Improving ionic conductivity of von-Alpen-type NASICON ceramic electrolytes via magnesium doping

Il Seop Jang, Wooseok Go, Bo Ye Song, Hayoung Park, Yun Chan Kang, Jinyoung Chun

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

NASICON (sodium (Na) superionic conductor) compounds have attracted considerable attention as promising solid electrolyte materials for advanced Na-based batteries. In this study, we investigated the improvement in ionic conductivities of von-Alpen-type NASICON (vA-NASICON) ceramic electrolytes by introducing a magnesium ion (Mg2+) as a heterogeneous element. The optimal Mg-doped vA-NASICON exhibited a high ionic conductivity of 3.64×10−3 S·cm−1, which was almost 80% higher than that of un-doped vA-NASICON. The changes in physicochemical properties of the vA-NASICONs through the Mg introduction were systematically analyzed, and their effects on the ionic conductivities of the vA-NASICON were studied in detail. When the optimal ratio of Mg2+ was used in a synthetic process, the relative density (96.6%) and grain boundary ionic conductivity (σgb) were maximized, which improved the total ionic conductivity (σt) of the vA-NASICON. However, when Mg2+ was introduced in excess, the ionic conductivity decreased because of the formation of an undesired sodium magnesium phosphate (NaxMgyPO4) secondary phase. The results of this study are expected to be effectively applied in the development of advanced sodium-based solid electrolytes with high ionic conductivities.

Original languageEnglish
Pages (from-to)1058-1066
Number of pages9
JournalJournal of Advanced Ceramics
Volume12
Issue number5
DOIs
Publication statusPublished - 2023 May

Bibliographical note

Funding Information:
This work was supported by Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (20215610100040, Development of 20 Wh seawater secondary battery unit cell).

Publisher Copyright:
© The Author(s) 2023.

Keywords

  • NASICON
  • ionic conductivity
  • magnesium (Mg) doping
  • solid electrolyte
  • von-Alpen-type

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites

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