Boosting Electrolytic MnO2–Zn Batteries by a Bromine Mediator

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2021-10-11 DOI:10.1021/acs.nanolett.1c03319

Xinhua Zheng, Yongchao Wang, Yan Xu, Touqeer Ahmad, Yuan Yuan, Jifei Sun, Ruihao Luo, Mingming Wang, Mingyan Chuai, Na Chen, Taoli Jiang, Shuang Liu, Wei Chen*

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引用次数: 30

Abstract

An aqueous electrolytic MnO₂–Zn battery with eye-catching Mn²⁺/MnO₂ cathode chemistry has been attracting immense interest for next-generation energy storage devices due to its irreplaceable advantages. However, the limited MnO₂ conductivity restricts its long service life at high areal capacities. Here, we report a high-performance electrolytic MnO₂–Zn battery via a bromine redox mediator, to enhance its electrochemical performance. The MnO₂/Br₂–Zn battery displays a high discharge voltage of 1.98 V with a capacity of ～5.8 mAh cm^–2. It also shows an excellent rate performance of 20 C with a long-term stability of over 600 cycles. Furthermore, the scaled-up MnO₂/Br₂–Zn battery with a capacity of ～950 mAh exhibits a stable 100 cycles with a practical cell energy density of ～32.4 Wh kg^–1 and an attractively low energy cost of below 15 US$ kWh^–1. The design approach can be generalized to other electrodes and battery systems, thus opening up new possibilities for large-scale energy storage.

Abstract Image

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溴介质对电解MnO2-Zn电池的促进作用

水性电解MnO2 - zn电池具有引人注目的Mn2+/MnO2阴极化学性质，由于其不可替代的优势，已引起下一代储能设备的极大兴趣。然而，有限的MnO2电导率限制了其在高面积容量下的长使用寿命。在这里，我们报道了一种高性能的电解MnO2-Zn电池，通过溴氧化还原介质，以提高其电化学性能。MnO2/ Br2-Zn电池的放电电压高达1.98 V，容量为~5.8 mAh cm-2。它还显示了20℃的优异速率性能，具有超过600次循环的长期稳定性。此外，放大后的容量为~950 mAh的MnO2/ Br2-Zn电池表现出稳定的100次循环，实际电池能量密度为~32.4 Wh kg-1，能量成本低于15美元kWh-1。该设计方法可以推广到其他电极和电池系统，从而为大规模储能开辟了新的可能性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.