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231225s2020 xx |||||o 00| ||eng c |
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|a 10.1002/adma.202001944
|2 doi
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|a pubmed24n1041.xml
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|a (DE-627)NLM312335679
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|a (NLM)32656860
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|a DE-627
|b ger
|c DE-627
|e rakwb
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| 041 |
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|a eng
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| 100 |
1 |
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|a Hwang, Jaeseong
|e verfasserin
|4 aut
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| 245 |
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|a Excess-Li Localization Triggers Chemical Irreversibility in Li- and Mn-Rich Layered Oxides
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|c 2020
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Revised 30.09.2020
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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|a Li- and Mn-rich layered oxides (LMRs) have emerged as practically feasible cathode materials for high-energy-density Li-ion batteries due to their extra anionic redox behavior and market competitiveness. However, sluggish kinetics regions (<3.5 V vs Li/Li+ ) associated with anionic redox chemistry engender LMRs with chemical irreversibility (first-cycle irreversibility, poor rate properties, voltage fading), which limits their practical use. Herein, the structural origin of this chemical irreversibility is revealed through a comparative study involving Li1.15 Mn0.51 Co0.17 Ni0.17 O2 with relatively localized and delocalized excess-Li in its lattice system. Operando fine-interval X-ray absorption spectroscopy is used to simultaneously observe the interplay between transition-metal-oxygen (TM-O) redox chemistry and TM migration behavior in real time. Density functional theory calculations show that excess-Li localization in the LMR structure attenuates TM-O covalency and stability, leading to overall chemical irreversibility. Hence, the delocalized excess-Li system is proposed as an alternative design for practically feasible LMR cathodes with restrained TM migration and sustainable O-redox chemistry
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|a Journal Article
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|a Li- and Mn-rich layered oxide
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|a chemical irreversibility
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|a excess-Li localization
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|a lithium-ion batteries
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|a oxygen stability
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|a Myeong, Seungjun
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Jin, Wooyoung
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Jang, Haeseong
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Nam, Gyutae
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Yoon, Moonsu
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Kim, Su Hwan
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Joo, Se Hun
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Kwak, Sang Kyu
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Kim, Min Gyu
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Cho, Jaephil
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g 32(2020), 34 vom: 05. Aug., Seite e2001944
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnns
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| 773 |
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|g volume:32
|g year:2020
|g number:34
|g day:05
|g month:08
|g pages:e2001944
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|u http://dx.doi.org/10.1002/adma.202001944
|3 Volltext
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