3 × 3 隧道τ-MnO2 正极与 Mg2(OH)3Cl-4H2O 之间的异质界面协同作用，实现长循环寿命锌离子水电池

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Applied Nano Materials Pub Date : 2024-10-29 DOI:10.1039/d4qi02572e

Fang Xu, Jialin Zheng, Dai-Huo Liu, Ao Wang, Zhenjiang Li, Chunyan Xu, Mengqin Song, Beinuo Zhang, Zhengyu Bai, Zhongwei Chen

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引用次数: 0

摘要

二氧化锰被认为是锌离子水电池理想的阴极候选材料。然而，二氧化锰的低导电性和纳米结构退化阻碍了它的进一步应用。本文通过添加过量的 Mg2+ 合成了一种 3 × 3 隧道结构的 τ-MnO2 阴极材料。在制备过程中，一部分Mg2+嵌入τ-MnO2的3 × 3隧道中以稳定微观结构，另一部分Mg2+在τ-MnO2附近形成新相，即Mg2(OH)3Cl-4H2O，从而制备出具有τ-MnO2和Mg2(OH)3Cl-4H2O异质界面协同作用的阴极材料。τ-MnO2和Mg2(OH)3Cl-4H2O之间异质界面的电荷排列产生了更多的活性位点，加速了离子扩散动力学。Mg2(OH)3Cl-4H2O的引入增加了Mn(IV)的比例，抑制了由Jahn-Teller畸变引起的结构不稳定性，从而改善了τ-MnO2阴极的电化学性能（在1 A g-1条件下循环1800次后容量保持率为86.7%）。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Heterointerface synergy between a 3 × 3 tunnel τ-MnO2 cathode and Mg2(OH)3Cl·4H2O for achieving long cycle-life aqueous zinc-ion batteries

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Heterointerface synergy between a 3 × 3 tunnel τ-MnO2 cathode and Mg2(OH)3Cl·4H2O for achieving long cycle-life aqueous zinc-ion batteries

Manganese dioxide is considered an ideal cathode candidate material for aqueous zinc-ion batteries. However, its poor conductivity and nanostructural degeneration impede its further application. Herein, a 3 × 3 tunnel-structured τ-MnO₂ cathode material was synthesized through the addition of excessive Mg²⁺. During its preparation, a portion of Mg²⁺ was embedded into the 3 × 3 tunnel of τ-MnO₂ to stabilize the microstructure, while another portion of Mg²⁺ formed a new phase, i.e., Mg₂(OH)₃Cl·4H₂O, adjoining τ-MnO₂, resulting in a cathode material with heterointerface synergy between τ-MnO₂ and Mg₂(OH)₃Cl·4H₂O. The charge arrangement of the heterointerface between τ-MnO₂ and Mg₂(OH)₃Cl·4H₂O enabled more active sites and accelerated ion-diffusion kinetics. The introduction of Mg₂(OH)₃Cl·4H₂O increased the proportion of Mn(IV) and suppressed the structural instability caused by Jahn–Teller distortion, thereby improving the electrochemical performance of the τ-MnO₂ cathode (capacity retention of 86.7% after 1800 cycles at 1 A g⁻¹).

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来源期刊

ACS Applied Nano Materials Multiple-

CiteScore

8.30

自引率

3.40%

发文量

1601

期刊介绍： ACS Applied Nano Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics and biology relevant to applications of nanomaterials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important applications of nanomaterials.