Poly gel polymer electrolytes

While the electrolyte layer used commercially is usually electrolyte solvent/Li salt with a porous separator (e.g., Celgard ), polymer addition to the electrolyte layer is becoming more prevalent due to safety considerations. With polymer addition, two types of systems are generally considered, namely, solid polymer electrolyte and a gel polymer electrolyte. Poly(ethylene oxide) is the preferred material for the solid polymer electrolyte which is comprised of polymer and Li salt with limited to no organic electrolyte solvent. The gel polymer electrolyte is comprised of polymer, Li salt and a large amount of organic electrolyte solvent. Poly(vinylidene fluoride) and copolymers, PMMA, and PAN are often noted as key candidates for gel polymer electrolyte layers. Not surprising, polymer blends have been proposed for both... 

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