Crosslinker for quasi-solid electrolytes, quasi-solid electrolyte containing the same, and secondary battery using the same

Non-flammable quasi-solid electrolyte with suppressed anion mobility using a boron-centered polyester crosslinker

This technology features a polyester-based crosslinker with a central boron (B) atom and terminal (meth)acryloyl groups. The boron atom coordinates with anions to suppress their mobility, while the polyester structure creates transport channels for alkali metal cations, simultaneously enhancing ionic conductivity and mobility.

Glycol-based crosslinkers used in conventional gel polymer electrolytes suffer from low electrochemical stability and flammability. Liquid electrolytes face leakage issues, while ionic liquids are limited by low ionic conductivity and high viscosity.

This technology involves mixing a crosslinker—synthesized by reacting a polyol compound with a (meth)acryloyl compound and modifying it with a boron compound—with a porous support and liquid electrolyte to form a quasi-solid state. This ensures non-flammability while leveraging the synergy between the boron and polyester structure to boost cation mobility and electrochemical stability. Applicable to quasi-solid electrolytes for lithium and sodium secondary batteries and leak-proof cells for wearable devices, it reduces fire risks while maintaining ion transport properties comparable to liquid electrolytes.

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Key Features:

• Crosslinker for quasi-solid electrolytes where R1 to R6 are C1 to C8 alkyl groups and terminal Z1 to Z6 are acryloyl or methacryloyl groups
• Crosslinker for quasi-solid electrolytes that coordinates with anions of alkali metal salts, using lithium or sodium salts as the alkali metal salt
• First step of mixing a dihydroxy polyol compound with an amine compound and mixing a (meth)acryloyl compound with a separate solvent
• Third step of adding a boron compound to the intermediate in an inert gas atmosphere, stirring at a two-stage temperature, and drying in a vacuum oven

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This invention was developed with support from the Ministry of Trade, Industry and Energy for the development of high-spec supercapacitors and high-power modules.

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