【摘要】 构建具有优异离子传输特性的高载量电极，对于通过电化学方法从卤水中高效提取锂至关重要。本文报道了一种无溶剂热压策略，用于制造结构优化的LiFePO₄电极，该电极具有优异的电化学性能和机械稳定性。通过采用蚀刻钛箔作为集流体，并引入多壁碳纳米管作为导电添加剂，成功构建了三维互连的多孔结构，从而加速了离子扩散并提高了电极结构的完整性。基于Micro-CT和Avizo分析的结果表明：与传统湿法涂覆电极相比，热压电极具有更高的孔隙率、更低的曲折度以及更连通的离子传输通道。电化学测试表明，热压电极具有更高的锂离子扩散系数和更低的电荷转移电阻。在优化条件下，质量负载为19.4 mg cm^-2的热压电极在Uyuni模拟卤水中经过15次循环后，锂提取容量达到4.13 mg cm^-2，纯度为93.91%。本研究建立了一种可扩展的热压方法，并阐明了其在锂选择性电化学分离中的基本物理化学优势。更多还原

【Abstract】 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.更多还原