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  Vitalization of P2–Na2/3Ni1/3Mn2/3O2 at high-voltage cyclability via combined structural modulation for sodium-ion batteries

Huang, Y., Yan, Z., Luo, W., Hu, Z., Liu, G., Zhang, L., et al. (2020). Vitalization of P2–Na2/3Ni1/3Mn2/3O2 at high-voltage cyclability via combined structural modulation for sodium-ion batteries. Energy Storage Materials, 29, 182-189. doi:10.1016/j.ensm.2020.04.012.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-6344-E Version Permalink: http://hdl.handle.net/21.11116/0000-0006-6346-C
Genre: Journal Article

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 Creators:
Huang, Yangyang1, Author
Yan, Zichao1, Author
Luo, Wei1, Author
Hu, Zhiwei2, Author              
Liu, Ganxiong1, Author
Zhang, Lulu1, Author
Yang, Xuelin1, Author
Ou, Mingyang1, Author
Liu, Wenjian1, Author
Huang, Liqiang1, Author
Lin, Hongji1, Author
Chen, Chien-Te1, Author
Luo, Jiahuan1, Author
Li, Sa1, Author
Han, Jiantao1, Author
Chou, Shulei1, Author
Huang, Yunhui1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863461              

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Free keywords: High voltage, Mg, P2 phase Ni-Based cathode, Sodium ion batteries, Structure modulation, Ti co-substitution, Cathodes, Metal ions, Modulation, Transition metal compounds, Transition metals, Capacity fading, Cathodic charge, Charge/discharge, Cycling stability, Na-ion batteries, Rate capabilities, Structural modulations, Structural rearrangement, Sodium-ion batteries
 Abstract: P2-type Na2/3Ni1/3Mn2/3O2 (P2-NaNM) is a promising cathode material for practical applications in Na-ion batteries due to its high capacity. However, the rearrangement of Na+/vacancy order and cathodic charge order across the Na extraction/intercalation and structural rearrangements of P2-NaNM at high voltages result in rapid capacity fading and insufficient rate capability. Here, a combined structural modulation strategy was presented to solve these challenges via reducing the Na layers spacing through substituting Na sites by Mg ions while simultaneously stabilizing the transition metal (TM) layers through Mg/Ti co-doping. Benefited from the symbiotic effect, P2-NaNM exhibits a significantly enhanced cycling stability and rate capability in the voltage range of 3.0–4.4 ​V. We further revealed that Mn remains Mn4+ while Ni2+ becomes Ni3+ at the surface of Mg/Ti co-substituted P2-NaNM upon charge/discharge process. © 2020 Elsevier B.V.

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Language(s): eng - English
 Dates: 2020-04-182020-04-18
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1016/j.ensm.2020.04.012
 Degree: -

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Title: Energy Storage Materials
Source Genre: Journal
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Publ. Info: Elsevier
Pages: - Volume / Issue: 29 Sequence Number: - Start / End Page: 182 - 189 Identifier: ISSN: 2405-8297
CoNE: https://pure.mpg.de/cone/journals/resource/2405-8297