Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 21, Pages 8009-8016Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta00868e
Keywords
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Funding
- National Nature Science Foundation of China [21301193, 51304077]
- Fundamental Research Funds for the Central Universities of Central South University
- Hunan Provincial Natural Science Foundation of China [14JJ3022, 13JJ4100]
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Poor cycling stability and rate capability are the main challenges for LiV3O8 as the cathode material for Li-ion batteries. Here a novel strategy involving the self-transformation of superficial LiV3O8 in a reducing atmosphere (H-2-Ar) was reported to fabricate LixV2O5/LiV3O8 nanoflakes. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and high resolution transmission electron microscopy (HRTEM) results demonstrate that LixV2O5/LiV3O8 nanoflakes could be in situ formed and that the thickness of the LixV2O5 layer is controllable. When used as a cathode for a Li-ion battery, the LixV2O5/LiV3O8 nanoflakes exhibit significantly improved cycling stability with a capacity retention of ca. 82% over 420 cycles at a 1 C-rate (1 C = 300 mA g(-1)), and much better rate performance compared with bare LiV3O8. The improvement of the electrochemical performance could be attributed to the unique core-shell structure, in which the ultrathin LixV2O5 layer could not only protect the internal LiV3O8 from dissolution, but also increase the Li ion diffusion coefficient and suppress the charge-transfer resistance, as verified by electrochemical impedance spectroscopy (EIS) and XRD results.
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