Xueli Bi, Qianqian Zhang, Wenhua Gao, Shanshan Liu, Ye Liu, Xin Yang, Yanyang Han* and Kai Feng*,
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引用次数: 0
摘要
锌离子水电池（AZIBs）在大规模储能系统领域具有广泛的应用前景。缺乏合适的阴极材料是限制 AZIBs 发展的一个重要因素。多阴离子磷酸Mg3V4(PO4)6具有稳定的三维框架结构和开放的锌离子传输通道，有利于锌离子的储存。本文合成了碳包覆 Mg3V4(PO4)6@C 阴极材料，并首次研究了其锌离子存储特性。得益于开放的离子传输通道和快速电子传输路径，Mg3V4(PO4)6@C 显示出良好的电化学性能。在 0.04 A-g-1 的条件下，Mg3V4(PO4)6@C 阴极的比容量为 84 mA h-g-1，并且具有良好的循环稳定性，循环 100 次后容量保持率为 85%。我们通过原位 X 射线衍射和原位 X 射线光电子能谱研究了电化学反应机理。这项研究加深了我们对 Mg3V4(PO4)6 阴极材料中质子和锌离子存储行为的理解。
Mg3V4(PO4)6: A Potential Cathode Material with High Stability for Aqueous Zinc-Ion Batteries
Aqueous zinc-ion batteries (AZIBs) have wide application prospects in the field of large-scale energy storage systems. The lack of a suitable cathode material is an important factor limiting the development of AZIBs. Polyanionic phosphate Mg3V4(PO4)6 has a stable three-dimensional framework structure and open zinc-ion transmission channels, which are conducive to zinc-ion storage. Here, a carbon-coated Mg3V4(PO4)6@C cathode material is synthesized, and the zinc-ion storage properties are studied for the first time. Benefiting from the open ion transport channels and fast electron transport paths, Mg3V4(PO4)6@C shows a favorable electrochemical performance. The Mg3V4(PO4)6@C cathode delivers a specific capacity of 84 mA h·g–1 at 0.04 A·g–1 and good cycle stability, with a capacity retention of 85% after 100 cycles. The electrochemical reaction mechanism is investigated by ex situ X-ray diffraction and ex situ X-ray photoelectron spectroscopy. This work deepens our understanding of the proton and zinc-ion storage behavior in Mg3V4(PO4)6 cathode materials.
期刊介绍：
ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.
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