Issue 2, 2023

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

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
12 Okt 2022
Accepted
06 Jan 2023
First published
06 Jan 2023

Energy Environ. Sci., 2023,16, 610-618

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

C. Y. Kwok, S. Xu, I. Kochetkov, L. Zhou and L. F. Nazar, Energy Environ. Sci., 2023, 16, 610 DOI: 10.1039/D2EE03297J

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