期刊
CHEMICAL ENGINEERING JOURNAL
卷 428, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131051
关键词
Metal sulfoselenide; Heterostructure; Carbon nanocomposite; Conversion mechanism; Potassium-ion batteries
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2019R1A2C2088047, 2020R1A4A2002854]
- National Research Foundation of Korea [2020R1A4A2002854] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Potassium-ion batteries show promise as an alternative to lithium-ion batteries, with innovative methods such as introducing hetero-anions into metal compounds to enhance electrochemical kinetics. A new strategy involving embedding metal sulfoselenide solid solution in porous shells of hollow carbon nanospheres has been introduced to create electrode materials with improved stability and conductivity. The conversion reaction mechanism of metal sulfoselenide with potassium ions results in the formation of metal sulfide/metal selenide hetero-interfaces, enabling impressive electrochemical properties for KIBs.
Recently, potassium-ion batteries (KIBs) have been investigated as promising alternative to lithium-ion batteries, and significant advances in terms of new compositions and nanostructures are being made. In this regard, the strategy of introducing hetero-anions into metal compounds has been considered as an innovative method. After the initial electrochemical reaction, hetero-anion metal compounds are divided into individual metal compounds to form heterointerfaces, thus enhancing the electrochemical kinetics. Herein, a new strategy for the synthesis of metal sulfoselenide solid solution embedded in the porous shells of hollow carbon nanospheres is introduced; here, porous hollow carbon nanospheres are utilized as a co-infiltrating matrix to create electrode material with robust stability and high conductivity. The conversion reaction mechanism of metal sulfoselenide with potassium ions was investigated through systematic structural and electrochemical analyses, where metal sulfide/metal selenide hetero-interface was formed after the initial cycle. As anode for KIBs, CoSSe-C exhibited impressive electrochemical properties including particularly long cycle life (286 mA h g-1 for 3000 cycles at 1.5 A g-1) and excellent rate capability (185 mA h g-1 at 5.0 A g-1).
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