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Cryoporometry for short T 2 samples: A T 1 filter method applied to battery electrode characterization.

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Magnetic Resonance Letters
|January 30, 2026
PubMed
Summary

This study introduces a novel cryoporometry method using T1 contrast for porous materials like lithium-iron phosphate (LFP) and nickel-manganese-cobalt oxides (NMC). This technique accurately measures pore size distribution in paramagnetic battery cathode materials.

Keywords:
Battery electrodeCryoporometryLiquid–solid separationLow field NMRPore size distributionShort T2 relaxation times

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Physical Chemistry

Background:

  • Pore size distribution is crucial for transport in porous media.
  • Traditional cryoporometry using T2 relaxation is unsuitable for paramagnetic materials like LFP and NMC due to short relaxation times.
  • Gas adsorption and mercury injection have limitations for macropore characterization in certain materials.

Purpose of the Study:

  • To develop and validate a cryoporometry method for determining pore size distribution in paramagnetic porous materials.
  • To overcome the limitations of T2 relaxation-based cryoporometry for materials like lithium-iron phosphate (LFP) and nickel-manganese-cobalt oxides (NMC).
  • To utilize T1 contrast for phase separation in NMR cryoporometry experiments.

Main Methods:

  • Implementation of a Peltier-based system for precise temperature control (±0.05 °C) within an NMR probe.
  • Application of slow temperature ramps (down to 0.002 °C/min) for accurate pore size analysis.
  • Utilizing T1 relaxation contrast to differentiate between liquid and frozen octamethylcyclotetrasiloxane (OMCTS) phases in paramagnetic samples.

Main Results:

  • Demonstrated successful application of T1 contrast for phase separation in cryoporometry of paramagnetic materials.
  • Characterized pore size distribution in LFP and NMC cathode materials, relevant to battery technology.
  • Investigated temperature-dependent T1 variations of bulk frozen OMCTS.

Conclusions:

  • The proposed T1-based NMR cryoporometry is a viable alternative for pore size analysis in paramagnetic porous materials.
  • This method provides essential pore size data for materials where conventional techniques fail.
  • The findings are directly applicable to the characterization of industrial battery cathode materials.