화학공학소재연구정보센터
Journal of Power Sources, Vol.264, 123-127, 2014
A novel lithium vanadium fluorophosphate nanosheet with uniform carbon coating as a cathode material for lithium-ion batteries
Lithium vanadium fluorophosphate (LiVPO4F/C) nanosheets with uniform carbon coating are successfully synthesized using a hydrothermal method followed by calcination. X-ray diffraction results reveal that the obtained products crystallized in the triclinic LiVPO4F phase. Scanning electron microscope and transmission electron microscope images demonstrate that both vanadium phosphate (VPO4/C) and LiVPO4F/C composites have a very flat sheet-like morphology, with each nanosheet exhibiting a smooth surface and a typical thickness of 50-100 nm. The nanosheets are coated by a uniform layer of amorphous carbon. Electrochemical tests show that LiVPO4F nanosheets deliver a discharge capacity of 143 mAh g(-1) at 0.1 C in the range of 3.0-4.5 Vat the first cycle and possess a favorable capacity at rates of 0.5, 1, 2, 3 and 5 C. (C) 2014 Elsevier B.V. All rights reserved.