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Advancing sulfide solid electrolytes via green Li2S synthesis
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Advancing sulfide solid electrolytes via green Li2S synthesis
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Journal Article
Advancing sulfide solid electrolytes via green Li2S synthesis
2025
Overview
We present a potentially eco-friendly, cost-efficient strategy for synthesizing high-purity Li
2
S, a key precursor for sulfide-based solid electrolytes. While these electrolytes surpass conventional organic counterparts in both safety and performance, their widespread application is hindered by the high cost of Li
2
S. Here, a solvent-free metathesis route is developed, in which thiourea serves as an S
2
⁻ donor to sulfurize LiOH, enabling scalable Li
2
S production (∼100 g per batch) with significantly reduced projected costs. During the process, intermediates (H
2
NCN, H
2
O) are transformed into benign gases (CO
2
, NH
3
) that spontaneously leave the system, thereby driving Li
2
S formation without Δ
G
mix
limitations. The as-synthesized Li
2
S is successfully applied to prepare sulfide-based solid electrolytes such as Li
10
GeP
2
S
12
and argyrodite-Li
5.5
PS
4.5
Cl
1.5
, achieving laboratory-scale (1 kg) production costs reduction of up to 27.5% and 92.9%, respectively. Furthermore, all-solid-state batteries employing Li
5.5
PS
4.5
Cl
1.5
demonstrate electrochemical performance comparable to those fabricate with commercial Li
2
S. This scalable methodology thus may provide a proming pathway to bridge low-cost Li
2
S synthesis with the practical deployment of sulfide-based solid electrolytes, which may accelerate the commercialization of high-performance all-solid-state batteries.
Sulfide solid electrolytes show potential for safer, higher-performance batteries, but costly Li
2
S precursors hinder commercial adoption. Here, authors develop a scalable, potentially eco-friendly Li
2
S synthesis method that reduces its production costs, which could facilitate wider deployment of sulfide solid electrolytes.
