具有高活性和稳定性的非晶态锌布锌水系锌离子电池,Journal of Materials Chemistry A

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具有高活性和稳定性的非晶态锌布锌水系锌离子电池
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-12-13 , DOI: 10.1039/d2ta08676j
Zhi-Qiang Wang _{1,

2} , Xiao-Dong Liu _{1,

2} , Hong-Ming Chen _{1,

2} , Xiang-Yu Zhu ₃ , Li-Ying Song _{1,

2} , Yun-Guo Yang _{1,

2} , Jing Bai _{1,

2} , M. J. Kim ₃ , Woon-Ming Lau _{1,

2} , Federico Rosei ₄ , Dan Zhou _{1,

2}

Affiliation

无定形锰氧化物 (a-MnO _x ) 被广泛认为是用于制造水性锌离子电池 (AZIB) 阴极的有前途的材料系统。然而，a-MnO _x的储锌机制仍不明朗，其电化学性能不足。在此，我们报道了多孔还原氧化石墨烯增强的 a-MnO _x微球（表示为 PrGO–MnO _x）作为 AZIB 的阴极材料。通过一系列非原位测量阐明了其电化学储锌机制。特别是，我们观察到PrGO-MnO _{x中的 a-MnO}_x相在初始循环期间转化为高活性和稳定的无定形锌锌镁石，有效促进锌储存。该正极材料可以提供大容量（在 0.1 A g ^-1下循环 100 次后为296 mA hg ^-1）、高倍率能力（在 2.5 A g ^{-1下为 151 mA hg}^-1）和超长寿命（5000在 5.0 A g ⁻¹下循环）。我们将这种性能归因于几个特性，包括 (i) 具有高活性和稳定性的 Zn-buserite 的无定形结构，(ii) 快速反应动力学，(iii) 增加的电子电导率，(iv) 提高的 Zn ²⁺扩散速率，以及(v) 高赝电容。我们还组装了 PrGO-MnO _x‖AQ（9,10-蒽醌）全电池，具有高放电平台（0.8 V）和令人印象深刻的循环稳定性（在 0.3 A g −1 下 500 次循环后为 106 mA hg ⁻¹）^，表明具有良好的实际应用潜力.

"点击查看英文标题和摘要"

Aqueous Zn-ion batteries using amorphous Zn-buserite with high activity and stability

Amorphous manganese oxides (a-MnO_x) are widely considered promising material systems to fabricate cathodes for aqueous zinc ion batteries (AZIBs). However, the Zn-storage mechanism of a-MnO_x is still not understood, and its electrochemical performance is inadequate. Herein, we report porous reduced graphene oxide boosted a-MnO_x microspheres (denoted as PrGO–MnO_x) as a cathode material for AZIBs. Its electrochemical Zn-storage mechanism was elucidated via a series of ex situ measurements. Particularly, we observe that the a-MnO_x phase in PrGO–MnO_x is transformed into highly active and stable amorphous Zn-buserite during the initial cycles, effectively promoting Zn-storage. The cathode material can deliver a large capacity (296 mA h g⁻¹ after 100 cycles at 0.1 A g⁻¹), high-rate capability (151 mA h g⁻¹ at 2.5 A g⁻¹), and ultra-long lifespan (5000 cycles at 5.0 A g⁻¹). We attribute this performance to several properties, including (i) the amorphous structure of Zn-buserite with high activity and stability, (ii) fast reaction kinetics, (iii) increased electron conductivity, (iv) improved Zn²⁺ diffusion rate, and (v) high pseudocapacitance. We also assembled a PrGO–MnO_x‖AQ (9,10-anthraquinone) full-battery, which possesses a high discharge plateau (0.8 V) and impressive cycling stability (106 mA h g⁻¹ after 500 cycles at 0.3 A g⁻¹), indicating good potential towards practical applications.

更新日期：2022-12-13

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