Evolving Zn anodes with high areal capacity at elevated depths of discharge (DOD) is crucial for scalable aqueous battery, yet plagued by dendritic growth and parasitic reactions. Here, we constructed a polymer protective layer (PDMAG@Zn) comprising hydrophobic poly(N,N-dimethylacrylamide) (PDMAA) and zincophilic cationic guar gum (CGG) via an in situ strategy. The moderately hydrophobic property of PDMAA prevents the "Grotthuss" effect on Zn surface to inhibit parasitic reactions while synergistically accelerates Zn2+ desolvation behavior with a molecular lubrication mechanism. Additionally, the PDMAG layer guides Zn2+ deposition along (100) plane for rapid stripping/plating performance. Coupled with CGG-induced interfacial stabilization, the symmetrical batteries achieve ultralong cycling of 6580 h at 1 mA cm−2, 1 mAh cm−2, and 300 h at 1 mA cm−2, 15 mAh cm−2 with 91.5% DODWeight. Furthermore, the Zn||V2O5 full battery delivers a high capacity of 335 mAh g−1 at 1 A g−1, underscoring superior feasibility in practical applications.
The severe dendrite issue of the Zn anode greatly hinders the practical application of aqueous zinc-ion batteries, which demands a prompt solution. This work proposes an electrostripping strategy using sodium citrate (SC) solution as the electrolyte to fabricate a 3D honeycomb-like Zn (3DH-Zn) anode. Theoretical calculations and experimental results reveal that SC preferentially adsorbs on the Zn(100) and Zn(101) planes and exhibits a shielding effect, leading to the major dissolution of Zn atoms from the Zn(002) plane, thus obtaining a honeycomb-like structure. Notably, convinced by morphology characterization and finite element simulation results, Zn 2+ tends to deposit on the lateral sides of the hexagonal holes on the 3DH-Zn anode, resulting in a flat deposition morphology dominated by Zn(101)/Zn(100) planes, which significantly inhibits dendrite formation. As a result, the 3DH-Zn symmetric cell achieves an ultra-long lifespan of 2000 h at 5.0 mA cm −2 and 1.0 mAh cm −2 . Besides, the 3DH-Zn||VO 2 full cell works for 1000 cycles at 1.0 A g −1 with a residual capacity of 123.1 mAh g −1 . This work opens up a new horizon for applying electrostripping strategy in designing advanced Zn anode.
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