气候变化领域集成服务门户(CCPortal): Crystal water for high performance layered manganese oxide cathodes in aqueous rechargeable zinc batteries

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DOI	10.1039/c9ee00718k
	Crystal water for high performance layered manganese oxide cathodes in aqueous rechargeable zinc batteries
	Nam K.W.; Kim H.; Choi J.H.; Choi J.W.
发表日期	2019
ISSN	17545692
起始页码	1999
结束页码	2009
卷号	12 期号:6
英文摘要	Aqueous zinc (Zn)-ion batteries are gaining considerable attention as grid-scale energy storage systems due to their advantages in rate performance, cost, and safety. Here, we report a layered manganese oxide that contains a high content of crystal water (∼10 wt%) as an aqueous zinc battery cathode. The interlayer crystal water can effectively screen the electrostatic interactions between Zn2+ ions and the host framework to facilitate Zn2+ diffusion while sustaining the host framework for prolonged cycles. By virtue of these 'water' effects, this material exhibits a high reversible capacity of 350 mA h g-1 at 100 mA g-1, along with decent cycling and rate performance, in a two-electrode cell configuration. Density functional theory (DFT) calculations and extended X-ray absorption fine structure (EXAFS) analyses jointly reveal that upon Zn2+ ion intercalation, a stable inner-sphere Zn-complex coordinated with water molecules is formed, followed by the formation of a Zn-Mn dumbbell structure, which gives a clue for the observed electrochemical performance. This work unveils the useful function of crystal water in enhancing the key electrochemical performance of emerging divalent battery electrodes. © 2019 The Royal Society of Chemistry.
英文关键词	Binary alloys; Cathodes; Coordination reactions; Density functional theory; Electrochemical electrodes; Extended X ray absorption fine structure spectroscopy; Ions; Manganese alloys; Manganese oxide; Manganese removal (water treatment); Molecules; Oxides; Secondary batteries; Water absorption; X ray absorption; Zinc alloys; Battery electrode; Electrochemical performance; Energy storage systems; Extended x-ray absorption fine structure analysis; High reversible capacities; Ion intercalation; Layered manganese oxide; Two electrode cells; Zinc compounds; aqueous solution; crystal structure; electrode; fuel cell; manganese oxide; performance assessment; zinc
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189883
作者单位	Graduate School of Energy, Environment, Water, and Sustainability, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu Daejeon, 34141, South Korea; Electron Microscopy Research Center, Korea Basic Science Institute, 169-148 Gwahak-ro, Yuseong-gu Daejeon, 34133, South Korea; KEPCO Research Institute, Korea Electric Power Corporation, 105 Munji-ro, Yuseong-gu Daejeon, 34056, South Korea; School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, 1 Gwanak-ro, Gwanak-gu Seoul, 08826, South Korea
推荐引用方式 GB/T 7714	Nam K.W.,Kim H.,Choi J.H.,et al. Crystal water for high performance layered manganese oxide cathodes in aqueous rechargeable zinc batteries[J],2019,12(6).
APA	Nam K.W.,Kim H.,Choi J.H.,&Choi J.W..(2019).Crystal water for high performance layered manganese oxide cathodes in aqueous rechargeable zinc batteries.Energy & Environmental Science,12(6).
MLA	Nam K.W.,et al."Crystal water for high performance layered manganese oxide cathodes in aqueous rechargeable zinc batteries".Energy & Environmental Science 12.6(2019).