Thermo-electrochemical instrumentation of cylindrical Li-ion cells

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Abstract

The performance evaluation and optimisation of commercially available lithium-ion cells is typically based upon their full cell potential and surface temperature measurements, despite these parameters not being fully representative of the electrochemical processes taking place in the core of the cell or at each electrode. Several methods were devised to obtain the cell core temperature and electrode-specific potential profiles of cylindrical Li-ion cells. Optical fibres with Bragg Gratings were found to produce reliable core temperature data, while their small mechanical profile allowed for low-impact instrumentation method. A pure metallic lithium reference electrode insertion method was identified, avoiding interference with other elements of the cell while ensuring good contact, enabling in-situ observations of the per-electrode electrochemical responses. Our thermo-electrochemical instrumentation technique has enabled us to collect unprecedented cell data, and has subsequently been used in advanced studies exploring the real-world performance limits of commercial cells.
Original languageEnglish
Pages (from-to)309-316
Number of pages8
JournalJournal of Power Sources
Volume379
Early online date17 Feb 2018
DOIs
Publication statusPublished - 1 Mar 2018

Bibliographical note

C 2018 the authors(s). Published by Elsevier B.V. This is an open access article under the CC-BY- NC-ND licence.

Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.

Keywords

  • Cell instrumentation
  • Li-ion cells
  • Optical fibres
  • Reference electrode
  • Safety limits
  • Thermal management

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