Solid electrolyte composition, method for manufacturing the same, and battery comprising the same

Zeolite-dispersed solid electrolyte surface-modified with polysiloxane-acrylic polymer

This technology maximizes the dispersibility of inorganic additives, such as zeolites, within polymer matrices like PEO and enhances ionic conductivity by modifying the surface of the additives with an acrylic polymer containing polysiloxane side chains.

Conventional composite solid electrolytes suffer from poor interfacial affinity between inorganic additives and polymers, leading to inorganic aggregation and reduced lithium-ion conductivity. This results in increased interfacial resistance and dendrite growth, which compromises battery stability.

This technology uses an acrylic polymer with hydroxyl-functionalized (-OH) polysiloxane side chains to convert the hydrophilic surfaces of inorganic additives, such as CHA-structured SSZ-13 zeolite, into hydrophobic surfaces. This ensures uniform dispersion within the polymer and promotes lithium-ion adsorption and dissociation through nanopores. It is ideal for polymer-based all-solid-state batteries and flexible wearable power sources, facilitating the production of thin, homogeneous electrolyte membranes without the aggregation typically caused by inorganic fillers.

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Key Features:

• Inorganic additives surface-modified with an acrylic polymer containing polysiloxane side chains, formulated with a polymer and a lithium salt
• Acrylic polymer with a portion of its terminal groups functionalized with hydroxyl groups and a polysiloxane side chain weight-average molecular weight ranging from 1,000 to 30,000
• Zeolite inorganic additive with a CHA framework structure, an Si/Al ratio of 5 or higher, and a content of 20 wt% or less based on the total weight of the composition
• Polymer matrix composed of an ion-conductive polyether-based polymer that supports the inorganic additive and lithium salt

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