用于锌离子水电池的高容量长寿命 SnO2@K-MnO2 阴极材料

IF 2.5 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Xiaoqing Jin, Yae Qi, Yongyao Xia
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引用次数: 0

摘要

锌//二氧化锰水溶液可充电锌离子电池(ZIB)因其安全、低成本和环保性,在电化学储能领域具有潜在的应用前景。然而,作为阴极材料的二氧化锰循环稳定性差、导电率低。本研究采用水热法制备了 SnO2@K-MnO2(SMO)复合材料,然后用 SnCl2 进行敏化处理,并以 SMO 作为 ZIB 的阴极材料考察了其电化学特性。在 0.5 A-g-1 条件下,可逆比容量达到 298.2 mA-h-g-1,循环 200 次后容量保持率达到 86%,在 10 A-g-1 条件下,放电容量高达 105 mA-h-g-1,长期循环寿命超过 8000 次,且无明显容量衰减。在质量负载为 5 mg-cm-2 时,这种正极在 2 A-g-1 条件下的循环寿命长达 2000 次,电池容量保持在 80%。充放电过程中的 XRD 和 SEM 证实了这种 Zn/SMO 电池中 H+/Zn2+ 的可逆共嵌入机制。这项研究成果可为开发先进的 ZIB 正极材料提供启示和推动作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A high-capacity and long-lifespan SnO2@K-MnO2 cathode material for aqueous zinc-ion batteries

Aqueous Zn//MnO2 rechargeable zinc-ion batteries (ZIBs) possess potential applications in electrochemical energy storage due to their safety, low cost, and environmental friendliness. However, manganese dioxide as the cathode material has poor cycle stability and low conductivity. In this work, the SnO2@K-MnO2 (SMO) composite was prepared using the hydrothermal method followed by the treatment with SnCl2 sensitization, and its electrochemical characteristics were examined using SMO as the cathode material for ZIBs. The reversible specific capacity reaches 298.2 mA·h·g−1 at 0.5 A·g−1, and an excellent capacity retention of 86% is realized after 200 cycles, together with a high discharge capacity of 105 mA·h·g−1 at 10 A·g−1 and a long-term cycling life of over 8000 cycles with no apparent capacity fade. This cathode exhibits a long cycle life up to 2000 cycles at 2 A·g−1 with the mass loading of 5 mg·cm−2, and the battery maintains the capacity of 80%. The reversible co-embedding mechanism of H+/Zn2+ in such a Zn//SMO battery was confirmed by XRD and SEM during the charge/discharge process. This work can enlighten and promote the development of advanced cathode materials for ZIBs.

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来源期刊
Frontiers of Materials Science
Frontiers of Materials Science MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
4.20
自引率
3.70%
发文量
515
期刊介绍: Frontiers of Materials Science is a peer-reviewed international journal that publishes high quality reviews/mini-reviews, full-length research papers, and short Communications recording the latest pioneering studies on all aspects of materials science. It aims at providing a forum to promote communication and exchange between scientists in the worldwide materials science community. The subjects are seen from international and interdisciplinary perspectives covering areas including (but not limited to): Biomaterials including biomimetics and biomineralization; Nano materials; Polymers and composites; New metallic materials; Advanced ceramics; Materials modeling and computation; Frontier materials synthesis and characterization; Novel methods for materials manufacturing; Materials performance; Materials applications in energy, information and biotechnology.
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