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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
Authors
Jung, Kyu-NamChoi, Jae-YongShin, Hyun-SeopHuu, Ha TranIm, Won BinLee, Jong-Won
DGIST Authors
Lee, Jong-Won
Issue Date
2020-08
Citation
Solid State Sciences, 106, 106334
Type
Article
Article Type
Article
Author Keywords
Sodium-ion batteryCathodeLayered oxideMg dopingElectrochemistry
Keywords
HYBRID STRUCTURESRATE PERFORMANCEELECTRODEO3-TYPEPHASESUBSTITUTION
ISSN
1293-2558
Abstract
O3-type Na[Ni1/3Fe1/3Mn1/3]O2 (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–xO2 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]0.95O2 delivers a discharge capacity of ~120 mAh g−1 and has a diffusion coefficient of Na ranging from 6.5 × 10−13 to 2.7 × 10−10 cm2 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. © 2020 Elsevier Masson SAS
URI
http://hdl.handle.net/20.500.11750/12801
DOI
10.1016/j.solidstatesciences.2020.106334
Publisher
Elsevier Masson SAS
Related Researcher
  • Author Lee, Jong-Won Laboratory for Electrochemical Energy Materials and Interfaces
  • Research Interests 이차전지, 연료전지, 재료전기화학, 나노에너지소재
Files:
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Collection:
Department of Energy Science and EngineeringLaboratory for Electrochemical Energy Materials and Interfaces1. Journal Articles


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