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Mg-doped Na[Ni1/3Fe1/3Mn1/3]O-2 with enhanced cycle stability as a cathode material for sodium-ion batteries

Title
Mg-doped Na[Ni1/3Fe1/3Mn1/3]O-2 with enhanced cycle stability as a cathode material for sodium-ion batteries
Author
임원빈
Keywords
Sodium-ion battery; Cathode; Layered oxide; Mg doping; Electrochemistry
Issue Date
2020-06
Publisher
ELSEVIER
Citation
SOLID STATE SCIENCES, v. 106, article no. 106334
Abstract
O3-type Na[Ni1/3Fe1/3Mn1/3]O-2 (NaNFM) is considered as a promising cathode material for sodium-ion batteries; however, its poor cycling stability is still a concern. In this study, we discuss the structural, surface and electrochemical properties of Mg-doped NaMgx[Ni1/3Fe1/3Mn1/3](1-x)O-2 materials and their enhanced cycling performance. The variations of the lattice parameters by substitution of Mg ion and its uniform distribution on the particles are confirmed using X-ray diffraction and transmission electron microscopy. The optimized NaMg0.05[Ni1/3Fe1/3Mn1/3](0.95)O-2 delivers a discharge capacity of similar to 120 mAh g(-1) and has a diffusion coefficient of Na ranging from 6.5 x 10(-13) to 2.7 x 10(-10) cm(2) s(-1). In particular, it shows a relatively high discharge capacity of 42 mAh g(-1) even at a high current density of 1200 mA g(-1) and exhibits considerably enhanced cycling stability (77% capacity retention after 50 cycles), compared with that of the undoped NaNFM (40%). Based on structural and electrochemical analyses, it is suggested that Mg doping can effectively suppress the irreversible structural degradation and induce more reversible phase transitions; this results in a more stable cycling performance of the Mg-doped NaNFM than that of undoped NaNFM.
URI
https://www.sciencedirect.com/science/article/pii/S1293255820304349?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/167330
ISSN
1293-2558; 1873-3085
DOI
10.1016/j.solidstatesciences.2020.106334
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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