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
- Authors
- Hwang, Jang-Yeon; Myung, Seung-Taek; Choi, Ji Ung; Yoon, Chong Seung; Yashiro, Hitoshi; Sun, Yang-Kook
- Issue Date
- Dec-2017
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY A, v.5, no.45, pp.23671 - 23680
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY A
- Volume
- 5
- Number
- 45
- Start Page
- 23671
- End Page
- 23680
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/5331
- DOI
- 10.1039/c7ta08443a
- ISSN
- 2050-7488
- 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.
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