Na3V2O2(PO4)2F3-2 as a stable positive electrode for potassium-ion batteries
نویسندگان
چکیده
Reversible potassium ion insertion into Na3V2O2x(PO4)2F3-2x, which is regarded as a solid solution between Na3V3+2(PO4)2F3 and Na3V4+2O2(PO4)2F demonstrated for the first time. V3+/V4+-mixed Na3V2O2x (PO4)2F3-2x-multiwalled carbon nanotube (MWCNT) composite was prepared by conventional hydrothermal reaction. Na3V2O2x(PO4)2F3-2x-MWCNT exhibiting an average electrode potential of 3.7 V in cell due to cumulative inductive effect phosphate fluoride oxide. The delivers initial discharge capacity 118 mAh g−1 at 0.1C (13 mA g−1) rate with good cycle stability high-rate capability performances. electrochemical measurements, energy dispersive X-ray analysis, ex-situ, operando diffractions provide new insights reversible phase transformations during subsequent cycles after K/Na exchange process cycle.
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ژورنال
عنوان ژورنال: Journal of Power Sources
سال: 2021
ISSN: ['1873-2755', '0378-7753']
DOI: https://doi.org/10.1016/j.jpowsour.2021.229676