Zwitterionic Organic Framework for All-Solid-State Secondary Batteries, Electrolyte Containing the Same, and All-Solid-State Secondary Battery Including the Same

High-Speed Lithium-Conducting Solid Electrolyte Using Zwitterionic COF Channels

This technology features a solid electrolyte that utilizes a zwitterionic structure within a Covalent Organic Framework (COF). By introducing nitrogen-based cationic rings and alkyl-linked anionic functional groups, it enhances lithium-ion dissociation and provides ion-conducting channels through a stacking structure.

Conventional inorganic solid electrolytes suffer from poor processability and high interfacial resistance. Meanwhile, amorphous organic electrolytes are limited by low ionic conductivity and insufficient thermal and electrochemical stability.

This technology forms pores and channels using a zwitterionic COF that combines cationic nitrogen-containing ring compounds with anionic functional groups. The cationic sites in the framework trap anions from lithium salts like LiTFSI, while the anionic groups attract lithium ions. Applicable to solid electrolyte layers and polymer-COF composite membranes in all-solid-state lithium batteries, it accelerates lithium-ion transport with the aid of anions within the channels.

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Key Features:

• Covalent organic framework for all-solid-state secondary batteries with a zwitterionic structure
• Zwitterionic cyclic compound containing cationic nitrogen as a ring element and bonded to an anionic functional group
• Electrolyte with stacked zwitterionic organic frameworks forming internal lithium-ion transport channels
• Anion-retaining organic precursor positioned within the stacked channels to increase lithium-ion transport speed

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This invention was developed with support from the Ministry of Science and ICT for photosensitive nanocluster artificial antibodies for multimodal cancer immunotherapy.

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