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How inactive d(0) transition metal controls anionic redox in disordered Li-rich oxyfluoride cathodes
Li, YN; Zhao, XL; Bao, QS; Cui, MN; Qiu, WJ; Liu, JJ
2020-11-01
Source PublicationENERGY STORAGE MATERIALS
ISSN2405-8297
Pages253
SubtypeArticle
AbstractThe disordered Li-rich oxyfluoride cathodes not only offer potentials for high energy density through cooperative cationic and anionic redox but also for facile lithium diffusion by formatting activated percolating channels. Generally, the d(0) transition metals (TM) are considered as an essential facilitator for stabilization of the cation-disordered phase, but no redox activity. Nevertheless, their influence on reversible cationic and anionic redox is not fully understood, and consequently preventing further material design. Here, our studies for typical material Li2Mn1/2Ti1/2O2F unequivocally demonstrate that the local configurations containing redox-inactive d(0) TM make more contribution to reversible capacity than those containing electrochemically active Mn2+. The peculiar effect is attributed to forming low-energy charge-ordering state that d(0) TM prefers staying with Li-O-Li and pushes down O 2p unbonding state into a low-energy level. The present study reveals that a disordered oxyfluoride cathode design achieving a high reversible capacity may necessarily consider a suitable ratio of active low-charge TM to high-charge d(0) TM.
DOI10.1016/j.ensm.2020.07.013
WOS KeywordLITHIUM BATTERIES ; CAPACITY ; OXIDE ; BOTTLENECKS ; STABILITY ; EVOLUTION
Language英语
WOS Research AreaChemistry ; Science & Technology - Other Topics ; Materials Science
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/27640
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Li, YN,Zhao, XL,Bao, QS,et al. How inactive d(0) transition metal controls anionic redox in disordered Li-rich oxyfluoride cathodes[J]. ENERGY STORAGE MATERIALS,2020:253.
APA Li, YN,Zhao, XL,Bao, QS,Cui, MN,Qiu, WJ,&Liu, JJ.(2020).How inactive d(0) transition metal controls anionic redox in disordered Li-rich oxyfluoride cathodes.ENERGY STORAGE MATERIALS,253.
MLA Li, YN,et al."How inactive d(0) transition metal controls anionic redox in disordered Li-rich oxyfluoride cathodes".ENERGY STORAGE MATERIALS (2020):253.
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