Poly(ethylene oxide) ( PEO) is a water-soluble polymer. Although PEO does not have a good ionic conductivity (around 10^-4 - 10^-8), it is widely used in conjunction with carbon black or conductive ceramic powder to form a conductive composite, and also can be used to make solid electrolyte for Li-Metal battery.

• Appearance:                      White to off white
• Melting Point:                    66 - 70 oC
• Density:                            1.11 - 1.2 kg/Liter  
• Flash Point:                       423 - 425 oC  
• Gravimetric analysis:         0.3 -0.8  wt% ( SiO2 )
• Brittle Point:                      - 50oC
• Viscosity: (mpa.s )             497 - 536 ( 5% aq at 25oC    
• Packing:                           250g per bag sealed in vacuum (moisture content<2%RH)  
• Average Molecular Weight (Mv): 700000                              

 Material Safety Data Sheet

Reference article: 

• How to prepare PEO LiTFSI solid polymer electrolyte
• Super Soft All-Ethylene Oxide Polymer Electrolyte for Safe All-Solid Lithium Batteries
• Distinct charge dynamics in battery electrodes revealed by in situ and operando soft X-ray spectroscopy