镁离子掺杂和微结构工程辅助NH4V4O10作为高性能水系锌离子电池正极,Advanced Functional Materials

当前位置： X-MOL 学术 › Adv. Funct. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

镁离子掺杂和微结构工程辅助NH4V4O10作为高性能水系锌离子电池正极
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-07-14 , DOI: 10.1002/adfm.202306205
Xuri Wang ₁ , Yinglei Wang _{2,

3} , Ahmad Naveed ₁ , Guotai Li _{2,

3} , Hanwei Zhang ₁ , Yu Zhou ₁ , Aichun Dou ₁ , Mingru Su ₁ , Yunjian Liu ₁ , Ruiqiang Guo ₂ , Cheng Chao Li ₄

Affiliation

层状钒酸铵材料由于其分子量小和离子半径大而表现出显着的质量比容量和离子传输速率。^{然而，Zn 2+}和 V-O 键的强静电相互作用以及 NH ^… O 键的脆弱离子键阻碍了它们的发展。因此，本工作报道了具有花状形貌的Mg ²⁺掺杂NH ₄ V ₄ O _{10材料，以降低迁移能垒并抑制胺溶解。}由于3D花状形态以及Mg ^{2+和结构水的共同影响，Zn}²⁺^… VO的结合显着增强，并构建了额外的离子通道。预插层的 Mg ²⁺增强了结构完整性并防止不可逆脱氨，从而获得优异的循环稳定性。密度泛函理论（DFT）计算表明，MNVO 提供了更平滑的 Zn ²⁺扩散路径和更低的迁移势垒。得益于这些优点，MNVO正极在0.1 A g ^{-1下表现出410 mAh g}^-1的高比容量、令人满意的循环稳定性（5000次循环后在10 A g ^-1下容量保持率为90.2% ）和良好的倍率能力（ 118 mAh g ^-1 (25 A g ^-1 ) 在 0.4-1.5 V 范围内。此外，通过多次分析研究了 MNVO 阴极中的锌离子存储机制。

"点击查看英文标题和摘要"

Magnesium Ion Doping and Micro-Structural Engineering Assist NH4V4O10 as a High-Performance Aqueous Zinc Ion Battery Cathode

Layered ammonium vanadate materials exhibit significant mass-specific capacity and ion transport rate due to their small molecular weight and large ionic radius. However, the strong electrostatic interactions of Zn²⁺ and V–O bonds and the fragile ionic bonding of N-H^…O bonds hinder their development. Therefore, this work reports Mg²⁺ doping NH₄V₄O₁₀ materials accompanied by flower-like morphology to lower the migration energy barrier and inhibit amine dissolution. Owing to the 3D-flower-like morphology and the combined impact of Mg²⁺ and structural water, the binding of Zn²⁺^…V-O is significantly enhanced and additional ion channels were constructed. Pre-intercalated Mg²⁺ enhances the structural integrity and prevents irreversible deammoniation from obtaining excellent cyclic stability. Density functional theory (DFT) calculations show that MNVO provides a smoother Zn²⁺ diffusion path with a lower migration barrier. Benefited from these advantages, the MNVO cathode exhibits a high specific capacity of 410 mAh g⁻¹ at 0.1 A g⁻¹, satisfactory cyclic stability (90.2 % capacity retention at 10 A g⁻¹ after 5000 cycles), and capable rate ability (118 mAh g⁻¹ at 25 A g⁻¹) within 0.4-1.5 V. Furthermore, the zinc ion storage mechanism in the MNVO cathode is investigated through multiple analyses.

更新日期：2023-07-14

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南