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Fast Li-Ion Conduction in Spinel-Structured Solids.

Jan L Allen1, Bria A Crear2, Rishav Choudhury3

  • 1Energy Sciences Division, Sensors & Electron Devices Directorate, US Army Research Laboratory, Adelphi, MD 20783, USA.

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Summary
This summary is machine-generated.

Researchers explored "Li-stuffed" spinels for fast lithium-ion conduction, creating single-phase electrodes for advanced batteries. This approach enhances conductivity and eliminates interface issues in solid-state batteries.

Keywords:
Li-ion batterycathode-electrolyte interfacefast Li+ ion conductorsolid electrolytesolid-state batteryspinel

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Spinel structures are investigated for lithium-ion battery applications.
  • Achieving high ionic and electronic conductivity in solid electrodes is crucial for battery performance.
  • Multi-phase interfaces in composite electrodes can lead to impedance and performance degradation.

Purpose of the Study:

  • To investigate fast lithium-ion (Li+) conduction in "Li-stuffed" spinels.
  • To determine the applicability of Li-stuffed spinels in creating high mixed electronic-ionic conductive, electrochemically active solid solutions.
  • To enable single-phase fully solid electrodes, eliminating multi-phase interface incompatibility.

Main Methods:

  • Solid-state synthesis of Li-stuffed spinel materials with compositions Li1.25M(III)0.25TiO4 (M(III) = Cr or Al).
  • Characterization of ionic and electronic conductivity.
  • Preparation of electrochemically active solid solutions using Li-stuffed spinels.

Main Results:

  • A room-temperature bulk Li+ ion conductivity of 1.63 × 10-4 S cm-1 was achieved for Li1.25Cr0.25Ti1.5O4.
  • Addition of 1 wt.% Li3BO3 (LBO) to Li1.25Cr0.25Ti1.5O4 enhanced conductivity, reaching an average bulk Li+ ion conductivity of 6.8 × 10-4 S cm-1.
  • An electrochemically active solid solution of Li1.25Cr0.25Mn1.5O4 and LiNi0.5Mn1.5O4 was successfully prepared.

Conclusions:

  • Li-stuffed spinels demonstrate the potential for fast Li+ ion conduction.
  • The concept of Li-stuffed spinels can be utilized to create single-phase fully solid electrodes.
  • This approach offers a pathway to overcome interphase impedance issues in solid-state batteries.