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The Sodium Storage Mechanism in Tunnel-Type Na0.44MnO2 Cathodes and the Way to Ensure Their Durable Operation

Title
The Sodium Storage Mechanism in Tunnel-Type Na0.44MnO2 Cathodes and the Way to Ensure Their Durable Operation
Authors
Chae, Munseok S.Kim, Hyojeong J.Bu, HyeriLyoo, JeyneAttias, RanDlugatch, BenOliel, MatanGofer, YosefHong, Seung-TaeAurbach, Doron
DGIST Authors
Hong, Seung-Tae
Issue Date
2020-06
Citation
Advanced Energy Materials, 10(21), 2000564
Type
Article
Article Type
Article
Author Keywords
cathode surface filmselectrolyte solutions additivessodium intercalationsodium-ion batteriestunnel-type sodium manganese oxide
Keywords
ION BATTERYLITHIUM BATTERIESELECTRODEINTERCALATIONCHALLENGESNAXMNO2ANODEOXIDELI
ISSN
1614-6832
Abstract
Tunnel-type sodium manganese oxide is a promising cathode material for aqueous/nonaqueous sodium-ion batteries, however its storage mechanism is not fully understood, in part due to the complicated sodium intercalation process. In addition, low cyclability due to manganese dissolution has limited its practical application in rechargeable batteries. Here, the intricate sodium intercalation mechanism of Na0.44MnO2 is revealed by combination of electrochemical characterization, structure determination from powder X-ray diffraction data, 3D bond valence difference maps, and barrier-energy calculations of the sodium diffusion. NaI is proposed as an important electrolyte solution additive. It is shown to form a thin, beneficial, and durable cathode surface film that prevents manganese dissolution. The addition of 0.01 m NaI to electrolyte solutions based on alkyl carbonate solvents and NaClO4 greatly improves the cycling efficiency, raising the capacity retention from 86% to 96% after 600 cycles. This study determines the core aspects of the sodium intercalation mechanism in tunnel-type sodium manganese oxide and shows how it can serve as a durable cathode material for rechargeable Na batteries. © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
URI
http://hdl.handle.net/20.500.11750/12037
DOI
10.1002/aenm.202000564
Publisher
Wiley-VCH Verlag
Related Researcher
  • Author Hong, Seung-Tae Battery Materials Discovery Laboratory
  • Research Interests Magnesium, calcium, and zinc ion batteries; lithium all-solid-state batteries, New inorganic materials discovery; Solid state chemistry; Crystallography; Mg, Ca, Zn 이온 이차전지; 리튬 전고체전지; 신 무기재료 합성; 고체화학; 결정화학
Files:
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Collection:
Department of Energy Science and EngineeringBattery Materials Discovery Laboratory1. Journal Articles


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