A Practical Zinc Metal Anode Coating Strategy Utilizing Bulk h-BN and Improved Hydrogen Redox Kinetics

IF 13 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Dong Il Kim, Hee Bin Jeong, Jungmoon Lim, Hyeong Seop Jeong, Min Kyeong Kim, Sangyeon Pak, Sanghyo Lee, Geon-Hyoung An, Sang-Soo Chee, Jin Pyo Hong, SeungNam Cha, John Hong
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引用次数: 0

Abstract

Achieving high-performance aqueous zinc-ion batteries requires addressing the challenges associated with the stability of zinc metal anodes, particularly the formation of inhomogeneous zinc dendrites during cycling and unstable surface electrochemistry. This study introduces a practical method for scattering untreated bulk hexagonal boron nitride (h-BN) particles onto the zinc anode surface. During cycling, stabilized zinc fills the interstices of scattered h-BN, resulting in a more favorable (002) orientation. Consequently, zinc dendrite formation is effectively suppressed, leading to improved electrochemical stability. The zinc with scattered h-BN in a symmetric cell configuration maintains stability 10 times longer than the bare zinc symmetric cell, lasting 500 hours. Furthermore, in a full cell configuration with α-MnO2 cathode, increased H+ ion activity can effectively alter the major redox kinetics of cycling due to the presence of scattered h-BN on the zinc anode. This shift in H+ ion activity lowers the overall redox potential, resulting in a discharge capacity retention of 96.1% for 300 cycles at a charge/discharge rate of 0.5 A g−1. This study highlights the crucial role of surface modification, and the innovative use of bulk h-BN provides a practical and effective solution for improving the performance and stability.

Abstract Image

利用块状 h-BN 和改进的氢氧化还原动力学的实用锌金属阳极涂层策略
要实现高性能的锌离子水电池,就必须解决与锌金属阳极的稳定性有关的难题,特别是在循环过程中形成不均匀的锌枝晶和不稳定的表面电化学。本研究介绍了一种将未经处理的块状六方氮化硼(h-BN)颗粒散射到锌阳极表面的实用方法。在循环过程中,稳定的锌会填充散射的 h-BN 间隙,从而形成更有利的 (002) 取向。因此,锌枝晶的形成被有效抑制,从而提高了电化学稳定性。在对称电池配置中,带有散射 h-BN 的锌的稳定性是裸锌对称电池的 10 倍,可持续 500 小时。此外,在采用 α-MnO2 阴极的全电池配置中,由于锌阳极上存在分散的 h-BN,H+ 离子活性的增加可有效改变循环的主要氧化还原动力学。H+ 离子活性的这种变化降低了整体氧化还原电位,因此在充放电率为 0.5 A g-1 的条件下,300 个循环的放电容量保持率为 96.1%。这项研究强调了表面改性的关键作用,而创新性地使用块状 h-BN 则为提高性能和稳定性提供了一种实用而有效的解决方案。
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来源期刊
Energy & Environmental Materials
Energy & Environmental Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
17.60
自引率
6.00%
发文量
66
期刊介绍: Energy & Environmental Materials (EEM) is an international journal published by Zhengzhou University in collaboration with John Wiley & Sons, Inc. The journal aims to publish high quality research related to materials for energy harvesting, conversion, storage, and transport, as well as for creating a cleaner environment. EEM welcomes research work of significant general interest that has a high impact on society-relevant technological advances. The scope of the journal is intentionally broad, recognizing the complexity of issues and challenges related to energy and environmental materials. Therefore, interdisciplinary work across basic science and engineering disciplines is particularly encouraged. The areas covered by the journal include, but are not limited to, materials and composites for photovoltaics and photoelectrochemistry, bioprocessing, batteries, fuel cells, supercapacitors, clean air, and devices with multifunctionality. The readership of the journal includes chemical, physical, biological, materials, and environmental scientists and engineers from academia, industry, and policy-making.
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