The impact of magnesium content on lithium-magnesium alloy electrode performance with argyrodite solid electrolyte

Jack Aspinall, Krishnakanth Sada, Hua Guo, Souhardh Kotakadi, Sudarshan Narayanan, Yvonne Chart, Ben Jagger, Emily Milan, Laurence Brassart, David Armstrong and Mauro Pasta ()
Additional contact information
Jack Aspinall: University of Oxford
Krishnakanth Sada: University of Oxford
Hua Guo: University of Oxford
Souhardh Kotakadi: University of Oxford
Sudarshan Narayanan: University of Oxford
Yvonne Chart: University of Oxford
Ben Jagger: University of Oxford
Emily Milan: University of Oxford
Laurence Brassart: University of Oxford
David Armstrong: University of Oxford
Mauro Pasta: University of Oxford

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract Solid-state lithium-based batteries offer higher energy density than their Li-ion counterparts. Yet they are limited in terms of negative electrode discharge performance and require high stack pressure during operation. To circumvent these issues, we propose the use of lithium-rich magnesium alloys as suitable negative electrodes in combination with Li6PS5Cl solid-state electrolyte. We synthesise and characterise lithium-rich magnesium alloys, quantifying the changes in mechanical properties, transport, and surface chemistry that impact electrochemical performance. Increases in hardness, stiffness, adhesion, and resistance to creep are quantified by nanoindentation as a function of magnesium content. A decrease in diffusivity is quantified with 6Li pulsed field gradient nuclear magnetic resonance, and only a small increase in interfacial impedance due to the presence of magnesium is identified by electrochemical impedance spectroscopy which is correlated with x-ray photoelectron spectroscopy. The addition of magnesium aids contact retention on discharge, but this must be balanced against a decrease in lithium diffusivity. We demonstrate via electrochemical testing of symmetric cells at 2.5 MPa and 30∘C that 1% magnesium content in the alloy increases the stripping capacity compared to both pure lithium and higher magnesium content alloys by balancing these effects.

Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/s41467-024-48071-0 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-48071-0

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-024-48071-0

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().