High-performance all-solid-state Li2S batteries using an interfacial redox mediator

Chun Yuen Kwok, Shiqi Xu, Ivan Kochetkov, Laidong Zhou, Linda F. Nazar

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

All-solid-state Li-S batteries based on lithium sulfide cathodes have generated much excitement as possible next-generation energy storage candidates because they can offer a high theoretical energy density exceeding that of lithium-ion batteries, and the possibility of “anode-less” cell designs. However, solid-state Li2S cathode kinetics are hindered by both limited ionic and electronic transport and a high activation barrier on charge. Here we report a Li2S/LiVS2 core-shell cathode architecture design, whereby the shell serves as both a charge-carrier transport vehicle and electron transfer mediator for Li2S during oxidation. With an argyrodite-type solid electrolyte, the solid-state Li2S cell exhibits very good rate capability up to 3 mA cm−2 at room temperature, and nearly 80% capacity retention up to 1000 cycles at a moderate current density of 1 mA cm−2. High active material loading (4 and 6 mg cm−2) is demonstrated in this configuration with stable capacity retention. High areal capacity up to 5.3 mA h cm−2 with a very high active material loading of 10 mg cm−2 is also reported, albeit with limited cycle life.

Original languageEnglish
Pages (from-to)610-618
Number of pages9
JournalEnergy and Environmental Science
Volume16
Issue number2
DOIs
StatePublished - Jan 6 2023
Externally publishedYes

Funding

This research was financially supported by Conamix, Inc. LFN also gratefully acknowledges funding by NSERC through a Canada Research Chair, and the Ontario Research Fund (ORF-RE program). The authors graciously thank Dr Jason Tam and Dr Peter Brodersen at the University of Toronto for carrying out the TEM study.

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