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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

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Abstract

A surface-modified O3-type Na[Ni0.6Co0.2Mn0.2]O2 cathode was synthesized by Al2O3 nanoparticle coating using a simple dry ball-milling route. The nanoscale Al2O3 particles (∼15 nm in diameter) densely covering the spherical O3-type Na[Ni0.6Co0.2Mn0.2]O2 cathode particles effectively minimized parasitic reactions with the electrolyte solution while assisting Na+ migration. The proposed Al2O3 coated Na[Ni0.6Co0.2Mn0.2]O2 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 post-mortem 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.

Graphical abstract: 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

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Publication details

The article was received on 24 Sep 2017, accepted on 23 Oct 2017 and first published on 23 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA08443A
Citation: J. Mater. Chem. A, 2017, Advance Article
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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

    J. Hwang, S. Myung, J. U. Choi, C. S. Yoon, H. Yashiro and Y. Sun, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA08443A

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