Effect of nickel and iron on structural and electrochemical properties of O3 type layer cathode materials for sodium-ion batteries

Title
Effect of nickel and iron on structural and electrochemical properties of O3 type layer cathode materials for sodium-ion batteries
Author
선양국
Keywords
O3-type; Layered structure; Cathode material; Sodium ion battery; Oxalate
Issue Date
2016-08
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF POWER SOURCES, v. 324, Page. 106-112
Abstract
We investigate that the effect of Ni and Fe contents on structural and electrochemical properties of O3-type layered Na[Ni0.75-xFexMn0.25]O-2 (x = 0.4, 0.45, 0.5, and 0.55) in which Mn is fixed at 25%. As increasing the Ni contents, the capacities are gradually higher while the capacity retention and thermal properties are inferior. When Fe contents are increased, by contrast, the electrode exhibits stable capacity retention and satisfactory thermal stability although the resulting capacity slightly decreases. Structural investigation of post cycled electrodes indicate that lattice variation is greatly suppressed from x = 0.5 in Na[Ni0.75-xFexMn0.25]O-2. This indicates that an appropriate amount of Fe into the Na[Ni0.75-xFexMn0.25]O-2 stabilizes the crystal structure and this leads to the good cycling performances. Also, the better structural stability obtained by Fe addition is responsible for the less heat generation at elevated temperature for the desodiated Na1-delta[Ni0.75-xFexMn0.25]O-2 (x = 0.4, 0.45, 0.5, and 0.55) caused by less evaporation of oxygen from the crystal structure.(C) 2016 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0378775316306103?via%3Dihubhttp://repository.hanyang.ac.kr/handle/20.500.11754/75120
ISSN
0378-7753; 1873-2755
DOI
10.1016/j.jpowsour.2016.05.064
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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