IONZERA vs Celgard PP/PE
Celgard's polypropylene and polyethylene microporous separators dominate lithium-ion batteries, but how do polyolefin films compare to IONZERA's nanocomposite for alkaline electrolysis?
Celgard Separators: Designed for Batteries, Not Electrolysis
Celgard LLC (a Polypore International subsidiary) manufactures microporous polypropylene (PP) and polyethylene (PE) separators primarily for lithium-ion battery applications. These separators are engineered for organic electrolytes, low-temperature operation, and thin-film battery cell designs.
Some researchers and early-stage AWE developers have explored using Celgard-type polyolefin separators in alkaline electrolysis cells. However, PP and PE are fundamentally hydrophobic polymers - they resist wetting by aqueous KOH electrolyte, which is the opposite of what an AWE separator requires.
Why Hydrophilicity Is Non-Negotiable for AWE
In alkaline water electrolysis, the separator must be thoroughly wetted by the KOH electrolyte to enable hydroxide ion transport. A hydrophobic separator creates a barrier to ion flow, increasing area resistance and reducing electrolyser efficiency. IONZERA addresses this requirement decisively:
Nanocomposite Structure
PSU-TiO₂-GOChemical Stability in Concentrated KOH
AWE separators operate in 25–30 wt% KOH at elevated temperatures - a highly aggressive alkaline environment. IONZERA's polysulfone (PSU) matrix is chemically resistant to concentrated KOH, with proven stability across the operating temperature range.
Celgard's polyolefin separators, while chemically inert to most organic solvents, can suffer from KOH-induced embrittlement and loss of mechanical integrity over extended exposure. They were simply not designed for this operating environment.
Use the Right Tool for the Job
Celgard separators are excellent products for their intended application - lithium-ion batteries with organic electrolytes. For alkaline water electrolysis, however, a purpose-built separator like IONZERA provides the hydrophilicity, alkaline stability, and optimized pore structure that polyolefin films cannot deliver. Using a battery separator in an electrolyser is a compromise that limits performance from day one.
Inherently Hydrophilic
24° contact angle vs >90° for PP/PE - complete KOH electrolyte wetting without surface treatment
KOH-Stable Chemistry
PSU-TiO₂-GO withstands 30 wt% KOH without embrittlement or degradation
Purpose-Built for AWE
Optimized pore size, porosity, and composition specifically for alkaline electrolysis conditions
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