Extrusion‐Based 3D Printing of Hierarchically Porous Advanced Battery Electrodes
Abstract
A highly porous 2D nanomaterial, holey graphene oxide (hGO), is synthesized directly from holey graphene powder and employed to create an aqueous 3D printable ink without the use of additives or binders. Stable dispersions of hydrophilic hGO sheets in water (≈100 mg mL−1) can be readily achieved. The shear‐thinning behavior of the aqueous hGO ink enables extrusion‐based printing of fine filaments into complex 3D architectures, such as stacked mesh structures, on arbitrary substrates. The freestanding 3D printed hGO meshes exhibit trimodal porosity: nanoscale (4–25 nm through‐holes on hGO sheets), microscale (tens of micrometer‐sized pores introduced by lyophilization), and macroscale (2) cathodes and characterized alongside 3D printed GO‐based materials without nanoporosity as well as nanoporous 2D vacuum filtrated films. The results indicate the synergistic effect between 2D nanomaterials, hierarchical porosity, and overall structural design, as well as the promise of a freeform generation of high‐energy‐density battery systems.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 30, 2018
- Source ID
- 10.1002/adma.201705651
Entities
People
- Boyang Liu
- Brady C. Zarket
- Dylan J. Kirsch
- Jiaqi Dai
- John W. Connell
- Joseph T. Morgenstern
- Laurence Q. Garcia
- Shaomao Xu
- Srinivasa R. Raghavan
- Steven D. Lacey
- Tingting Gao
- Yi Lin
- Yiju Li
- Ying Zhang
- Yonggang Yao
Organizations
- Langley Research Center
- National Institute of Aerospace
- National Science Foundation
- United States Department of Defense
- University of Maryland