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Updated: Oct 1, 2025

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Ionic liquid-containing cathodes empowering ceramic solid electrolytes.

Eric Jianfeng Cheng1,2, Mao Shoji2, Takeshi Abe1

  • 1Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan.

Iscience
|March 4, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a quasi-solid-state cathode using ionic liquid (IL) to reduce interfacial resistance in solid-state lithium-metal batteries with ceramic electrolytes like lithium lanthanum zirconium oxide (LLZO). This approach improves battery performance and offers a practical way to utilize LLZO electrolytes.

Keywords:
CeramicsEnergy storageMaterials science

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Battery Technology

Background:

  • Ceramic solid electrolytes, such as lithium lanthanum zirconium oxide (LLZO), are promising for safe, high-energy-density solid-state lithium-metal batteries.
  • A major challenge is the high interfacial resistance between ceramic solid electrolytes and conventional cathodes, hindering practical application.

Purpose of the Study:

  • To develop a quasi-solid-state composite cathode that minimizes interfacial resistance with ceramic solid electrolytes.
  • To enable the practical application of aluminum-doped LLZO (Al-LLZO) ceramic electrolytes in solid-state batteries.

Main Methods:

  • Development of an ionic liquid (IL)-containing, nonfluidic quasi-solid-state lithium cobalt oxide (LCO) composite cathode.
  • Integration of the composite cathode with an Al-LLZO ceramic electrolyte.
  • Electrochemical testing of the quasi-solid-state LCO/Al-LLZO/Li cells at 60°C.

Main Results:

  • Significant reduction in interfacial resistance between the LCO cathode and Al-LLZO electrolyte.
  • Achieved approximately 80% capacity retention after 100 cycles at 60°C.
  • Identified ionic liquid instability as the primary cause of capacity decay.

Conclusions:

  • The IL-containing LCO composite cathode provides a practical method for using Al-LLZO solid electrolytes in solid-state batteries.
  • Optimizing ionic liquid stability is crucial for advancing quasi-solid-state lithium-metal batteries with ceramic solid electrolytes.