Extending the Electrochemical Window of Na+ Halide Nanocomposite Solid Electrolytes for 5 V-Class All-Solid-State Na-Ion Batteries

Juhyoun Park, Daseul Han, Jun Pyo Son, Hiram Kwak, Wonseok Ko, Changhyun Park, Chanhee Lee, Hyun Wook Lee, Jongsoon Kim, Kyung Wan Nam, Yoon Seok Jung

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

This study introduces a Na+ fluorinated halide nanocomposite solid electrolyte (HNSE), ZrO2-2Na2ZrCl5F, synthesized through a mechanochemical reaction using Na2O. This HNSE exhibits a substantial improvement in Na+ conductivity (2.1 × 10-5 S cm-1 at 30 °C) compared to Na2ZrCl5F (2.0 × 10-7 S cm-1). The significant reduction in ionic conductivity of Na2ZrCl5F relative to Na2ZrCl6 (2.0 × 10-5 S cm-1) is elucidated through synchrotron pair distribution function (PDF) analysis. Structural insights, including the fine structure of the ZrO2 nanograins embedded in an amorphous Na2ZrCl5F matrix and the potential O-substituted interphase, are revealed through X-ray absorption spectroscopy, PDF, and cryogenic transmission electron microscopy. Fluorinated HNSEs offer exceptional electrochemical oxidative stability up to 5 V (vs Na/Na+), enabling high-voltage cathode applications. Na0.66Ni0.1Co0.1Mn0.8O2||Na3Sn all-solid-state cells using ZrO2-2Na2ZrCl5F as the catholyte demonstrate enhanced performance at 30 °C compared to cells using Na2ZrCl6 (47.4% capacity retention after 100 cycles vs 35.3% using Na2ZrCl6).

Original languageEnglish
Pages (from-to)2222-2230
Number of pages9
JournalACS Energy Letters
Volume9
Issue number5
DOIs
StatePublished - 10 May 2024

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