Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 124, Issue 3, Pages 1780-1787Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.9b08220
Keywords
-
Funding
- Youth Innovation Promotion Association CAS [2016152]
- University of Chinese Academy of Sciences
- Scientific Instrument Developing Project of the Chinese Academy of Sciences [ZDKYYQ20170001]
Ask authors/readers for more resources
The P2-type layered oxide Na-2/3[Ni1/3Mn2/3]-O-2 cathode material is considered a promising material for sodium-ion batteries because of its high capacity and operating voltage together with a simple synthesis process. However, unfavorable electrochemical performance degradation during cycling is an obstacle to its practical application. Because ZnO has excellent electrical conductivity as a semiconductor material, it was selected for the coating modification study in this experiment. Transmission electron microscopy and energy-dispersive spectroscopy showed a uniform ZnO-coating layer on the surface of the particles with a thickness of 5 nm. When comparing the scanning electron microscope and X-ray diffraction (XRD) results of the electrodes before and after the cycle, we found that ZnO can inhibit the exfoliation phenomenon, and the morphology as well as the structure stability of the electrode were excellently maintained. In addition, according to the XRD refinement, part of Zn2+ entered the transition-metal oxides (TMO2) layer, which improves the stability of the crystal structure. On the basis of the synergistic effect between the ZnO coating and Zn2+ doping, the battery exhibited excellent cycle and rate performance. After 200 cycles at 0.5C (1C = 273 mA g(-1)), the battery still maintained a capacity of 70 mA h g(-1) and a capacity retention rate of 75%. Therefore, we believe that ZnO coating can effectively improve the electrochemical performances of batteries.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available