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Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy
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Microenvironments between cathode active materials and solid electrolytes for all-solid-state batteries.

Ju-Hyeon Lee1, Eun Seo Kang1, Ji Young Kim2

  • 1School of Materials Science and Engineering, KNU Advanced Material Research Institute, Kyungpook National University, Daegu, 41566, Republic of Korea. jihoonlee@knu.ac.kr.

Materials Horizons
|December 23, 2025
PubMed
Summary
This summary is machine-generated.

Uniform interfaces in composite cathodes are crucial for all-solid-state batteries (ASSBs). Optimizing the mixing sequence of cathode active material (CAM) and solid electrolyte (SE) enhances lithium-ion transport and battery stability.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • All-solid-state batteries (ASSBs) offer superior safety and energy density but face challenges with composite cathode (CC) interfacial properties.
  • Understanding the microenvironment within CC layers is critical for improving ASSB performance.

Purpose of the Study:

  • To systematically investigate how the mixing sequence of cathode active material (CAM), solid electrolyte (SE), and conductive carbon affects ASSB performance.
  • To elucidate the mechanistic origins of performance disparities in ASSBs based on CC microstructure.

Main Methods:

  • Preparation of three distinct CC configurations with varying mixing sequences.
  • Multiscale synchrotron-based characterizations to analyze interfacial properties and material states.
  • Electrochemical testing of ASSB cells under various conditions, including elevated temperatures and different cell designs.

Main Results:

  • Uniform CAM|SE interfaces promote efficient lithium-ion transport, leading to enhanced rate capability and cycling stability.
  • Non-uniform interfaces increase charge-transfer resistance, causing premature cell failure due to localized overcharging and SE decomposition.
  • The benefits of uniform interfaces are more pronounced at 30 °C, improving performance under limited ionic transport.

Conclusions:

  • A direct correlation exists between CAM|SE interfacial uniformity, solid electrolyte stability, and overall ASSB performance.
  • Controlling CC microstructure is essential for developing reproducible, high-performance ASSBs.
  • This research provides practical guidelines for optimizing CC layers for real-world ASSB applications.