Controlled Oxygen Redox for Excellent Power Capability in Layered Sodium-Based Compounds

Hee Jae Kim, Aishuak Konarov, Jae Hyeon Jo, Ji Ung Choi, Kyuwook Ihm, Han Koo Lee, Jongsoon Kim, Seung Taek Myung

Research output: Contribution to journalArticle

Abstract

A high-rate of oxygen redox assisted by cobalt in layered sodium-based compounds is achieved. The rationally designed Na0.6[Mg0.2Mn0.6Co0.2]O2 exhibits outstanding electrode performance, delivering a discharge capacity of 214 mAh g−1 (26 mA g−1) with capacity retention of 87% after 100 cycles. High rate performance is also achieved at 7C (1.82 A g−1) with a capacity of 107 mAh g−1. Surprisingly, the Na0.6[Mg0.2Mn0.6Co0.2]O2 compound is able to deliver capacity for 1000 cycles at 5C (at 1.3 A g−1), retaining 72% of its initial capacity of 108 mAh g−1. X-ray absorption spectroscopy analysis of the O K-edge indicates the oxygen-redox species (O2−/1−) is active during cycling. First-principles calculations show that the addition of Co reduces the bandgap energy from ≈2.65 to ≈0.61 eV and that overlapping of the Co 3d and O 2p orbitals facilitates facile electron transfer, enabling the long-term reversibility of the oxygen redox, even at high rates. To the best of the authors' knowledge, this is the first report on high-rate oxygen redox in sodium-based cathode materials, and it is believed that the findings will open a new pathway for the use of oxygen-redox-based materials for sodium-ion batteries.

Original languageEnglish
Article number1901181
JournalAdvanced Energy Materials
Volume9
Issue number32
DOIs
Publication statusPublished - Jan 1 2019
Externally publishedYes

Fingerprint

Sodium
Oxygen
X ray absorption spectroscopy
Cobalt
Energy gap
Cathodes
Oxidation-Reduction
Ions
Electrodes
Electrons

Keywords

  • DFT
  • Mn-rich
  • oxygen redox
  • P2-type layered cathodes
  • sodium-ion batteries

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Controlled Oxygen Redox for Excellent Power Capability in Layered Sodium-Based Compounds. / Kim, Hee Jae; Konarov, Aishuak; Jo, Jae Hyeon; Choi, Ji Ung; Ihm, Kyuwook; Lee, Han Koo; Kim, Jongsoon; Myung, Seung Taek.

In: Advanced Energy Materials, Vol. 9, No. 32, 1901181, 01.01.2019.

Research output: Contribution to journalArticle

Kim, Hee Jae ; Konarov, Aishuak ; Jo, Jae Hyeon ; Choi, Ji Ung ; Ihm, Kyuwook ; Lee, Han Koo ; Kim, Jongsoon ; Myung, Seung Taek. / Controlled Oxygen Redox for Excellent Power Capability in Layered Sodium-Based Compounds. In: Advanced Energy Materials. 2019 ; Vol. 9, No. 32.
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AB - A high-rate of oxygen redox assisted by cobalt in layered sodium-based compounds is achieved. The rationally designed Na0.6[Mg0.2Mn0.6Co0.2]O2 exhibits outstanding electrode performance, delivering a discharge capacity of 214 mAh g−1 (26 mA g−1) with capacity retention of 87% after 100 cycles. High rate performance is also achieved at 7C (1.82 A g−1) with a capacity of 107 mAh g−1. Surprisingly, the Na0.6[Mg0.2Mn0.6Co0.2]O2 compound is able to deliver capacity for 1000 cycles at 5C (at 1.3 A g−1), retaining 72% of its initial capacity of 108 mAh g−1. X-ray absorption spectroscopy analysis of the O K-edge indicates the oxygen-redox species (O2−/1−) is active during cycling. First-principles calculations show that the addition of Co reduces the bandgap energy from ≈2.65 to ≈0.61 eV and that overlapping of the Co 3d and O 2p orbitals facilitates facile electron transfer, enabling the long-term reversibility of the oxygen redox, even at high rates. To the best of the authors' knowledge, this is the first report on high-rate oxygen redox in sodium-based cathode materials, and it is believed that the findings will open a new pathway for the use of oxygen-redox-based materials for sodium-ion batteries.

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