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Toward zero-excess lithium sulfur batteries: a systematic cell parameter study

Cruddos, Joshua H; Robinson, James B; Shearing, Paul R; Rettie, Alexander JE; (2025) Toward zero-excess lithium sulfur batteries: a systematic cell parameter study. Journal of Physics: Energy , 7 (2) , Article 025006. 10.1088/2515-7655/ada700. Green open access

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Abstract

Zero-excess lithium (ZEL) or 'anode-free' batteries aim to minimize negative electrode material and address the challenges associated with handling thin lithium metal foils during fabrication. To date, most studies in the field of ZEL cells have primarily focused on lithium-ion chemistry, with considerably fewer systematic investigations into ZEL-sulfur (ZELiS) cell fabrication and optimization. Here we develop a ZELiS battery, comprising a Li2S-based composite positive electrode on carbon paper paired with a Ni foil current collector (CC) and evaluate the effects of various CC materials, electrolyte volume to Li2S mass ratio and C-rate. The developed cells reproducibly achieve an average Coulombic efficiency of 99% from cycles 2 to 200, and a final capacity of 272 mAh g−1Li2S at a C/10 rate. Furthermore, we employ x-ray computed tomography to elucidate the morphological changes and degradation processes occurring within the positive electrode composite, revealing the irreversible loss of Li2S/S8 during cycling, which is exacerbated at high rates. These results should be useful in the development of commercially viable ZEL energy storage devices.

Type: Article
Title: Toward zero-excess lithium sulfur batteries: a systematic cell parameter study
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/2515-7655/ada700
Publisher version: https://doi.org/10.1088/2515-7655/ada700
Language: English
Additional information: Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 license,https://creativecommons.org/licenses/by/4.0/ . Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Keywords: Zero excess Li, anode free, Li sulfur, Li sulfide
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10203830
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