A homogeneous plating/stripping mode with fine grains for highly reversible Zn anodes,Energy & Environmental Science

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A homogeneous plating/stripping mode with fine grains for highly reversible Zn anodes
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2024-08-22 , DOI: 10.1039/d4ee02264e
Zhen Luo ₁ , Yufan Xia ₁ , Shuang Chen ₁ , Xingxing Wu ₂ , Esther Akinlabi ₃ , Ben Bin Xu ₃ , Hongge Pan _{1,

4} , Mi Yan ₁ , Yinzhu Jiang _{1,

2}

Affiliation

Aqueous zinc metal batteries (AZMBs) have emerged as an attractive energy storage option due to their operational safety, low cost, and environmentally friendly nature. However, the hexagonal close-packed (hcp) Zn anode always exhibits dendritic plating/stripping behavior due to the uncontrollable nucleation and growth of hexagonal platelets, which severely hinders its further development. Herein, we regulate both nucleation and Zn/Zn²⁺ redox kinetics to enable a homogeneous plating/stripping mode with fine grains, significantly improving the stability and reversibility of the Zn anode. Surface overpotential, which directly determines the nucleation behavior, is prominently amplified by the adsorption of added cordycepin (Cor) on the Zn anode surface. Therefore, a promoted nucleation process with the formation of small-sized Zn grains is achieved. The mitigated Zn growth/dissolution rate caused by the strong steric hindrance effect of Cor further ensures the granular morphology after cycling. Owing to this dual regulation strategy, the Zn anode delivers superior cycling stability of the Zn‖Zn symmetric cell over 900 h at 5 mA cm⁻² and an ultra-high cumulative plating capacity of 3 A h cm⁻² at 10 mA cm⁻². The concept also works in Zn‖Cu asymmetric cells and Zn‖NaV₃O₈·1.5H₂O (NVO) full cells, facilitating excellent reversibility and cycling performance. This work presents a new mode for Zn plating/stripping, which will make highly reversible AZMBs achievable.

中文翻译：

用于高度可逆锌阳极的细晶粒均匀电镀/剥离模式

水性锌金属电池（AZMB）由于其操作安全、低成本和环保的特性而成为一种有吸引力的能源存储选择。然而，由于六方片晶的成核和生长不可控，六方密排（hcp）锌负极始终表现出枝晶镀/剥离行为，严重阻碍了其进一步发展。在此，我们调节成核和Zn/Zn ²⁺氧化还原动力学，以实现具有细晶粒的均匀电镀/剥离模式，显着提高Zn阳极的稳定性和可逆性。表面过电势直接决定成核行为，通过添加虫草素 (Cor) 在锌阳极表面的吸附而显着放大。因此，促进了成核过程，形成了小尺寸的锌晶粒。 Cor的强位阻效应导致Zn生长/溶解速率减缓，进一步保证了循环后的颗粒形态。由于这种双重调节策略，锌阳极在 5 mA cm ^-2下提供了 Zn‖Zn 对称电池超过 900 小时的卓越循环稳定性，并在 10 mA cm -2 下具有 3 A h cm ^-2的超高累积电镀容量^{- 2} .该概念也适用于 Zn‖Cu 不对称电池和 Zn‖NaV ₃ O ₈ ·1.5H ₂ O (NVO) 全电池，具有出色的可逆性和循环性能。这项工作提出了一种新的镀锌/剥离模式，这将使高度可逆的 AZMB 成为可能。

更新日期：2024-08-22

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