Enhancing lithium-ion-battery performance: Metal-organic-frameworks integrated separators to Improve the cycle life

Abstract

Lithium-ion batteries (LIBs) power most modern devices and electric vehicles but face problems like capacity loss, safety risks, and gas generation that reduce their lifespan. These gases (CO2, H2, and O2) form due to electrolyte breakdown and unstable Ni-rich cathodes, causing swelling and degradation. To solve this, researchers are using metal-organic frameworks (MOFs), highly porous materials that can trap gases. This study developed MOF-integrated separators to improve LIB performance. Zirconium-based (Zr-MOF-808) and nickel-based (Ni-MOF-74) MOFs were synthesized and added to various separators (PVDF-HFP films, glass fiber, and Celgard 3501) to boost ion transport and absorb gases. When tested in half-cell batteries with NMC622 cathodes, these MOF-separators improved stability and cycle life by capturing harmful gases. Supported by the EU-funded PHOENIX project, this work advances safer, longer-lasting, and more sustainable lithium-ion batteries.