通过热压法构建具有高效离子传输路径的无溶剂LiFePO4卤水提锂电极OA

The development of high-mass-loading electrodes with robust ion transport characteristics is crucial for efficient electrochemical lithium extraction from brine.Herein,we report a solvent-free hot-pressing strategy to fabricate structurally engineered LiFePO4 electrodes with enhanced electrochemical performance and mechanical stability.By integrating etched titanium foil as a current collector and multi-walled carbon nanotubes as a conductive additive,a three-dimensionally interconnected porous structure was formed,enabling accelerated ion diffusion and improved structural integrity.Micro-CT and Avizo-based analysis revealed that the dry press-coated electrodes possess higher porosity,lower tortuosity and more connected ion channels compared to conventional slurry-coated electrodes.Electrochemical tests demonstrated a significantly higher lithium-ion diffusion coefficient and lower charge transfer resistance of the dry press-coated electrodes.Under optimized conditions,the dry press-coated electrodes,possessing a mass loading of 19.4 mg cm-2,delivered a lithium extraction capacity of 4.13 mg cm-2 with a purity of 93.91%over 15 cycles in simulated Uyuni brine.This work establishes a scalable hot-pressing method and elucidates its fundamental physicochemical advantages for lithium-selective electrochemical separation.