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231225s2022 xx |||||o 00| ||eng c |
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|a 10.1002/adma.202105404
|2 doi
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|a pubmed25n1116.xml
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|a (DE-627)NLM33497819X
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|a (NLM)34961966
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|a DE-627
|b ger
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|a eng
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|a Huang, Yangyang
|e verfasserin
|4 aut
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| 245 |
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|a Enabling Anionic Redox Stability of P2-Na5/6 Li1/4 Mn3/4 O2 by Mg Substitution
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|c 2022
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Revised 03.03.2022
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2022 Wiley-VCH GmbH.
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|a Oxygen-based anionic redox reactions have recently emerged as a lever to increase the capacity of Mn-rich layered oxide cathodes in addition to the charge compensation based on cationic redox reactions for sodium-ion batteries. Unfortunately, the irreversibility of anionic redox often aggravates irreversible structure change and poor cycling performance. Here, a stable anionic redox is achieved through substituting Na ions by Mg ions in P2-type Na0.83 Li0.25 Mn0.75 O2 . Density functional theory (DFT) calculations reveal that Mg substitution effectively decreases the oxygen chemical potential, causing an improvement in lattice oxygen stability. Moreover, at a highly desodiated state, Mg ions that remain in the lattice and interact with O 2p orbitals can decrease the undercoordinated oxygen and the nonbonded, electron-deficient O 2p states, facilitating the reversibility of oxygen redox. When cycled in the voltage range of 2.6-4.5 V where only anionic redox occurs for charge compensation, Na0.773 Mg0.03 Li0.25 Mn0.75 O2 presents a much better reversibility, giving a 4 times better cycle stability than that of Na0.83 Li0.25 Mn0.75 O2 . Experimentally, Na0.773 Mg0.03 Li0.25 Mn0.75 O2 exhibits a ≈1.1% volume expansion during sodium insertion/extraction, suggestive of a "zero-strain" cathode. Overall, the work opens a new avenue for enhancing anionic reversibility of oxygen-related Mn-rich cathodes
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|a Journal Article
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|a Mg incorporation
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|a Mn-rich cathodes
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|a anionic redox reactions
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|a sodium-ion batteries
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|a zero-strain
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1 |
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|a Zhu, Yongcheng
|e verfasserin
|4 aut
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1 |
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|a Nie, Anmin
|e verfasserin
|4 aut
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1 |
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|a Fu, Haoyu
|e verfasserin
|4 aut
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1 |
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|a Hu, Zhiwei
|e verfasserin
|4 aut
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1 |
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|a Sun, Xueping
|e verfasserin
|4 aut
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1 |
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|a Haw, Shu-Chih
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Chen, Jin-Ming
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Chan, Ting-Shan
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Yu, Sijie
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Sun, Guang
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Jiang, Gang
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Han, Jiantao
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Luo, Wei
|e verfasserin
|4 aut
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| 700 |
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|a Huang, Yunhui
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g 34(2022), 9 vom: 01. März, Seite e2105404
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnas
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| 773 |
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|g volume:34
|g year:2022
|g number:9
|g day:01
|g month:03
|g pages:e2105404
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| 856 |
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|u http://dx.doi.org/10.1002/adma.202105404
|3 Volltext
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