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- W2977770192 abstract "The voltage and capacity of cathodes are critical factors for energy density of batteries. However, the cutoff voltage of cathode materials in potassium‐ion batteries (PIBs) is usually 4.0 V, causing structural transformations in the electrode materials in the course of repeated insertion/extraction of K + ions with a large radius (1.38 Å). Materials with large interlayer spacing and short ion diffusion paths show promise to overcome this issue. K 0.486 V 2 O 5 nanobelts, prepared by preinserting K + ions into V 2 O 5 , are used as cathode materials in high‐voltage PIBs. Various analysis methods are used to understand the insertion/extraction behavior of K + ions in K 0.486 V 2 O 5 cathodes cycled between 1.5 and 4.2 V. The analyses reveal the highly reversible structural evolution of K 0.486 V 2 O 5 , in which the chemically inserted K + ions partially remain between VO layers charged at high voltage serving as stabilizing species to prevent phase transformations. K 0.486 V 2 O 5 cathodes exhibit a high specific capacity of 159 mAh g −1 at 20 mA g −1 with good cycling stability of 67.4% after 100 cycles at 100 mAh g −1 in the half K‐ion cell. The results provide guidelines for designing layered transition metal oxides to be used as cathode materials for high‐voltage PIBs with high energy density." @default.
- W2977770192 created "2019-10-10" @default.
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- W2977770192 date "2019-10-23" @default.
- W2977770192 modified "2023-10-17" @default.
- W2977770192 title "Prepotassiated V<sub>2</sub>O<sub>5</sub> as the Cathode Material for High‐Voltage Potassium‐Ion Batteries" @default.
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- W2977770192 doi "https://doi.org/10.1002/ente.201900796" @default.
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