Local Electric Field Accelerates Zn2+ Diffusion Kinetics for Zn-V Battery

IF 24.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Advanced Energy Materials Pub Date : 2024-07-31 DOI:10.1002/aenm.202402416

Huibin Liu, Xiaohan Hou, Shiyuan Fan, Mingjun Cen, Zhuo Chen, Bin Chen, Chen Yuan, Wenchao Peng, Yang Li, Xiaobin Fan

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Abstract

Vanadium-based aqueous zinc-ion batteries (AZIBs) exhibit significant potential for large-scale energy storage applications, attributed to their inherent safety characteristics. Addressing the slow transport kinetics of divalent Zn²⁺ within the cathode lattice, thereby enhancing the rate capability and stability, is essential for the Zn-V battery system. In this study, a local electric field (LEF) strategy is introduced to accelerate the Zn²⁺ diffusion by creating abundant oxygen vacancies (Ov) in V₂O₅. Comprehensive characterization and density functional theory (DFT) calculations reveal the formation of the Ov induced atomic-level donor-acceptor couple configuration, verify and visualize the LEF. The fabricated LEF-enhanced vanadium oxide (LEF-VO) exhibits exceptional rate capability, achieving 338.3 mA h g⁻¹ at a current density of 10 A g⁻¹, and maintaining 66.4% of its capacity over a range from 0.2 to 20 A g⁻¹. Furthermore, the influence of the LEF on expediting Zn²⁺ diffusion kinetics is elucidated, correlating to the electrical force. This novel LEF approach offers valuable insights for advancing high-rate cathode materials.

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局部电场加速 Zn-V 电池的 Zn2+ 扩散动力学

钒基水性锌离子电池（AZIBs）因其固有的安全特性，在大规模储能应用方面具有巨大潜力。解决二价 Zn2+ 在阴极晶格内的缓慢传输动力学问题，从而提高速率能力和稳定性，对于锌-钒电池系统至关重要。本研究采用局部电场（LEF）策略，通过在 V2O5 中产生大量氧空位（Ov）来加速 Zn2+ 的扩散。综合表征和密度泛函理论（DFT）计算揭示了氧空位诱导的原子级供体-受体耦合构型的形成，验证并展示了局部电场。制备的 LEF 增强氧化钒（LEF-VO）表现出卓越的速率能力，在电流密度为 10 A g-1 时可达到 338.3 mA h g-1，并在 0.2 至 20 A g-1 的范围内保持 66.4% 的容量。此外，还阐明了 LEF 对加快 Zn2+ 扩散动力学的影响，并与电场力相关联。这种新颖的 LEF 方法为推动高倍率阴极材料的发展提供了宝贵的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advanced Energy Materials CHEMISTRY, PHYSICAL-ENERGY & FUELS

CiteScore

41.90

自引率

4.00%

发文量

889

审稿时长

1.4 months

期刊介绍： Established in 2011, Advanced Energy Materials is an international, interdisciplinary, English-language journal that focuses on materials used in energy harvesting, conversion, and storage. It is regarded as a top-quality journal alongside Advanced Materials, Advanced Functional Materials, and Small. With a 2022 Impact Factor of 27.8, Advanced Energy Materials is considered a prime source for the best energy-related research. The journal covers a wide range of topics in energy-related research, including organic and inorganic photovoltaics, batteries and supercapacitors, fuel cells, hydrogen generation and storage, thermoelectrics, water splitting and photocatalysis, solar fuels and thermosolar power, magnetocalorics, and piezoelectronics. The readership of Advanced Energy Materials includes materials scientists, chemists, physicists, and engineers in both academia and industry. The journal is indexed in various databases and collections, such as Advanced Technologies & Aerospace Database, FIZ Karlsruhe, INSPEC (IET), Science Citation Index Expanded, Technology Collection, and Web of Science, among others.

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