Effects of Al sub(2)O sub(3) and AlF sub(3) coating on the electrochemical performance of Li sub(3)V sub(2)(PO sub(4)) sub(3)/C cathode material in lithium ion batteries

Surface modified Li sub(3)V sub(2)(PO sub(4)) sub(3)/C materials have been prepared by coating with AlF sub(3) and Al sub(2)O sub(3) via a conventional precipitation method. X-ray diffraction patterns indicate that the surface modification does not affect to the bulk structure of Li sub(3)V sub(2)(P...

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Veröffentlicht in:Solid state ionics 2015-12, Vol.283, p.131-136
Hauptverfasser: Oh, Rye-Gyeong, Hong, Jung-Eui, Yang, Won-Geun, Ryu, Kwang-Sun
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Sprache:eng
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Zusammenfassung:Surface modified Li sub(3)V sub(2)(PO sub(4)) sub(3)/C materials have been prepared by coating with AlF sub(3) and Al sub(2)O sub(3) via a conventional precipitation method. X-ray diffraction patterns indicate that the surface modification does not affect to the bulk structure of Li sub(3)V sub(2)(PO sub(4)) sub(3). Field emission scanning electron microscopy and field emission transmission electron microscopy show that an amorphous carbon layer and particles of AlF sub(3) and Al sub(2)O sub(3) are coated on the surface of Li sub(3)V sub(2)(PO sub(4)) sub(3) particles. Both AlF sub(3)- and Al sub(2)O sub(3)-coated materials exhibit better cycling performance than the uncoated Li sub(3)V sub(2)(PO sub(4)) sub(3)/C between 3.0 and 4.8 V. The capacity retention rates of LVP/C, LVP/C-AlF sub(3), and LVP/C-Al sub(2)O sub(3) after 50 cycles at 0.2 C are 76.12, 85.39, and 84.99%, respectively.
ISSN:0167-2738
DOI:10.1016/j.ssi.2015.10.004