PEO (Polyethylene Oxide) Polymer Solid-State Electrolyte Powder is the most widely‑adopted matrix for polymer‑based solid‑state electrolytes. Ether‑oxygen groups along polymer chains dissociate lithium salts and enable Li⁺ conduction via segmental motion. This high‑viscosity‑average‑molecular‑weight white powder contains no lithium salt. It can be dissolved in organic solvents for solution‑casting free‑standing electrolyte films, or blended with garnet, sulfide or halide fillers to fabricate organic‑inorganic composite solid electrolytes. PEO shows favorable interfacial compatibility with Li‑metal anode, yet suffers from low room‑temperature conductivity due to high crystallinity; optimal performance is achieved at 60‑80 °C. Widely used for mechanism and process research of polymer‑type all‑solid‑state lithium batteries.
| Parameter | Detail |
|---|---|
| Product form | Powder |
| Softening point | 65-67°C |
| Bulk density | 0.2-0.5(kg/L) |
| True density | 1.15-1.22(kg/L) |
| pH | 7‑10 (0.5 wt% aqueous solution) |
| Ash content | ≤2.5% |
| Decomposition temperature | 423-425°C |
| Viscosity-average molecular weight | 100,000 – 7,500,000 |
| Ionic conductivity | 1.41×10-6 S/cm |
| CAS number | 25322‑68‑3 |
- Semi‑crystalline poly(ethylene oxide) powder; viscosity‑average molecular weight 100 000‑7 500 000 available
- Ether‑oxygen groups dissociate lithium salts; Li⁺ conduction realized by polymer segmental motion
- Good interfacial compatibility with Li‑metal anode and mitigates lithium‑dendrite growth
- Excellent film‑forming ability for flexible free‑standing electrolyte membranes
- High crystallinity limits room‑temperature conductivity; much higher conductivity at 60‑80 °C
- Electrochemical stability up to 3.8‑4.0 V (vs Li/Li⁺), compatible with LFP and low‑Ni NCM cathodes
- Suitable for composite electrolyte design by blending with ceramic or sulfide fillers
- Hygroscopic powder; store hermetically under dry condition; glove‑box handling is recommended for formulation
Research of polymer‑based all‑solid‑state lithium batteries and Li‑metal batteries; Fabrication of organic‑inorganic composite solid‑state electrolytes; Development of composite catholyte for solid‑state cells; Fundamental research on interface and ion‑transport mechanism for solid‑state batteries
The material ships vacuum‑sealed under dry atmosphere in moisture‑barrier aluminum‑laminated bags. Therefore, customers should store sealed in dry cabinet or Ar or N₂ glovebox, protected from moisture. Because PEO is hygroscopic, handle exclusively in a dry environment with dew point < –40 °C. Reseal promptly after opening. Keep away from heat sources and oxidizing agents.
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PEO polymer solid-state electrolyte powder requires strict moisture control during storage and handling to prevent hygroscopic degradation. Optimal ionic conductivity is achieved only at elevated temperatures (60–80 °C) due to high crystallinity at room temperature.
- Moisture Sensitivity: Store and handle PEO powder exclusively in a dry environment with dew point below –40 °C, using vacuum-sealed moisture-barrier packaging and resealing promptly after opening.
- Temperature Constraints: The powder softens at 65–67 °C and decomposes above 423 °C; processing must remain within this range to avoid material degradation.
- Electrochemical Stability: PEO exhibits electrochemical stability up to 3.8–4.0 V vs. Li/Li⁺, limiting compatibility to cathodes such as LFP and low-Ni NCM.
- Infrastructure Requirement: Formulation and handling should be performed in an argon or nitrogen glovebox to maintain anhydrous conditions.
At what operating temperature does PEO polymer solid-state electrolyte achieve optimal ionic conductivity?
PEO-based electrolytes perform best at 60–80 °C because high crystallinity limits room-temperature conductivity. The product description lists an ionic conductivity of 1.41×10⁻⁶ S/cm and a softening point of 65–67 °C, consistent with use in this elevated-temperature window for polymer all-solid-state lithium batteries.
Which cathode materials can be paired with this PEO solid-state electrolyte without exceeding its electrochemical stability window?
This PEO electrolyte has electrochemical stability up to 3.8–4.0 V vs Li/Li⁺, so it is compatible with LFP and low-Ni NCM cathodes. Higher-voltage cathode systems would exceed the stated stability window and are not supported by the product information.
What storage and handling conditions are required for PEO solid-state electrolyte powder?
PEO powder is hygroscopic and should be handled in a dry environment with dew point below –40 °C. It ships vacuum-sealed in moisture-barrier aluminum-laminated bags; store it sealed in a dry cabinet or Ar/N₂ glovebox, protected from moisture, and keep it away from heat sources and oxidizing agents.
PEO Polymer Solid-State Electrolyte Powder (viscosity-average molecular weight 100,000–7,500,000) is a semi-crystalline matrix optimized for polymer-based all-solid-state lithium batteries. Its ether-oxygen groups dissociate lithium salts and enable Li⁺ conduction via segmental motion, with good interfacial compatibility against Li-metal anodes, but room-temperature conductivity is limited to ~1.41×10⁻⁶ S/cm due to high crystallinity, necessitating operation at 60–80 °C for practical performance.
Positive
- Li-metal anode compatibility: Good interfacial compatibility with Li-metal anode mitigates lithium-dendrite growth, enabling stable cycling in polymer-type all-solid-state batteries.
- Excellent film-forming ability: PEO dissolves in organic solvents for solution-casting free-standing flexible electrolyte membranes, simplifying fabrication of thin-film solid electrolytes.
Trade-offs
- Low room-temperature conductivity: High crystallinity limits ambient ionic conductivity (~1.41×10⁻⁶ S/cm); optimal Li⁺ conduction requires elevated temperature (60–80 °C), adding thermal management constraints.
- Hygroscopic powder handling: PEO is hygroscopic; must be stored hermetically under dry atmosphere and handled in a glovebox or dry environment (dew point < –40 °C) to prevent moisture uptake that degrades performance.
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