Birnessite Nanosheet Arrays with High K Content as a High-Capacity and Ultrastable Cathode for K-Ion Batteries

© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 31(2019), 24 vom: 15. Juni, Seite e1900060
1. Verfasser: Lin, Baowei (VerfasserIn)
Weitere Verfasser: Zhu, Xiaohui, Fang, Lingzhe, Liu, Xinyi, Li, Shuang, Zhai, Teng, Xue, Liang, Guo, Qiubo, Xu, Jing, Xia, Hui
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2019
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article birnessite cathode high K content potassium-ion battery ultrahigh stability
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520 |a Potassium-ion batteries (PIBs) are one of the emerging energy-storage technologies due to the low cost of potassium and theoretically high energy density. However, the development of PIBs is hindered by the poor K+ transport kinetics and the structural instability of the cathode materials during K+ intercalation/deintercalation. In this work, birnessite nanosheet arrays with high K content (K0.77 MnO2 ⋅0.23H2 O) are prepared by "hydrothermal potassiation" as a potential cathode for PIBs, demonstrating ultrahigh reversible specific capacity of about 134 mAh g-1 at a current density of 100 mA g-1 , as well as great rate capability (77 mAh g-1 at 1000 mA g-1 ) and superior cycling stability (80.5% capacity retention after 1000 cycles at 1000 mA g-1 ). With the introduction of adequate K+ ions in the interlayer, the K-birnessite exhibits highly stabilized layered structure with highly reversible structure variation upon K+ intercalation/deintercalation. The practical feasibility of the K-birnessite cathode in PIBs is further demonstrated by constructing full cells with a hard-soft composite carbon anode. This study highlights effective K+ -intercalation for birnessite to achieve superior K-storage performance for PIBs, making it a general strategy for developing high-performance cathodes in rechargeable batteries beyond lithium-ion batteries 
650 4 |a Journal Article 
650 4 |a birnessite 
650 4 |a cathode 
650 4 |a high K content 
650 4 |a potassium-ion battery 
650 4 |a ultrahigh stability 
700 1 |a Zhu, Xiaohui  |e verfasserin  |4 aut 
700 1 |a Fang, Lingzhe  |e verfasserin  |4 aut 
700 1 |a Liu, Xinyi  |e verfasserin  |4 aut 
700 1 |a Li, Shuang  |e verfasserin  |4 aut 
700 1 |a Zhai, Teng  |e verfasserin  |4 aut 
700 1 |a Xue, Liang  |e verfasserin  |4 aut 
700 1 |a Guo, Qiubo  |e verfasserin  |4 aut 
700 1 |a Xu, Jing  |e verfasserin  |4 aut 
700 1 |a Xia, Hui  |e verfasserin  |4 aut 
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773 1 8 |g volume:31  |g year:2019  |g number:24  |g day:15  |g month:06  |g pages:e1900060 
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