Dynamic Imine Chemistry\nEnables Paintable Biogel Electrolytes\nto Shield On-Body Zinc-Ion Batteries from Interfacial Interference

On-body batteries with hydrogel electrolytes are a pivotal\nenabling\ntechnology to drive bioelectronics for healthcare and sports, yet\nthey are prone to failure due to dynamic interfacial interference,\naccompanied by e-waste production. Here, dynamic imine chemistry is\nproposed to design on-electrode paintable biogel electrolytes that\nfeature temperature-controlled reversible phase transition (gelling\nwithin 1.5 min) and ultrafast self-healing capability (6 s), establishing\na dynamically self-adaptive interface on cyclically deforming electrodes\nfor shielding on-body Zn-ion batteries from interfacial interference.\nConsequently, the deformed Zn anode shows an exceptional cycling stability\nof 400 h regardless of the bending radius, and the as-assembled Zn–I<sub>2</sub> battery delivers sufficient durability to endure 5000 deformation\ncycles, together extending to 1300 h and 15 000 deformation cycles\nvia dynamically restarting the interfacial electric field, respectively.\nAlso, the features of recyclability, biodegradation, and biocompatibility\nmake the proposed on-body Zn–I<sub>2</sub> batteries appealing\nin terms of sustainability and biosafety, enabling their successful\npower supply of heart rate monitors in sports. This work demonstrates\nthe promise of dynamic biogel chemistry for green and biorelated energy-storage\nsystems.