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journal article·2024-01-12Open access

Migration of Mg in Na–O–Mg Configuration for Oxygen Redox of Sodium Cathode

Jun Ho Yu, Natalia Voronina, Najma Yaqoob, Sungkyu Kim, Anil Kumar Paidi, Docheon Ahn, Kyuwook Ihm, Keun Hwa Chae, Min-Gi Jeong, Hun-Gi Jung, Olivier Guillon, Payam Kaghazchi, Seung-Taek Myung

ACS Energy Letters· Volume 9· Issue 1
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Source abstract

Abstract

The effect of the 4d Ru element in P2-Na 0.6 [Mg 0.2 Ru 0.2 Mn 0.6 ]O 2 is investigated. Ru-free Na 0.6 [Mg 0.2 Mn 0.8 ]O 2 is activated with Mn 3+ /Mn 4+ redox, after which the charge is compensated by the sluggish oxidation of lattice oxygen (O 2– ) to O 2 n – triggered by the evolution of the O 2 from the oxide lattice. These effects are generally unfavorable and result in poor long-term cycle stability induced by the irreversible migration of Mg 2+ from the transition metal (TM) to Na layers in the P2 structural framework. Benefiting from the covalent Ru bonded with O in the TM layers, the Mg migration reversibly progresses from the TM to sodium slabs without the evolution of the O 2 in the structure. The associated reaction progresses via the active Mn 4+ /Mn 3+ and O 2– /(O 2 ) n − reaction in addition to the Ru 5+ /Ru 4+ /Ru 3+ redox pairs, enabling a capacity increase (∼210 mAh g –1 ), with ∼72.1% retention for 300 cycles.
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Research context

Energy storage

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Supercapacitor Materials and Fabrication

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Hybrid Materials Research Center, Department of Nano Technology and Advanced Materials Engineering, Sejong Battery Institute, Sejong University, Seoul 05006, South Korea

Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Materials Synthesis and Processing (IEK-1), Jülich 52428, Germany

MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands

Pohang Accelerator Laboratory, 80 Jigokro-127-beongil, Nam-gu, Pohang, Gyeongbuk 37673, South Korea

Center for Energy Storage Research, Korea Institute of Science and Technology, Seoul 02792, South Korea

KIST-SKKU Carbon-Neutral Research Center, Sungkyunkwan University, Suwon 16419, South Korea

Department of Energy Science, Sungkyunkwan University, Suwon 16419, South Korea

Funding

Bundesministerium f?r Bildung und Forschung · National Research Foundation of Korea · Ministry of Trade, Industry and Energy

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