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Ultrahigh Sulfur Loading Tolerant Cathode Architecture with Extended Cycle Life for High Energy Density Lithium–Sulfur Batteries

Ultrahigh Sulfur Loading Tolerant Cathode Architecture with Extended Cycle Life for High Energy... Lithium–sulfur batteries are regarded as the imminent energy storage device for high energy density applications. However, at practical sulfur loadings >5 mg cm−2, the cell suffers from severe capacity fade and durability. In the present work, a hybrid MoS2–WS2 heterodimensional structure is reported. The strain induced growth of transition metal dichalcogenides preferentially exposes edge sites and maximizes the geometric coverage for anchoring‐diffusion‐conversion of polysulfides to restrain the shuttle effect at practical S‐loadings. The systematic analysis (5–50 mg cm−2 of S‐loadings) reveals that the unique cathode architecture exhibits reversible S‐loading tolerance up to 28 mg cm−2. A high initial areal capacity of 32 mAh cm−2 with an area specific energy density of 67 mWh cm−2 is achieved with a low electrolyte volume/S‐loading ratio of 5 mL g−1. The strategy presented here can unlock high S‐loading Li–S cells with extended cyclability and high energy density. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Energy Materials Wiley

Ultrahigh Sulfur Loading Tolerant Cathode Architecture with Extended Cycle Life for High Energy Density Lithium–Sulfur Batteries

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Publisher
Wiley
Copyright
© 2022 Wiley‐VCH GmbH
ISSN
1614-6832
eISSN
1614-6840
DOI
10.1002/aenm.202201494
Publisher site
See Article on Publisher Site

Abstract

Lithium–sulfur batteries are regarded as the imminent energy storage device for high energy density applications. However, at practical sulfur loadings >5 mg cm−2, the cell suffers from severe capacity fade and durability. In the present work, a hybrid MoS2–WS2 heterodimensional structure is reported. The strain induced growth of transition metal dichalcogenides preferentially exposes edge sites and maximizes the geometric coverage for anchoring‐diffusion‐conversion of polysulfides to restrain the shuttle effect at practical S‐loadings. The systematic analysis (5–50 mg cm−2 of S‐loadings) reveals that the unique cathode architecture exhibits reversible S‐loading tolerance up to 28 mg cm−2. A high initial areal capacity of 32 mAh cm−2 with an area specific energy density of 67 mWh cm−2 is achieved with a low electrolyte volume/S‐loading ratio of 5 mL g−1. The strategy presented here can unlock high S‐loading Li–S cells with extended cyclability and high energy density.

Journal

Advanced Energy Materials – Wiley

Published: Sep 1, 2022

Keywords: expansion tolerant cathodes; high areal capacity; high energy density; lean electrolyte; lithium–sulfur batteries; ultrahigh sulfur loading

References