Overview
- Researchers at Switzerland's Paul Scherrer Institute combined moderate-temperature densification of argyrodite Li6PS5Cl with a nanoscale lithium fluoride passivation on the lithium metal anode.
- The electrolyte was gently sintered at roughly 80°C under pressure, yielding a dense microstructure that resists dendrite intrusion.
- A 65 nm LiF layer applied by vacuum evaporation stabilized the anode–electrolyte interface and blocked dendrite growth during high-rate operation.
- Button-cell tests retained about 75% of initial capacity after 1,500 full cycles at high voltage, placing the results among the stronger durability reports for solid-state systems.
- The team reports that the low-temperature route cuts energy use and cost compared with >400°C sintering or extreme pressure, with further adjustments required before industrial scale-up.