揭示涂有二维纳米材料保护层的锌阳极对高性能水性锌离子电池的长期稳定性机理

IF 10.7 Q1 CHEMISTRY, PHYSICAL EcoMat Pub Date : 2024-08-14 DOI:10.1002/eom2.12482
Yunhee Ahn, Jueun Baek, Seulgi Kim, Ingyu Choi, Jungjoon Yoo, Segi Byun, Dongju Lee
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引用次数: 0

摘要

可充电锌(Zn)离子水电池(AZIBs)因其低成本、高安全性和环保性而在大规模储能领域越来越受欢迎;然而,锌金属阳极中的枝晶生长和副反应限制了其实际应用。此外,开发成功钝化锌阳极的难度以及大面积涂覆保护层仍然是 AZIBs 商业化的主要限制因素。在这里,我们介绍了二维(2D)纳米材料,包括 MoS2、h-BN 和 Ti3C2Tx MXene,作为锌阳极的保护层,采用可扩展的大面积喷涂工艺在锌表面形成。对电化学性能相关材料特性的研究表明,具有最佳厚度的特定类型二维材料可以防止锌枝晶的垂直生长,以及包括氢演化和腐蚀在内的副反应,从而使器件即使在苛刻的测量条件下也能以最小的过电位稳定运行,并延长使用寿命。与裸锌//MnO2 电池相比,高度稳定的 MoS2@Zn 阳极使 MoS2@Zn//MnO2 全电池实现了更稳定的容量保持。我们基于溶液的多功能、可扩展涂层技术可在锌阳极上轻松形成大面积二维保护层,这为提高 AZIB 的可靠性和性能提供了新的视角。
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Unveiled mechanism of prolonged stability of Zn anode coated with two-dimensional nanomaterial protective layers toward high-performance aqueous Zn ion batteries

Rechargeable aqueous zinc (Zn) ion batteries (AZIBs) are gaining popularity in large-scale energy storage due to their low cost, high safety, and environmental friendliness; however, dendrite growth and side reactions in Zn metal anodes limit their practical applications. Additionally, the difficulty of developing successful passivation of Zn anodes, combined with large-area coating of protective layers, remains a major limitation to the commercialization of AZIBs. Here, we introduce two-dimensional (2D) nanomaterials including MoS2, h-BN, and Ti3C2Tx MXene as protective layers for Zn anodes, created on a Zn surface using a scalable, large-area spray-coating process. Examinations of electrochemical performance-related material characterizations revealed that a specific type of 2D material with an optimal thickness prevents vertical growth of Zn dendrites, as well as side reactions including hydrogen evolution and corrosion, resulting in stable device operation with minimal overpotential and extended life, even under harsh measurement conditions. The highly stable MoS2@Zn anode allowed the MoS2@Zn//MnO2 full cell to achieve significantly more stable capacity retention, compared with the bare Zn//MnO2 cell. Our versatile and scalable solution-based coating technique for easily forming large-area 2D protective layers on Zn anodes offers new insights concerning improvements to AZIB reliability and performance.

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来源期刊
CiteScore
17.30
自引率
0.00%
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0
审稿时长
4 weeks
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