Journal
RARE METALS
Volume 31, Issue 2, Pages 140-144Publisher
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-012-0479-6
Keywords
lithium ion batteries; LiNi1/3Co1/3Mn1/3O2; Cr2O3 coating
Funding
- National Key Project for Basic Research of China [2005CB623605]
- National Natural Science Foundation of China [11074039]
- National Science Foundation for Young Scholars [11004032]
Ask authors/readers for more resources
Cr2O3-coated LiNi1/3Co1/3Mn1/3O2 cathode materials were synthesized by a novel method. The structure and electrochemical properties of prepared cathode materials were measured using X-ray diffraction (XRD), scanning electron microscopy (SEM), charge-discharge tests, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The measured results indicate that surface coating with 1.0 wt% Cr2O3 does not affect the LiNi1/3Co1/3Mn1/3O2 crystal structure (alpha-NaFeO2) of the cathode material compared to the pristine material, the surfaces of LiNi1/3Co1/3Mn1/3O2 samples are covered with Cr2O3 well, and the LiNi1/3Co1/3Mn1/3O2 material coated with Cr2O3 has better electrochemical performance under a high cutoff voltage of 4.5 V. Moreover, at room temperature, the initial discharging capacity of LiNi1/3Co1/3Mn1/3O2 material coated with 1.0 wt.% Cr2O3 at 0.5C reaches 169 mAh center dot g(-1) and the capacity retention is 83.1% after 30 cycles, while that of the bare LiNi1/3Co1/3Mn1/3O2 is only 160.8 mAh center dot g(-1) and 72.5%. Finally, the coated samples are found to display the improved electrochemical performance, which is mainly attributed to the suppression of the charge-transfer resistance at the interface between the cathode and the electrolyte.
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