Ion-Molecule Co-Confining Ammonium Vanadate Cathode for High-Performance Aqueous Zinc-Ion Batteries,Small

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Ion-Molecule Co-Confining Ammonium Vanadate Cathode for High-Performance Aqueous Zinc-Ion Batteries
Small ( IF 13.0 ) Pub Date : 2023-12-28 , DOI: 10.1002/smll.202311029
Yu Qiu ₁ , Zhihao Sun ₁ , Zihao Guo ₁ , Benli Du ₁ , Han Ding ₁ , Peng Wang ₁ , Shaoyao Tian ₁ , Lei Qian ₁

Affiliation

Vanadium-based cathode materials have attracted great attention in aqueous zinc-ion batteries (AZIBs). However, the inferior ion transport and cyclic stability due to the strong Coulomb interaction between Zn²⁺ and the lattice limit their further application. In this work, CO₂ molecules are in situ embedded in the interlayer structure of NH₄V₄O₁₀ by decomposing excess H₂C₂O₄·2H₂O in the main framework, obtaining an ion-molecule co-confining NH₄V₄O₁₀ for AZIB cathode material. The introduced CO₂ molecules expanded the interlayer spacing of NH₄V₄O₁₀, broadened the diffusion channel of Zn²⁺, and stabilized the structure of NH₄V₄O₁₀ as the interlayer pillars together with

, which effectively improved the Zn²⁺ diffusion kinetics and cycle stability of the electrode. In addition, the binding between

and the host framework is stabilized via hydrogen bonds with CO₂ molecules. NVO-CO₂-0.8 exhibited excellent specific capacity (451.1 mAh g⁻¹ at 2 A g⁻¹), cycle stability (214.0 mAh g⁻¹ at 10 A g⁻¹ after 1000 cycles) and rate performance. This work provides new ideas and approaches for optimizing vanadium-based materials with high-performance AZIBs.

中文翻译：

用于高性能水系锌离子电池的离子分子共约束钒酸铵正极

钒基正极材料在水系锌离子电池（AZIB）中引起了极大的关注。然而，由于Zn ²⁺与晶格之间的强库仑相互作用，其离子传输和循环稳定性较差，限制了其进一步应用。该工作通过分解主骨架中多余的H ₂ C ₂ O ₄ ·2H ₂ O，将CO ₂分子原位嵌入NH ₄ V ₄ O ₁₀的层间结构中，得到离子-分子共约束NH ₄ V ₄ O ₁₀为AZIB正极材料。引入的CO ₂分子扩大了NH ₄ V ₄ O ₁₀的层间距，加宽了Zn ²⁺的扩散通道，并稳定了NH ₄ V ₄ O ₁₀作为层间支柱的结构。

，有效提高了电极的Zn ²⁺扩散动力学和循环稳定性。此外，之间的绑定

主体框架通过与CO ₂分子的氢键稳定。 NVO-CO ₂ -0.8 表现出优异的比容量（2 A g ^-1下451.1 mAh g ^-1 ）、循环稳定性（1000次循环后10 A g ^-1下214.0 mAh g ^-1 ）和倍率性能。这项工作为优化高性能 AZIB 钒基材料提供了新的思路和方法。

更新日期：2023-12-28

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