School of Chemistry and Chemical Engineering, Inner Mongolia University, 010021, Hohhot, China.
State Key Lab of Organic-Inorganic Composites, Beijing University of Chemical Technology, 100029, Beijing, P. R. China.
Angew Chem Int Ed Engl. 2023 Jun 26;62(26):e202303529. doi: 10.1002/anie.202303529. Epub 2023 May 17.
Vanadium based compounds are promising cathode materials for aqueous zinc (Zn)-ion batteries (AZIBs) due to their high specific capacity. However, the narrow interlayer spacing, low intrinsic conductivity and the vanadium dissolution still restrict their further application. Herein, we present an oxygen-deficient vanadate pillared by carbon nitride (C N ) as the cathode for AZIBs through a facile self-engaged hydrothermal strategy. Of note, C N nanosheets can act as both the nitrogen source and pre-intercalation species to transform the orthorhombic V O into layered NH V O with expanded interlayer spacing. Owing to the pillared structure and abundant oxygen vacancies, both the Zn ion (de)intercalation kinetics and the ionic conductivity in the NH V O cathode are promoted. As a result, the NH V O cathode delivers exceptional Zn-ion storage ability with a high specific capacity of about 370 mAh g at 0.5 A g , a high-rate capability of 194.7 mAh g at 20 A g and a stable cycling performance of 10 000 cycles.
基于钒的化合物由于其高比容量而成为用于水系锌（Zn）离子电池（AZIB）的有前途的阴极材料。然而，层间距较窄、本征电导率低和钒溶解仍然限制了它们的进一步应用。在此，我们通过简便的自组装水热策略提出了一种由氮化碳（C3N4）柱撑的缺氧钒酸盐作为 AZIB 的阴极。值得注意的是，C3N4纳米片既可以作为氮源，也可以作为预插层物质，将正交 V2O5转化为具有扩展层间距的层状 NH4V2O5。由于层柱结构和丰富的氧空位，NH4V2O5阴极中的 Zn 离子（脱）插层动力学和离子电导率都得到了提高。结果，NH4V2O5阴极具有出色的 Zn 离子存储能力，在 0.5 A g-1时比容量约为 370 mAh g-1，在 20 A g-1时具有 194.7 mAh g-1的高倍率性能，以及 10000 次循环的稳定循环性能。
