Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8019912 | Materials Letters | 2014 | 4 Pages |
Abstract
Ni-rich layered LiNi0.8Co0.15Al0.05O2 is coated with amorphous FePO4 in an ethanol-based colloidal solution. X-ray diffraction (XRD) measurements indicate that the coated sample is pure hexagonal phase without any crystalline FePO4 in it. Additionally, the lattice parameters a and c are not influenced by the coating layer. The morphologies of the samples are characterized by scanning electron microscope (SEM) analysis. Compared with the pristine sample, the FePO4-coated one shows no change on morphology. However, an amorphous FePO4 coating layer can be observed through transmission electron microscope (TEM) analysis. Moreover, energy dispersive spectrometer (EDS) elemental mappings results confirm that the FePO4 uniformly coats on the host material. By electrochemical characterizations, it is proved that the capacity retention of the FePO4-coated sample is much higher than that of the pristine one. After 100 charge-discharge cycles at 2Â C rate, the pristine and FePO4-coated samples exhibit the capacity retentions of 70.7% and 88.3%, respectively. Furthermore, the impedance increasing during charge-discharge cycles is slowed down by the FePO4 coating layer.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Bin Huang, Xinhai Li, Zhixing Wang, Huajun Guo,