Extrusion‐Based 3D Printing of Hierarchically Porous Advanced Battery Electrodes

• DOI: 10.1002/adma.201705651
• Publication Date: 2018-01-30T14:49:54Z
• Authors: Steven D. Lacey; Dylan J. Kirsch; Yiju Li; Joseph T. Morgens...; Brady C. Zarket; Yonggang Yao; Jiaqi Dai; Laurence Q. Garcia; Boyang Liu; Tingting Gao; Shaomao Xu; Srinivasa R. Ragh...; John W. Connell; Yi Lin; Liangbing Hu
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

A highly porous 2D nanomaterial, holey graphene oxide (hGO), is synthesized directly from powder and employed to create an aqueous 3D printable ink without the use of additives or binders. Stable dispersions hydrophilic hGO sheets in water (≈100 mg mL-1 ) can be readily achieved. The shear-thinning behavior enables extrusion-based printing fine filaments into complex architectures, such as stacked mesh structures, on arbitrary substrates. freestanding printed meshes exhibit trimodal porosity: nanoscale (4-25 nm through-holes sheets), microscale (tens micrometer-sized pores introduced by lyophilization), macroscale (<500 µm square design), which are advantageous for high-performance energy storage devices that rely interfacial reactions promote full active-site utilization. To elucidate benefit (nano)porosity structurally conscious designs, additive-free architectures demonstrated first lithium-oxygen (Li-O2 cathodes characterized alongside GO-based materials nanoporosity well nanoporous vacuum filtrated films. results indicate synergistic effect between nanomaterials, hierarchical porosity, overall structural design, promise a freeform generation high-energy-density battery systems.