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Ionic Peltier effect in Li-ion electrolytes.

Zhe Cheng1, Yu-Ju Huang1, Beniamin Zahiri1

  • 1Department of Materials Science and Engineering and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. d-cahill@illinois.edu.

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Researchers developed a sensitive bridge to measure tiny temperature differences in lithium-ion cells. This reveals insights into heat and charge transport, crucial for understanding electrochemical materials and battery performance.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Electrochemistry

Background:

  • Coupled charge and heat transport offer fundamental insights into material thermodynamics and kinetics.
  • Understanding these transport phenomena is crucial for developing advanced electrochemical devices.

Purpose of the Study:

  • To develop a sensitive measurement technique for ionic Peltier coefficients in lithium-ion electrochemical cells.
  • To investigate the influence of various factors (salt concentration, solvent, electrode material, temperature) on ionic transport.

Main Methods:

  • Utilized a sensitive ac differential resistance bridge for precise temperature difference measurements (better than 10 μK).
  • Measured ionic Peltier coefficients in symmetric Li-ion cells under varying experimental conditions.

Main Results:

  • Determined negative and large ionic Peltier coefficients (|-Π| > 30 kJ mol⁻¹).
  • Observed that heat flows opposite to Li-ion drift, with coefficients increasing at temperatures above 300 K.
  • Peltier coefficient remained constant over diffusion timescales, indicating minor role of heat of transport compared to entropy changes.

Conclusions:

  • Demonstrated a novel platform for studying non-equilibrium thermodynamics in electrochemical cells.
  • Provided insights into electrochemical material transport properties via temperature and heat current measurements.
  • Complemented traditional voltage and charge current measurements with thermal transport data.