A Liquid Metal Microdroplets Initialized Hemicellulose Composite for 3D Printing Anode Host in Zn-Ion Battery

Maintaining a steady affinity between gallium-based liquid metals (LM) and polymer binders, particularly under continuous mechanical deformation, such as extrusion-based 3D printing or plating/stripping of Zinc ion (Zn2+), is very challenging. Here, an LM-initialized polyacrylamide-hemicellulose/EGaIn microdroplets hydrogel is used as a multifunctional ink to 3D-print self-standing scaffolds and anode hosts for Zn-ion batteries. The LM microdroplets initiate acrylamide polymerization without additional initiators and cross-linkers, forming a double-covalent hydrogen-bonded network. The hydrogel acts as a framework for stress dissipation, enabling recovery from structural damage due to the cyclic plating/stripping of Zn2+. The LM-microdroplet-initialized polymerization with hemicelluloses can facilitate the production of 3D printable inks for energy storage devices.

Automated summary

Maintaining a steady affinity between gallium-based liquid metals and polymer binders is challenging for continuous mechanical deformation applications. In this study, a LM-initialized polyacrylamide-hemicellulose/EGaIn microdroplets hydrogel is developed as a multifunctional ink for 3D-printing self-standing scaffolds and anode hosts for Zn-ion batteries. The hydrogel acts as a framework for stress dissipation, allowing for recovery from structural damage caused by cyclic plating/stripping of Zn2+.