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Inhibition of oxygen dimerization by local symmetry tuning in Li-rich layered oxides for improved stability

Li-rich layered oxide cathode materials show high capacities in lithium-ion batteries owing to the contribution of the oxygen redox reaction. However, structural accommodation of this reaction usually results in O–O dimerization, leading to oxygen release and poor electrochemical performance. In thi...

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Detalles Bibliográficos
Autores principales: Ning, Fanghua, Li, Biao, Song, Jin, Zuo, Yuxuan, Shang, Huaifang, Zhao, Zimeng, Yu, Zhen, Chu, Wangsheng, Zhang, Kun, Feng, Guang, Wang, Xiayan, Xia, Dingguo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7532436/
https://www.ncbi.nlm.nih.gov/pubmed/33009376
http://dx.doi.org/10.1038/s41467-020-18423-7
Descripción
Sumario:Li-rich layered oxide cathode materials show high capacities in lithium-ion batteries owing to the contribution of the oxygen redox reaction. However, structural accommodation of this reaction usually results in O–O dimerization, leading to oxygen release and poor electrochemical performance. In this study, we propose a new structural response mechanism inhibiting O–O dimerization for the oxygen redox reaction by tuning the local symmetry around the oxygen ions. Compared with regular Li(2)RuO(3), the structural response of the as-prepared local-symmetry-tuned Li(2)RuO(3) to the oxygen redox reaction involves the telescopic O–Ru–O configuration rather than O–O dimerization, which inhibits oxygen release, enabling significantly enhanced cycling stability and negligible voltage decay. This discovery of the new structural response mechanism for the oxygen redox reaction will provide a new scope for the strategy of enhancing the anionic redox stability, paving unexplored pathways toward further development of high capacity Li-rich layered oxides.