This technology features an electrode structure that maximizes active material content by using a solvent-free polymer solid electrolyte composition. By mixing 120 to 350 parts by weight of excess lithium salt per 100 parts by weight of liquid monomer, we enhance ionic conductivity and oxidative stability, while allowing the composition to function as an electrode binder.
Conventional solid electrolytes suffer from low ionic conductivity and high interfacial resistance. Furthermore, the use of separate binders reduces energy density, and the use of solvents during manufacturing creates pores after drying, leading to lower process efficiency.
This technology involves mixing liquid monomers containing functional groups such as carbonyl, amine, epoxy, phenol, urethane, or acrylate with excess lithium salts like LiTFSI or LiFSI to create a solvent-free slurry with electrode active materials, which is then thermally cross-linked to form the electrode. By maintaining the electrolyte composition content within the electrode at 9–23 wt%, sufficient adhesion and an ionic network are secured without the need for a separate binder. Applicable to polymer-based all-solid-state batteries using high-voltage cathodes like NCM811 or LNMO, as well as cells for communication equipment and ESS, this method simplifies production lines by eliminating drying and solvent recovery steps.
This invention was developed with support from the Ministry of Science and ICT for a single-ion conductor-based multidimensional free-form power system.
US2025-0163197A1
