| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 186699 | Electrochimica Acta | 2014 | 8 Pages |
•Zn is employed as dopant in LiNi0.5Mn1.5O4.•The effects of Zn doping on structure and performance are investigated.•LiZn0.08Ni0.42Mn1.5O4 shows excellent rate capability and cyclic performance.•The mechanism of performance improvement by Zn doping is examined.
The effects of Zn substitution for Ni on the crystal structure and electrochemical properties of LiZnxNi0.5-xMn1.5O4 (x = 0 − 0.5) are investigated. The LiZnxNi0.5-xMn1.5O4 samples, which were synthesized by a sol-gel method, were analyzed by X-ray diffraction (XRD), Raman spectroscopy, field-emission scanning electron microscopy (FE-SEM), battery cycling test, cyclic voltammetry (CV), and X-ray photoelectron spectroscopy (XPS). Of the compositions investigated, the LiZn0.08Ni0.42Mn1.5O4 delivered improved cycle-life and C-rate performance even at elevated temperature compared with those of Zn-free LiNi0.5Mn1.5O4. XRD and XPS results show that a thick positive electrode/electrolyte interphase film is formed on the surface of the x = 0.08 electrode, which may prevent the continuous electrolyte oxidation during cycling.
