期刊
ENERGY STORAGE MATERIALS
卷 27, 期 -, 页码 459-465出版社
ELSEVIER
DOI: 10.1016/j.ensm.2019.12.008
关键词
Silver chalcogenides; Carbon composites; Reaction mechanism; Conversion-type cathodes; Rechargeable magnesium batteries
资金
- Korea Institute of Science and Technology [2E29641]
- National Research Foundation of Korea [NRF2019M3D1A2103932]
- National Research Foundation of Korea [2E30201] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Despite intensive studies for the last several decades, the progress in the development of efficient cathode materials for rechargeable magnesium batteries is slow. In particular, most intercalation-based materials demonstrate lethargic reaction kinetics owing to a large activation barrier for Mg2+ migration. Here, for the first time, we evaluate silver chalcogenides as efficient cathode materials based on a conversion reaction mechanism. Simple one-pot ball milling is employed to produce silver chalcogenide nanoparticles embedded in a carbon matrix, which exhibits excellent electrochemical activity with Mg2+ at room temperature. Particularly, the Ag2Se composite delivers a theoretical magnesium storage capacity of 182 mA h g(-1) at a 0.1-C rate and 79 mA h g(-1) at a 1-C with an adequate stability up to 500 cycles. Structural analyses during cycling confirm that silver chalcogenides operate via a conversion reaction route. This investigation provides an opportunity to develop a new class of viable cathode materials utilizing conversion chemistry.
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