Composite solid electrolyte using zeolite and fluorinated lithium salt

Dendrite-suppressing composite solid electrolyte with enhanced elongation using zeolite and high-content fluorinated lithium salt

This technology optimizes the dispersion of fluorinated lithium salt and precisely controls its content by utilizing the mesoporous structure of zeolite, thereby increasing the ionic conductivity of the composite solid electrolyte and suppressing lithium dendrite growth.

Conventional solid polymer electrolytes suffer from low ionic conductivity at room temperature. Furthermore, when used with lithium metal anodes, the growth of lithium dendrites leads to internal short circuits and reduced safety.

This technology creates a composite solid electrolyte by blending polyalkylene oxide-based polymers and zeolite particles with 30–40 wt% of fluorinated lithium salt (such as LiTFSI), raising the work function to 3.5 eV or higher and achieving an elongation rate at least 1.5 times greater than that of a 10 wt% composition. It can be applied to lithium metal anode-based all-solid-state batteries, flexible wearable batteries, and free-standing film-type electrolyte membranes, improving adhesion to electrodes to lower interfacial contact resistance and reduce the risk of short circuits.

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Key Features:

• Composite solid electrolyte comprising zeolite, ion-conductive polymer, and fluorinated lithium salt
• Fluorinated lithium salt contained at 30 to 40 wt%, increasing elongation by at least 1.5 times compared to a 10 wt% composition
• Zeolite particles with an average particle diameter of 200 to 1,000 nm and an average pore diameter of 1 to 10 nm
• Free-standing film-type composite solid electrolyte with a work function of 3.5 eV or higher, positioned between the cathode and anode

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