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• W4386508035 abstract "Reversible three-electron redox of Cr3+ /Cr6+ in layered cathode materials for rechargeable batteries is very attractive in layered cathode materials, which leads to high capacity and energy density for rechargeable batteries. However, the poor reversibility and Cr-ion migration make it very challenging. In this work, by introducing V ions into tetrahedral sites of layer-structured NaCrO2 , reversible three-electron redox of Cr3+ /Cr6+ is realized successfully in NaCr0.92 V0.05 O2 (NCV05) cathode for potassium-ion batteries with a cut-off voltage of 4.0 V. V ions can weaken the attraction of Cr to electrons, leading to enhanced valence change of Cr ions. On the other hand, V in tetrahedral sites can facilitate the reversible migration of Cr between octahedral and tetrahedral sites via coulombic repulsion to realize the reversible redox between Cr3+ and Cr6+ during charge and discharge processes. In addition, V ions can inhibit the phase transition from O3 phase to O'3 phase during the charge process by adjusting the crystal lattices. As a result, the NaCr0.92 V0.05 O2 cathode exhibits a high reversible capacity of 130 mAh g-1 with promising cycle stability and rate capability. The strategy opens new opportunity for developing high-capacity cathode materials for potassium-ion batteries." @default.
• W4386508035 created "2023-09-08" @default.
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• W4386508035 date "2023-09-07" @default.
• W4386508035 modified "2023-10-01" @default.
• W4386508035 title "Tetrahedral Occupied V Ions Enabling Reversible Three‐Electron Redox of Cr³⁺/Cr⁶⁺ in Layered Cathode Materials for Potassium‐Ion Batteries" @default.
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• W4386508035 doi "https://doi.org/10.1002/smll.202304945" @default.
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• W4386508035 hasPublicationYear "2023" @default.
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