Integrated manufacturing of REciclable multi-material COmposites for the TRANSport sector
Enabling Scalable Polymer Electrolyte with Dual?Reinforced Stable Interface for 4.5 V Lithium?Metal Batteries
A novel polymer electrolyte (F&NPE) is developed to construct dual?reinforced stable interfaces, which can effectively suppress interfacial parasitic reactions and structural degradation of Ni?rich cathode materials. Meanwhile, a unique two?stage rheology?tuning UV polymerization strategy promising for continuous scalable fabrication is utilized. 4.5 V NCM622//Li batteries achieve excellent long?term cyclability even with high cathode loading and thin Li.Hitherto, it remains a great challenge to stabilize electrolyte–electrode interfaces and impede lithium dendrite proliferation in lithium?metal batteries with high?capacity nickel?rich LiNxCoyMn1?x?yO2 (NCM) layer cathodes. Herein, a special molecular?level?designed polymer electrolyte is prepared by the copolymerization of hexafluorobutyl acrylate and methylene bisacrylamide to construct dual?reinforced stable interfaces. Verified by X?ray photoelectron spectroscopy depth profiling, there are favorable solid electrolyte interphase (SEI) layers on Li metal anodes and robust cathode electrolyte interphase (CEI) on Ni?rich cathodes. The SEI enriched in lithiophilic N?(C)3 guides the homogenous distribution of Li+ and facilitates the transport of Li+ through LiF and Li3N, promoting uniform Li+ plating and stripping. Moreover, the CEI with antioxidative amide groups can suppress the parasitic reactions between cathode and electrolyte and the structural degradation of cathode. Meanwhile, a unique two?stage rheology?tuning UV polymerization strategy is utilized, which is quite suited for continuous electrolyte fabrication with environmental friendliness. The fabricated polymer electrolyte exhibits a high ionic conductivity of 1.01 mS cm?1 at room temperature. 4.5 V NCM622//Li batteries achieve prolonged operation with a retention rate of 85.0% after 500 cycles at 0.5 C. This work provides new insights into molecular design and processibility design for polymer?based high?voltage batteries.
» Publication Date: 09/10/2023
This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement Nº 768737
