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- W3042321331 abstract "Potassium vanadium fluorophosphate (KVPO 4 F) is one of the most promising cathode candidates for K-ion batteries because of its high specific capacity, voltage, and energy density. However, reducing its capacity fade remains an important challenge. This work leverages structure and electrochemical analysis to understand the capacity degradation mechanism of the KVPO 4 F cathode. Interestingly, no structural degradation of the KVPO 4 F cathode is detected after 200 cycles in the wide voltage window of 5.0–2.5 V (vs K/K + ). Instead, the capacity degradation is attributed to electrolyte decomposition at high voltage (>4.5 V vs K/K + ), which causes drying of the electrolyte and the formation of insulating layers on the cathode surface, significantly increasing the polarization. The properties of four KPF 6 - and carbonate-based K electrolytes are compared, and 0.7 M KPF 6 in ethylene carbonate/propylene carbonate exhibits the highest oxidation stability and results in the best cycling stability for the KVPO 4 cathode. These findings suggest that the key to improving the cycling stability of KVPO 4 F is to develop novel K electrolytes with even higher oxidation stability." @default.
- W3042321331 created "2020-07-23" @default.
- W3042321331 creator A5014983956 @default.
- W3042321331 creator A5047484082 @default.
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- W3042321331 date "2020-01-08" @default.
- W3042321331 modified "2023-10-13" @default.
- W3042321331 title "Origin of Capacity Degradation of High-Voltage KVPO<sub>4</sub>F Cathode" @default.
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- W3042321331 doi "https://doi.org/10.1149/1945-7111/aba54e" @default.
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