An Adaptive Dual‐Network Binder With Multiple‐Hydrogen‐Bond for Durable Aqueous Zn‐Ion Batteries

Abstract

The practical application of aqueous Zn‐ion batteries is limited by unstable cathode interfaces, sluggish Zn 2+ transport, and water‐induced structural degradation. Here we report a biomimetic adaptive dual‐network binder (DNB) with multiple‐hydrogen‐bond that simultaneously reinforces electrode mechanics, regulates interfacial wettability, and suppresses parasitic reactions. This binder integrates a hydrophobic polyvinylidene fluoride (PVDF) skeleton with a hydroxyl‐rich hydrophilic polydextrose (PDE) network, creating a stable interface environment that combines structural rigidity with interfacial adaptability. The rigid PVDF framework preserves electrode integrity, whereas the flexible and polar PDE chains strengthen interfacial adhesion, dissipates mechanical stress, and accelerates Zn 2+ transport. Meanwhile, the hydrophobic PVDF nanodomains mitigate active‐water attack on cathode materials, thereby reducing dissolution and structural collapse of the cathode. The fabricated Zn||V 2 O 5 full cell with the DNB binder delivers a high capacity of 211 mAh g −1 at 10 A g −1 with 90% retention over 3200 cycles. Even at 20 A g −1 , the full cell retains 183.4 mAh g −1 and 88% capacity after 6500 cycles. This binder further improves the performance of high‐loading coin cells (11.8 mg), pouch cells (14.86 mg cm −2 ), and is also extendable to α‐MnO 2 cathodes. This work establishes a general strategy for durable, fast‐charging cathodes through molecular‐level interface engineering.