A novel lithium vanadium fluorophosphate nanosheet with uniform carbon coating as a cathode material for lithium-ion batteries

作者：Zhang, Bao; Han, Ya-dong; Zheng, Jun-chao^*; Shen, Chao; Ming, Lei; Zhang, Jia-feng

来源：Journal of Power Sources, 2014, 264: 123-127.

DOI：10.1016/j.jpowsour.2014.04.087

• Lithium-ion battery
• Cathode material
• Lithium vanadium fluorophosphates
• Nanosheet
• Electrochemical performance

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.

• 出版日期2014-10-15
• 单位中南大学