Nanostructured Garnet-Type Solid Electrolytes for Lithium Batteries: Electrospinning Synthesis of Li7La3Zr2O12 Nanowires and Particle Size-Dependent Phase Transformation

Ting Yang, Zachary D. Gordon, Ying Li, Candace K. Chan

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Lithium lanthanum zirconate (LLZO) is a promising ceramic solid electrolyte for all-solid-state lithium batteries with improved safety characteristics. However, the different phases of LLZO differ in lithium ionic conductivity by several orders of magnitude, with extrinsic dopants often required to stabilize the high conductivity cubic phase. Here we show that cubic LLZO can be stabilized at room temperature in nanostructured particles without the use of extrinsic dopants. LLZO nanowires were synthesized using electrospinning and formed cubic phase materials after only 3 h calcination at 700°C. Bulk LLZO with tetragonal structure was transformed to the cubic phase using particle size reduction via ball milling. Heating conditions that promoted particle coalescence and grain growth induced a transformation from the cubic to tetragonal phases in both types of nanostructured LLZO. Detailed structural characterizations with XRD and TEM were performed to understand the LLZO formation processes and phase transformations. This work demonstrates another strategy, namely the use of nanostructuring, as an alternative to extrinsic doping for obtaining cubic phase LLZO.

Original languageEnglish
Pages (from-to)14947-14953
Number of pages7
JournalJournal of Physical Chemistry C
Volume119
Issue number27
DOIs
Publication statusPublished - Jul 9 2015

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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