: Contribution to journalArticle

232 Citations (Scopus)

Abstract

The importance of exploring new low-cost and safe cathodes for large-scale lithium batteries has led to increasing interest in Li2FeSiO 4. The structure of Li2FeSiO4 undergoes significant change on cycling, from the as-prepared γs form to an inverse βII polymorph; therefore it is important to establish the structure of the cycled material. In γs half the LiO 4, FeO4, and SiO4 tetrahedra point in opposite directions in an ordered manner and exhibit extensive edge sharing. Transformation to the inverse βII polymorph on cycling involves inversion of half the SiO4, FeO4, and LiO4 tetrahedra, such that they all now point in the same direction, eliminating edge sharing between cation sites and flattening the oxygen layers. As a result of the structural changes, Li+ transport paths and corresponding Li-Li separations in the cycled structure are quite different from the as-prepared material, as revealed here by computer modeling, and involve distinct zigzag paths between both Li sites and through intervening unoccupied octahedral sites that share faces with the LiO4 tetrahedra.

Original languageEnglish
Pages (from-to)13031-13035
Number of pages5
JournalJournal of the American Chemical Society
Volume133
Issue number33
DOIs
Publication statusPublished - 24 Aug 2011
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Fingerprint Dive into the research topics of 'Structure and lithium transport pathways in Li<sub>2</sub>FeSiO<sub>4</sub> cathodes for lithium batteries'. Together they form a unique fingerprint.

Cite this