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 language | English |
---|---|
Pages (from-to) | 610-618 |
Number of pages | 9 |
Journal | Energy and Environmental Science |
Volume | 16 |
Issue number | 2 |
DOIs | |
State | Published - Jan 6 2023 |
Externally published | Yes |
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.