Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 35, Issue 6, Pages 994-1002Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2018.12.021
Keywords
Li-rich cathode oxide material; Oxygen vacancy; Solvothermal method; Electrochemical performance
Funding
- National Key Research and Development Program [2017YFA0402800]
- National Natural Science Foundation of China [U1732160, 11504380]
Ask authors/readers for more resources
A couple of layered Li-rich cathode materials Li1.2Mn0.54Ni0.13Co0.13O2 without any carbon modification are successfully synthesized by solvothermal and hydrothermal methods followed by a calcinationprocess. The sample synthesized by the solvothermal method (S-NCM) possesses more homogenous microstructure, lower cation mixing degree and more oxygen vacancies on the surface, compared to thesample prepared by the hydrothermal method (H-NCM). The S-NCM sample exhibits much better cycling performance, higher discharge capacity and more excellent rate performance than H-NCM. At 0.2 C rate, the S-NCM sample delivers a much higher initial discharge capacity of 292.3 mAh g(-1) and the capacity maintains 235 mAh g(-1) after 150 cycles (80.4% retention), whereas the corresponding capacity values are only 269.2 and 108.5 mAh g(-1) (40.3% retention) for the H-NCM sample. The S-NCM sample also shows the higher rate performance with discharge capacity of 118.3 mAh g(-1) even at a high rate of 10 C, superior to that (46.5 mAh g(-1)) of the H-NCM sample. The superior electrochemical performance of the S-NCM sample can be ascribed to its well-ordered structure, much larger specific surface area and much more oxygen vacancies located on the surface. (c) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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