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Enhancing Lithium Conductivity Using High-Valence Cations in Cubic Spinel Halide Solid Electrolytes.

Taegon Jeon1, Sung Chul Jung1

  • 1Department of Physics, Pukyong National University, Busan 48513, Republic of Korea.

ACS Applied Materials & Interfaces
|August 30, 2024
PubMed
Summary

This study reveals Li2Sc2/3Cl4, a halide solid electrolyte, exhibits high ionic conductivity due to disordered Li ion distribution and active diffusion. Designing materials with high-valence cations can enhance conductivity in solid-state batteries.

Keywords:
all-solid-state batterycubic spinel structuredensity functional theoryhalide solid electrolytelithium conductivity

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Physics

Background:

  • Halide solid electrolytes are emerging as promising alternatives for all-solid-state batteries.
  • Their electrochemical properties rival those of traditional oxide and sulfide electrolytes.
  • Understanding ion dynamics is crucial for optimizing battery performance.

Purpose of the Study:

  • To investigate the ionic conductivity and diffusion mechanisms in Li2Sc2/3Cl4, a cubic spinel halide material.
  • To compare the Li ion dynamics in Li2Sc2/3Cl4 with Li2MgCl4.
  • To elucidate the factors governing superionic conductivity in halide solid electrolytes.

Main Methods:

  • Ab initio calculations were employed to study the dynamic nature of Li ions.
  • Analysis of Li ion occupation sites (8a, 16c, 16d) and diffusion pathways.
  • Comparison of conductivity mechanisms (single-ion vs. concerted diffusion) and cation blocking effects.

Main Results:

  • Li2Sc2/3Cl4 exhibits a high ionic conductivity of 1.36 mS cm-1 due to disordered Li distribution and active diffusion across multiple sites.
  • Unlike Li2MgCl4, Li ions in Li2Sc2/3Cl4 actively diffuse through the 16d site, a key factor for its superior conductivity.
  • Lower concentration of Sc3+ cations in Li2Sc2/3Cl4 compared to Mg2+ in Li2MgCl4 reduces blocking of Li ion movement.

Conclusions:

  • Site-dependent Li mobility significantly influences conductivity in halide solid electrolytes.
  • Designing cubic spinel materials with high-valence cations can enhance Li ion conductivity by minimizing diffusion pathway obstruction.
  • This research provides insights into controlling conductivity through targeted material design for advanced solid-state batteries.