Internal Resistance Analysis of Na/NiCl2 Cells using Electrochemical Impedance Spectroscopy

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

  • Nils Büttner - , Professur für Anorganisch-Nichtmetallische Werkstoffe (gB/FG), Fraunhofer-Institut für Keramische Technologien und Systeme (Autor:in)
  • Karl Skadell - , Fraunhofer-Institut für Keramische Technologien und Systeme (Autor:in)
  • Benjamin Schüßler - , Fraunhofer-Institut für Keramische Technologien und Systeme (Autor:in)
  • Laura Nousch - , Fraunhofer-Institut für Keramische Technologien und Systeme (Autor:in)
  • Maria Richter - , Fraunhofer-Institut für Keramische Technologien und Systeme (Autor:in)
  • Matthias Schulz - , Fraunhofer-Institut für Keramische Technologien und Systeme (Autor:in)
  • Alexander Michaelis - , Professur für Anorganisch-Nichtmetallische Werkstoffe (gB/FG), Fraunhofer-Institut für Keramische Technologien und Systeme (Autor:in)

Abstract

A pulsed discharge regime (GITT) was used to investigate the ohmic internal resistance of Na/NiCl2 cells, also known as ZEBRA Cells. Two ways were chosen to determine the internal resistance, on the one side the voltage response of the corresponding current enables a calculation. On the other side the potentiostatic electrochemical impedance spectroscopy (EIS) was used to measure cell spectra including the ohmic internal resistance. By comparing both methods the feasibility of ohmic internal resistance (IR) calculation can be evaluated. The cells were investigated within five different operating temperatures (300 °C-180 °C with 30 K steps). Results show that the ohmic internal resistance of a Na/NiCl2 is increasing when the operating temperature is decreasing, mainly due to the decrease of ionic conductivity of β ″ separator and the secondary electrolyte NaAlCl4. As a direct consequence, there is a significant capacity loss. Therefore, the operating temperature can be identified as capacity limiting factor.

Details

OriginalspracheEnglisch
Aufsatznummer090506
FachzeitschriftJournal of the Electrochemical Society
Jahrgang169
Ausgabenummer9
PublikationsstatusVeröffentlicht - Sept. 2022
Peer-Review-StatusJa