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Resolving the degradation pathways of the O3-type layered oxide cathode surface through the nano-scale aluminum oxide coating for high-energy density sodium-ion batteries

Title
Resolving the degradation pathways of the O3-type layered oxide cathode surface through the nano-scale aluminum oxide coating for high-energy density sodium-ion batteries
Author
윤종승
Keywords
ELECTROCHEMICAL PERFORMANCE; STORAGE MATERIAL; ANODE MATERIAL; HARD-CARBON; ELECTRODE; LICOO2; TEMPERATURE; STABILITY; INSERTION; CELLS
Issue Date
2017-12
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v. 5, no. 45, page. 23671-23680
Abstract
A surface-modified O3-type Na[Ni0.6Co0.2Mn0.2]O-2 cathode was synthesized by Al2O3 nanoparticle coating using a simple dry ball-milling route. The nanoscale Al2O3 particles (similar to 15 nm in diameter) densely covering the spherical O3-type Na[Ni0.6Co0.2Mn0.2]O-2 cathode particles effectively minimized parasitic reactions with the electrolyte solution while assisting Na+ migration. The proposed Al2O3 coated Na [Ni0.6Co0.2Mn0.2]O-2 cathode exhibited a high specific capacity of 151 mA h g(-1), as well as improved cycling stability and rate capability in a half cell. Furthermore, the Al2O3 coated cathode was scaled up to a pouch-type full cell using a hard carbon anode that exhibited a superior rate capability and capacity retention of 75% after 300 cycles with a high energy density of 130 W h kg(-1). In addition, the postmortem surface characterization of the cathodes from the long-term cycled full cells helped in identifying the exact mechanism of the surface reaction with the electrolyte and the reason for its subsequent degradation and showed that the nano-scale Al2O3 coating layer was effective at resolving the degradation pathways of the cathode surface from hydrogen fluoride (HF) attack.
URI
https://pubs.rsc.org/en/content/articlelanding/2017/TA/C7TA08443A#!divAbstracthttp://repository.hanyang.ac.kr/handle/20.500.11754/116732
ISSN
2050-7488; 2050-7496
DOI
10.1039/c7ta08443a
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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