High-precision 3D printed octet-truss microlattices for electrochemical energy storage devices

High-precision three-dimensional (3D) printing has enabled the fabrication of architected microlattices with complex geometries and tunable functionalities, offering new opportunities for electrochemical energy storage devices. In particular, 3D polymer octet-truss lattice frameworks exhibit exceptional mechanical robustness, structural regularity, and customizable porosity, making them promising candidates for electrode applications. However, current fabrication techniques often face challenges in achieving the required precision and structural integrity for advanced applications. In this study, projection micro stereolithography (PμSL) was utilized to fabricate high-resolution 3D electrode substrates based on octet-truss microlattices. The printed structures were systematically optimized for both mechanical stability and printing accuracy. Electrochemical plating and magnetron sputtering were employed as surface modification techniques to improve the physicochemical characteristics of the lattices and introduce lithium-affinitive functionality. The resulting 3D microlattice electrodes demonstrate high structural precision and enhanced electrochemical performance, highlighting their strong potential for integration into advanced lithium metal batteries and related energy storage systems.

高精度三维（3D）打印技术可制备具备复杂几何构型与可调谐功能的结构化微点阵，为电化学储能器件开辟了全新发展路径。具体而言，三维聚合物八面体桁架点阵框架展现出优异的机械稳定性、结构规整性与可定制孔隙率，使其成为电极应用领域极具潜力的候选方案。然而，当前的制备工艺往往难以满足先进应用对精度与结构完整性的严苛要求。本研究采用投影微立体光刻（projection micro stereolithography, PμSL）技术，以八面体桁架微点阵为结构基础，制备了高分辨率三维电极基底。研究人员针对机械稳定性与打印精度两个维度，对打印结构开展了系统性优化。采用电化学镀覆与磁控溅射两种表面改性工艺，对点阵的物理化学特性进行优化，并引入亲锂功能。所制备的三维微点阵电极兼具极高的结构精度与提升后的电化学性能，凸显了其在先进锂金属电池及相关储能系统中集成应用的广阔前景。