Visualization of Dissolution‐Precipitation Processes in Lithium–Sulfur Batteries

Sadd, Matthew, 1994 (author): Chalmers tekniska högskola,Chalmers University of Technology

De Angelis, Salvatore (author): Danmarks Tekniske Universitet,Technical University of Denmark

Colding-Jørgensen, Sofie (author): Danmarks Tekniske Universitet,Technical University of Denmark

Blanchard, Didier (author): Danmarks Tekniske Universitet,Technical University of Denmark

Johnsen, Rune E. (author): Danmarks Tekniske Universitet,Technical University of Denmark

Sanna, Simone (author): Universita degli Studi di Roma Tor Vergata,University of Rome Tor Vergata

Matic, Aleksandar, 1968 (author): Chalmers tekniska högskola,Chalmers University of Technology

Bowen, Jacob R. (author): Danmarks Tekniske Universitet,Technical University of Denmark

(creator_code:org_t)

2022-01-22
2022
English.
In: Advanced Energy Materials. - : Wiley. - 1614-6840 .- 1614-6832. ; 12:10

Related links:: https://research.cha... (primary) (free); show more...; https://onlinelibrar...; https://research.cha...; https://doi.org/10.1...; show less...

Abstract Subject headings

In this work, light is shed on the dissolution and precipitation processes S8 and Li2S, and their role in the utilization of active material in Li-S batteries. Combining operando X-ray Tomographic Microscopy and optical image analysis, in real-time; sulfur conversion/dissolution in the cathode, the diffusion of polysulfides in the bulk electrolyte, and the redeposition of the product of the electrochemical reaction, Li2S, on the cathode are followed. Using a custom-designed capillary cell, positioning the entire cathode volume within the field of view, the conversion of elemental sulfur to soluble polysulfides during discharge is quantitatively followed. The results show the full utilization of elemental sulfur in the cathode in the initial stage of discharge, with all solid sulfur converted to soluble polysulfide species. Optical image analysis shows a rapid diffusion of polysulfides as they migrate from the cathode to the bulk electrolyte at the start of discharge and back to the cathode in the later stages of discharge, with the formation and precipitation of Li2S. The results point to the redeposition of Li2S on all available surfaces in the cathode forming a continuous insulating layer, leaving polysulfide species remaining in the electrolyte, and this is the process limiting the cell's specific capacity.

TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Energiteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Energy Engineering (hsv//eng)
NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
TEKNIK OCH TEKNOLOGIER -- Naturresursteknik -- Energisystem (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Environmental Engineering -- Energy Systems (hsv//eng)

By the author/editor: Sadd, Matthew, 1 ...; De Angelis, Salv ...; Colding-Jørgense ...; Blanchard, Didie ...; Johnsen, Rune E.; Sanna, Simone; show more...; Borisova, Elena; Matic, Aleksanda ...; Bowen, Jacob R.; show less...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Mechanical Engin ...; and Energy Engineeri ...

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Atom and Molecul ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Environmental En ...; and Energy Systems

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