锌金属上的 CaTiO3 保护层为水性锌离子电池带来卓越的循环可逆性和动力学性能

IF 13.1 1区 化学 Q1 Energy
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引用次数: 0

摘要

锌离子水电池(AZIBs)具有安全、低成本、电池组装条件简单和离子导电率高等优点,因此受到了广泛关注。然而,它们仍然存在一些严重问题,包括无法控制的枝晶生长、腐蚀、水分解产生的氢进化反应(HER)、电极钝化和意外副产物。在锌阳极表面形成均匀的人工纳米晶层是解决这些问题的一个很有前景的策略。在此,我们提出在 Zn(CTO@Zn)上使用包晶 CaTiO3(CTO)保护层作为提高 AZIB 性能的一种可行方法。CTO 人工层具有高介电常数(εr = 180)和铁电特性,可使偶极矩排列整齐并重新分配 CTO 层中的 Zn2+ 离子,从而为 Zn 离子向 Zn 金属扩散提供了有效途径。通过避免 Zn 阳极与电解质溶液直接接触,树枝状晶粒的不均匀生长、腐蚀、寄生副反应和 HER 等问题都得到了缓解,同时 CTO 在循环过程中保持了其机械和化学稳定性。因此,与裸锌相比,CTO@Zn 在对称电池配置中的寿命有所提高。在 1 mA cm-2/0.5 mA h cm-2 的条件下,CTO@Zn 在 1500 小时内显示出稳定的过电位(∼68 mV),优于裸锌。此外,当与 V2O5-C 阴极配对时,CTO@Zn//V2O5-C 全电池在循环 300 次后可提供 148.4 mA h g-1(基于阴极的质量)。这项研究为锌金属阳极和高性能 AZIB 的开发提供了新的视角。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Prominent cycling reversibility and kinetics enabled by CaTiO3 protective layer on Zn metal for aqueous Zn-ion batteries

Prominent cycling reversibility and kinetics enabled by CaTiO3 protective layer on Zn metal for aqueous Zn-ion batteries

Aqueous Zn-ion batteries (AZIBs) have received considerable attention owing to their various advantages such as safety, low cost, simple battery assembly conditions, and high ionic conductivity. However, they still suffer from serious problems, including uncontrollable dendrite growth, corrosion, hydrogen evolution reaction (HER) from water decomposition, electrode passivation, and unexpected by-products. The creation of a uniform artificial nanocrystal layer on the Zn anode surface is a promising strategy for resolving these issues. Herein, we propose the use of a perovskite CaTiO3 (CTO) protective layer on Zn (CTO@Zn) as a promising approach for improving the performance of AZIBs. The CTO artificial layer provides an efficient pathway for Zn ion diffusion towards the Zn metal because of the high dielectric constant (εr = 180) and ferroelectric characteristics that enable the alignment of dipole moments and redistribute the Zn2+ ions in the CTO layer. By avoiding the direct contact of the Zn anode with the electrolyte solution, the uneven dendrite growth, corrosion, parasitic side reactions, and HER are mitigated, while CTO retains its mechanical and chemical robustness during cycling. Consequently, CTO@Zn demonstrates an improved lifespan in a symmetric cell configuration compared with bare Zn. CTO@Zn shows steady overpotential (∼68 mV) for 1500 h at 1 mA cm−2/0.5 mA h cm−2, excelling bare Zn. Moreover, when paired with the V2O5-C cathode, the CTO@Zn//V2O5-C full battery delivers 148.4 mA h g−1 (based on the mass of the cathode) after 300 cycles. This study provides new insights into Zn metal anodes and the development of high-performance AZIBs.

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来源期刊
Journal of Energy Chemistry
Journal of Energy Chemistry CHEMISTRY, APPLIED-CHEMISTRY, PHYSICAL
CiteScore
19.10
自引率
8.40%
发文量
3631
审稿时长
15 days
期刊介绍: The Journal of Energy Chemistry, the official publication of Science Press and the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, serves as a platform for reporting creative research and innovative applications in energy chemistry. It mainly reports on creative researches and innovative applications of chemical conversions of fossil energy, carbon dioxide, electrochemical energy and hydrogen energy, as well as the conversions of biomass and solar energy related with chemical issues to promote academic exchanges in the field of energy chemistry and to accelerate the exploration, research and development of energy science and technologies. This journal focuses on original research papers covering various topics within energy chemistry worldwide, including: Optimized utilization of fossil energy Hydrogen energy Conversion and storage of electrochemical energy Capture, storage, and chemical conversion of carbon dioxide Materials and nanotechnologies for energy conversion and storage Chemistry in biomass conversion Chemistry in the utilization of solar energy
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