LPSCl is a family of argyrodite sulfide solid-state electrolytes built around the Li6PS5Cl framework, delivering some of the highest room-temperature ionic conductivities reported for sulfide electrolytes — up to 10 mS/cm. As a result, LPSCl is the most widely deployed sulfide chemistry in commercial all-solid-state battery (ASSB) development. Atomfair supplies three composition variants (Li6PS5Cl, Li5.5PS4.5Cl1.5, and Li5.5PS4.5(Cl,Br)1.5) across multiple particle size grades, enabling customers to optimize for either bulk conductivity or composite electrode interface design.
| Chemical formula | Particle size | Specification | Ionic conductivity | Theoretical density |
|---|---|---|---|---|
| Li5.5PS4.5Cl1.5 | >5.0 um | 10g | >10 mS/cm,@27°C | 2 g/cm3 |
| 3.0 ± 0.5 um | >7.0 mS/cm,@27°C | |||
| <1.0 um | >5.0 mS/cm,@27°C |
This material serves as a primary electrolyte for all-solid-state lithium batteries, including catholyte for high-loading composite cathodes, anode-side separator paired with halide electrolytes (LZC, LZCO, LNOC, LIC), and bulk separator in pellet and pouch cell architectures. Furthermore, it supports Li-S battery research, ASSB cell prototyping, and pilot-scale solid-state battery manufacturing.
The material ships vacuum-sealed under inert atmosphere in moisture-barrier aluminum-laminated bags. Therefore, customers should store sealed in an Ar or N₂ glovebox, protected from moisture. Because LPSCl sulfide electrolytes are highly moisture-sensitive — they hydrolyze on contact with water to release H₂S — handle exclusively in a controlled dry environment with dew point < –40 °C. Reseal promptly after opening.
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This material is highly moisture-sensitive and hydrolyzes upon contact with water to release toxic hydrogen sulfide gas. Storage must be under inert atmosphere in a glovebox with dew point below -40 °C to prevent degradation.
- Moisture Sensitivity: Hydrolysis on water exposure generates H₂S gas, requiring strict exclusion of atmospheric moisture.
- Inert Atmosphere Storage: Store sealed in an argon or nitrogen glovebox to maintain electrochemical performance.
- Dew Point Control: Maintain glovebox environment with dew point below -40 °C during all handling steps.
- Packaging Integrity: Shipment is vacuum-sealed in moisture-barrier aluminum-laminated bags under inert atmosphere.
- Post-Use Sealing: Reseal the bag promptly after each material withdrawal to prevent moisture ingress.
This procedure describes the safe transfer and use of the moisture-sensitive powder in a controlled dry environment. All steps must be performed inside an inert-gas glovebox with dew point below -40 °C.
Required Equipment: Argon-filled glovebox with continuous moisture monitoring
- Transfer to Glovebox
Transfer the vacuum-sealed bag into the argon-filled glovebox without opening the outer packaging. - Open Under Dry Atmosphere
Open the bag only inside the glovebox, ensuring the atmosphere dew point is below -40 °C. - Reseal After Use
Reseal the bag immediately after each use to prevent moisture ingress and maintain powder integrity.
How does particle size affect ionic conductivity of LPSCl (Li5.5PS4.5Cl1.5) and which grade should I choose for bulk vs composite electrode applications?
Ionic conductivity decreases with smaller particle size: >5.0 µm delivers >10 mS/cm, 3.0 ± 0.5 µm delivers >7.0 mS/cm, and <1.0 µm delivers >5.0 mS/cm, all at 27°C. For bulk separator or separator-layer architectures requiring maximum conductivity, choose the >5.0 µm grade. For composite cathodes or anode-side interfaces where electrode wettability and contact area are critical, the finer 3.0 ± 0.5 µm or <1.0 µm grades provide better solid‑solid contact while still maintaining high conductivity.
Can LPSCl (Li5.5PS4.5Cl1.5) be used as a separator paired with halide electrolytes, and what are the interface considerations?
Yes, the product is specifically designed for use as an anode-side separator paired with halide electrolytes such as LZC, LZCO, LNOC, and LIC. The high ionic conductivity (up to >10 mS/cm) and argyrodite structure enable stable interface formation with these halide materials. No additional coating or interlayer is explicitly required, but the user must ensure dry handling to prevent moisture-induced degradation at the sulfide–halide interface.
What are the critical storage and handling requirements for LPSCl (Li5.5PS4.5Cl1.5) sulfide electrolyte to prevent moisture degradation?
LPSCl is highly moisture-sensitive and hydrolyzes on contact with water to release H₂S. The material ships vacuum-sealed under inert atmosphere in moisture-barrier aluminum-laminated bags. Store sealed in an Ar or N₂ glovebox and handle exclusively in a controlled dry environment with a dew point below –40°C. Reseal the bag promptly after opening to minimize exposure.
The Cl-rich LPSCl variant (Li5.5PS4.5Cl1.5) delivers room-temperature ionic conductivity up to 10 mS/cm for the >5.0 µm grade, with smaller particle sizes offering reduced conductivity but improved interface compatibility for composite cathodes. Strict moisture-free handling is mandatory due to rapid hydrolysis and H₂S release.
Positive
- Highest ionic conductivity among sulfide electrolytes: The >5.0 µm grade achieves >10 mS/cm at 27°C, enabling low-resistance bulk separators in all-solid-state batteries.
- Particle size tunability for application fit: Three size grades (>5.0, 3.0±0.5, <1.0 µm) allow optimization between bulk conductivity and composite electrode interface design.
Trade-offs
- Extreme moisture sensitivity: Hydrolyzes on contact with water to release H₂S; requires handling in dry environment with dew point < –40°C and storage under inert atmosphere.
- Conductivity trade-off with particle size: Smaller particle sizes (<1.0 µm) exhibit lower ionic conductivity (>5.0 mS/cm) versus the >5.0 µm grade (>10 mS/cm), requiring careful selection for target cell architecture.
Every advanced material, component, equipment, and instrument in our catalog is backed by rigorous testing. We maintain strict internal quality management frameworks and align with CE conformity metrics to deliver transparent, reproducible performance data via our public open-science repository.
To request raw batch performance data, submit formal vendor registration paperwork, or execute a fast-turnaround R&D manufacturing loop, contact us at inquiry@atomfair.com.
Item is dispatched under the Atomfair Shipping & Delivery Framework (Free worldwide shipping on orders over $59 USD excl. heavy equipment). Return is governed by the Atomfair Return & Refund Policy (7-day technical return window).
