This technology is a composite solid electrolyte that disperses specific zeolites—such as Y, Beta, and Mordenite—that have not been ion-exchanged with lithium into an ion-conductive polymer and lithium salt matrix. This prevents polymer crystallization and optimizes lithium-ion diffusion pathways and concentration through Lewis acid-base interactions.
Conventional solid electrolytes have been limited by room-temperature ionic conductivity levels of approximately 10^-5 S/cm, which restricts battery performance. Furthermore, when used with lithium metal anodes, they face issues such as lithium dendrite growth and electrode interface instability.
This technology involves mixing non-ion-exchanged zeolite nanoparticles containing sodium, hydrogen, or ammonium ions with ion-conductive polymers like PEO and lithium salts like LiTFSI. This configuration expands the amorphous regions of the polymer and increases lithium-ion concentration on the zeolite surface. As a result, it achieves ionic conductivity exceeding 4.5×10^-4 S/cm at room temperature. It can be applied to all-solid-state batteries using lithium metal anodes and thin-film batteries for electric vehicles and wearable devices that require reduced fire risks, supporting the design of polymer-based electrolytes capable of room-temperature operation without heating devices.
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