This technology involves applying a coating solution containing dissolved metal compounds and polymers onto a lithium metal surface. This creates a dual-layer protective film consisting of a second layer of lithium alloy and inorganic materials formed by reaction with lithium, topped by a third layer of polymer.
Lithium metal anodes are prone to dendrite growth during charge and discharge cycles, which can lead to short circuits and fire hazards. Furthermore, side reactions with the electrolyte cause electrolyte depletion and lithium consumption, resulting in a shortened battery lifespan.
This technology uses dimethyl sulfoxide (DMSO) as a primary solvent and fluoroethylene carbonate (FEC) or sulfolane as a secondary solvent to dissolve metal compounds and polymers for coating onto the lithium surface. During the coating process, the metal compounds react with the lithium to form a Li-M alloy and a lithium halide layer, while the upper polymer layer physically blocks electrolyte penetration to stabilize the interface. Applicable to lithium metal secondary batteries, next-generation high-energy EV cells, and all-solid-state batteries using lithium anodes, this method enables mass production of anode protective layers through a solution process without the need for vacuum deposition.
This invention was developed with support from the Ministry of Science and ICT for the development of core technologies for high-energy-density lithium metal batteries based on the design of natural organic/inorganic composite membrane formation reactions.
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