TY - JOUR AU - Delekta, Szymon Sollami AU - Laurila, Mika‑Matti AU - Mäntysalo, Matti AU - Li, Jiantong PY - 2020/01/27 Y2 - 2024/03/29 TI - Drying-Mediated Self-Assembly of Graphene for Inkjet Printing of High-Rate Micro-supercapacitors JF - Nano-Micro Letters JA - Nano-Micro Lett VL - 12 IS - SE - Articles DO - 10.1007/s40820-020-0368-8 UR - https://www.nmlett.org/index.php/nml/article/view/517 SP - 40 AB - <p>Scalable fabrication of high-rate micro-supercapacitors (MSCs) is highly desired for on-chip integration of energy storage components. By virtue of the special self-assembly behavior of 2D materials during drying thin films of their liquid dispersion, a new inkjet printing technique of passivated graphene micro-flakes is developed to directly print MSCs with 3D networked porous microstructure. The presence of macroscale through-thickness pores provides fast ion transport pathways and improves the rate capability of the devices even with solid-state electrolytes. During multiple-pass printing, the porous microstructure effectively absorbs the successively printed inks, allowing full printing of 3D structured MSCs comprising multiple vertically stacked cycles of current collectors, electrodes, and sold-state electrolytes. The all-solid-state heterogeneous 3D MSCs exhibit excellent vertical scalability and high areal energy density and power density, evidently outperforming the MSCs fabricated through general printing techniques.</p><p>Highlights:</p><p>1 Based on the drying-mediated self-assembly behavior of passivated graphene, a new kind of 2D micro-flake inks is developed to directly print high-resolution patterns with multiscale porous microstructure.<br>2 The new ink allows to directly print complex 3D structures comprising multiple layers of heterogeneous materials.<br>3 High-rate all-solid-state 3D micro-supercapacitors have been fully inkjet-printed with an areal capacitance surpassing 10 mF cm<sup>−2</sup> at a high scan rate of 1 V s<sup>−1</sup>.</p> ER -