Relationship between phase transition involving cationic exchange and charge-discharge rate in Li2FeSiO4

Titus Masese, Yuki Orikasa, Cédric Tassel, Jungeun Kim, Taketoshi Minato, Hajime Arai, Takuya Mori, Kentaro Yamamoto, Yoji Kobayashi, Hiroshi Kageyama, Zempachi Ogumi, Yoshiharu Uchimoto

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

Li2FeSiO4 is considered a promising cathode material for the next-generation Li-ion battery systems owing to its high theoretical capacity and low cost. Li2FeSiO4 exhibits complex polymorphism and undergoes significant phase transformations during charge and discharge reaction. To elucidate the phase transformation mechanism, crystal structural changes during charge and discharge processes of Li 2FeSiO4 at different rates were investigated by X-ray diffraction measurements. The C/50 rate of lithium extraction upon initial cycling leads to a complete transformation from a monoclinic Li 2FeSiO4 to a thermodynamically stable orthorhombic LiFeSiO4, concomitant with the occurrence of significant Li/Fe antisite mixing. The C/10 rate of lithium extraction and insertion, however, leads to retention of the parent Li2FeSiO4 (with the monoclinic structure as a metastable phase) with little cationic mixing. Here, we experimentally show the presence of metastable and stable LiFeSiO4 polymorphic phases caused by lithium extraction and insertion. © 2014 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)1380-1384
Number of pages5
JournalChemistry of Materials
Volume26
Issue number3
DOIs
StatePublished - Feb 11 2014
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2022-09-13

ASJC Scopus subject areas

  • Materials Chemistry
  • General Chemical Engineering
  • General Chemistry

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