Considering the desired energy density, safety and cost-effectiveness, rechargeable zinc-ion batteries (ZIBs) are regarded as one of the most promising energy storage units in next-generation energy systems. Nonetheless, the service life of the current ZIBs is significantly limited by rampant dendrite growth and severe parasitic reactions occurring on the anode side. To overcome these issues caused by poor interfacial ionic conduction and water erosion, we have developed a facile strategy to fabricate a uniform zinc borate layer at the zinc anode/electrolyte interface (ZnBO). Such protective layer integrates superhydrophobic-zincopholic properties, which can effectively eliminate the direct contact of water molecules on the anode, and homogenize the interfacial ionic transfer, thereby enhancing the cyclic stability of the zinc plating/stripping. As a result, the as-prepared ZnBO-coated anode exhibits extended lifespan of 1200 h at 1 mA cm −2 and demonstrates remarkable durability of 570 h at 20 mA cm −2 in Zn||Zn symmetric cells. Additionally, when coupled to an NH 4 V 4 O 10 (NVO) cathode, it also delivers a superior cyclability (203.5 mAh/g after 2000 cycles at 5 A/g, 89.3 % capacity retention) in coin full cells and a feasible capacity of 2.5 mAh at 1 A/g after 200 cycles in pouch full cells. This work offers a unique perspective on integrating hydrophobicity and zincophilicity at the anode/electrolyte interface through an artificial layer, thereby enhancing the cycle lifespan of ZIBs.
Zinc metal is an excellent anode material due to its high theoretical capacity, low cost, good safety, and many other advantages. However, uncontrollable side reactions and dendrite growth remain significant challenges in developing aqueous zinc-ion batteries (ZIBs). Building artificial coatings is one of the most effective strategies for addressing these problems. Herein, porous layered basic zinc acetate nanosheets (LBZA) were innovatively constructed to protect zinc anodes (LBZA@Zn) against uncontrollable side reactions and dendrite growth in aqueous ZIBs. The hydrophobic and positively charged surface eventually constructs a local high-concentration region, thereby facilitating the dissociation and transport of Zn2+, as well as reducing the hydrogen evolution reaction and the by-product growth of the Zn anode. The LBZA@Zn∥LBZA@Zn symmetrical cell has a cycling stability of 1800 h at 2 mA cm−2 and 1 mA h cm−2. While the LBZA@Zn∥Cu cell maintains stable deposition of Zn2+ after 5000 cycles at 1 mA cm−2 and 0.5 mA h cm−2, with a high average coulombic efficiency of 99.91%. These findings provide new ideas for the construction of efficient artificial coatings.
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