Enhancing the Lithium Ion Conductivity in Lithium Superionic Conductor (LISICON) Solid Electrolytes through a Mixed Polyanion Effect

Yue Deng, Christopher Eames, Benoit Fleutot, Rénald David, Jean Noël Chotard, Emmanuelle Suard, Christian Masquelier, M. Saiful Islam

Research output: Contribution to journalArticle

35 Citations (Scopus)
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Abstract

Lithium superionic conductor (LISICON)-related compositions Li4±xSi1-xXxO4 (X = P, Al, or Ge) are important materials that have been identified as potential solid electrolytes for all solid state batteries. Here, we show that the room temperature lithium ion conductivity can be improved by several orders of magnitude through substitution on Si sites. We apply a combined computer simulation and experimental approach to a wide range of compositions (Li4SiO4, Li3.75Si0.75P0.25O4, Li4.25Si0.75Al0.25O4, Li4Al0.33Si0.33P0.33O4, and Li4Al1/3Si1/6Ge1/6P1/3O4) which include new doped materials. Depending on the temperature, three different Li+ ion diffusion mechanisms are observed. The polyanion mixing introduced by substitution lowers the temperature at which the transition to a superionic state with high Li+ ion conductivity occurs. These insights help to rationalize the mechanism of the lithium ion conductivity enhancement and provide strategies for designing materials with promising transport properties.

Original languageEnglish
Pages (from-to)7050-7058
Number of pages9
JournalACS Applied Materials and Interfaces
Volume9
Issue number8
DOIs
Publication statusPublished - 1 Mar 2017

Keywords

  • diffusion mechanism
  • energy storage
  • LISICON
  • mixed polyanion effect
  • solid electrolyte

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