Design of Inorganic–Organic Hydrophobic Coating on Zn Anode Realizes Highly Reversible and Dendrite‐Free Zn‐Ion Batteries
Yuanyi Wang, Chen‐Yang Tian, Dong‐Ting Zhang, Bei Zhao, Yaqin Wang, Mao‐Cheng Liu
Abstract
The zinc‐ion battery (ZIB) has attracted wide attention due to its environmental protection, abundant reserves, and desirable theoretical capacity. However, the application of ZIBs is limited by the dendrite growth and side reactions on the Zn anode. Herein, a boron microparticles and polyvinylidene fluoride (PVDF) composite modified layer (B‐PVDF) is constructed on the surface of a Zn anode, and a Zn anode with hydrophobic coating is obtained (B‐PVDF@Zn). The hydrophobic PVDF modified layer prevents the direct contact between H 2 O molecules and Zn anode, while boron microparticles guide the flux of Zn 2+ ; thus, dendrite growth and side reactions are concurrently inhibited. And B‐PVDF@Zn//B‐PVDF@Zn symmetric battery maintains a stable overpotential (<45 mV) after 1050 h at a current density of 1 mA cm −2 with a planting capacity of 1 mAh cm −2 . The capacity retention rate of B‐PVDF@Zn//V 2 O 5 is 62.1% after 400 cycles, which shows improved cycle stability. The research proves the feasibility of the hydrophobic modified layer for the stable Zn anode; it supplies a new research idea for the diversity of Zn anode surface design.