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- Title
Visualizing Reaction Fronts and Transport Limitations in Solid‐State Li–S Batteries via Operando Neutron Imaging.
- Authors
Bradbury, Robert; Dewald, Georg F.; Kraft, Marvin A.; Arlt, Tobias; Kardjilov, Nikolay; Janek, Jürgen; Manke, Ingo; Zeier, Wolfgang G.; Ohno, Saneyuki
- Abstract
The exploitation of high‐capacity conversion‐type materials such as sulfur in solid‐state secondary batteries is a dream combination for achieving improved battery safety and high energy density in the push toward a sustainable future. However, the exact reason behind the low rate‐capability, bottlenecking further development of solid‐state lithium–sulfur batteries, has not yet been determined. Here, using neutron imaging, the spatial distribution of lithium during cell operation is directly visualized and it is shown that sluggish macroscopic ion transport within the composite cathode is rate‐limiting. Observing a reaction front propagating from the separator side toward the current collector confirms the detrimental influence of a low effective ionic conductivity. Furthermore, irreversibly concentrated lithium in the vicinity of the current collector, revealed via state‐of‐charge‐dependent tomography, highlights a hitherto‐overlooked loss mechanism triggered by sluggish effective ionic transport within a composite cathode. This discovery can be a cornerstone for future research on solid‐state batteries, irrespective of the type of active material.
- Subjects
LITHIUM sulfur batteries; SOLID state batteries; NEUTRONS; LITHIUM cells; STORAGE batteries; IONIC conductivity; ENERGY density
- Publication
Advanced Energy Materials, 2023, Vol 13, Issue 17, p1
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.202203426