Zinc-ion batteries (ZIBs) are considered promising energy sources for versatile and biocompatible gadgets as a result of their good sustainability and excessive intrinsic security. Nevertheless, their functions have been hindered by the problems of uncontrolled zinc dendrite development and water-induced facet reactions in standard liquid electrolytes. Herein, an ionically crosslinked composite hydrogel electrolyte primarily based on pure biomacromolecules, together with iota-carrageenan and sodium alginate, is designed to advertise extremely environment friendly and reversible Zn plating/stripping. The considerable purposeful teams of the macromolecules successfully suppress the reactivity of water molecules and facilitate uniform Zn deposition. Furthermore, the composite hydrogel electrolyte displays a excessive ionic conductivity of 5.89×10-2 S cm-1 and a Zn2+ transference variety of 0.58. Consequently, the Zn||Zn symmetric cell with the composite hydrogel electrolyte exhibits a steady cycle lifetime of greater than 500 h. In the meantime, the Zn||NH4V4O10 coin cell with the composite hydrogel electrolyte retains a excessive particular capability of roughly 200 mA h g-1 after 600 cycles at 2 A g-1. The Zn||NVO pouch cell primarily based on the hydrogel electrolyte additionally confirmed a excessive particular capability of 246.1 mAh g-1 at 0.5 A g-1 and retained 70.7% of its preliminary capability after 150 cycles. The pouch cell labored effectively at completely different bending angles and exhibited a capability retention fee of 98% after returning to the preliminary state from 180°-folding. This work goals to assemble high-performance hydrogel electrolytes through the use of low-cost pure supplies, which can present an answer for the applying of ZIBs in versatile biocompatible gadgets.
