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Related Experiment Video

Updated: Jun 12, 2026

A Simple Approach to Perform TEER Measurements Using a Self-Made Volt-Amperemeter with Programmable Output Frequency
07:43

A Simple Approach to Perform TEER Measurements Using a Self-Made Volt-Amperemeter with Programmable Output Frequency

Published on: October 5, 2019

Nanometre-precision terahertz interferometry for battery electrode metrology.

Guseon Kang1,2, Jaeyoon Kim1, Mee-Ree Kim3

  • 1Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea.

Nature Communications
|June 10, 2026
PubMed
Summary

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This study introduces a novel terahertz (THz) Fabry-Pérot interferometry method for precise, non-destructive thickness measurements in lithium-ion battery (LIB) manufacturing, significantly improving accuracy and speed.

Area of Science:

  • Materials Science
  • Metrology
  • Optics and Photonics

Background:

  • Accurate, non-destructive thickness measurement is critical for lithium-ion battery (LIB) production.
  • Current methods (X-ray, acoustic, optical) face limitations in speed, resolution, or material penetration.

Purpose of the Study:

  • To develop a high-precision, non-destructive thickness measurement technique for LIB electrodes.
  • To overcome the limitations of existing metrology approaches in LIB manufacturing.

Main Methods:

  • Utilized terahertz (THz) Fabry-Pérot (FP) interferometry referenced to a photonic frequency comb.
  • Leveraged THz radiation's properties and the comb's SI-traceable accuracy for measurements.
  • Employed spectral analysis for simultaneous determination of complex refractive index.

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Related Experiment Videos

Last Updated: Jun 12, 2026

A Simple Approach to Perform TEER Measurements Using a Self-Made Volt-Amperemeter with Programmable Output Frequency
07:43

A Simple Approach to Perform TEER Measurements Using a Self-Made Volt-Amperemeter with Programmable Output Frequency

Published on: October 5, 2019

Focused Ion Beam Fabrication of LiPON-based Solid-state Lithium-ion Nanobatteries for In Situ Testing
10:58

Focused Ion Beam Fabrication of LiPON-based Solid-state Lithium-ion Nanobatteries for In Situ Testing

Published on: March 7, 2018

Picometer-Precision Atomic Position Tracking through Electron Microscopy
15:04

Picometer-Precision Atomic Position Tracking through Electron Microscopy

Published on: July 3, 2021

Main Results:

  • Achieved nanometre-precision thickness measurements of LIB electrodes (50-150 μm).
  • Demonstrated measurement precision of 7.8 nm (anode) and 25.2 nm (cathode) with rapid data acquisition.
  • Showcased a one-to-two order of magnitude improvement over existing temporal-analysis methods.

Conclusions:

  • The THz FP interferometry system offers a unified, calibration-free platform for advanced LIB metrology.
  • The technique enables 3D profiling and dynamic thickness monitoring for next-generation battery manufacturing.
  • This advancement significantly enhances quality control and process optimization in LIB production.