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Engineering Na(+)-layer spacings to stabilize Mn-based layered cathodes for sodium-ion batteries

Layered transition metal oxides are the most important cathode materials for Li/Na/K ion batteries. Suppressing undesirable phase transformations during charge-discharge processes is a critical and fundamental challenge towards the rational design of high-performance layered oxide cathodes. Here we...

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Detalles Bibliográficos
Autores principales: Zuo, Wenhua, Liu, Xiangsi, Qiu, Jimin, Zhang, Dexin, Xiao, Zhumei, Xie, Jisheng, Ren, Fucheng, Wang, Jinming, Li, Yixiao, Ortiz, Gregorio F., Wen, Wen, Wu, Shunqing, Wang, Ming-Sheng, Fu, Riqiang, Yang, Yong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8360981/
https://www.ncbi.nlm.nih.gov/pubmed/34385435
http://dx.doi.org/10.1038/s41467-021-25074-9
Descripción
Sumario:Layered transition metal oxides are the most important cathode materials for Li/Na/K ion batteries. Suppressing undesirable phase transformations during charge-discharge processes is a critical and fundamental challenge towards the rational design of high-performance layered oxide cathodes. Here we report a shale-like Na(x)MnO(2) (S-NMO) electrode that is derived from a simple but effective water-mediated strategy. This strategy expands the Na(+) layer spacings of P2-type Na(0.67)MnO(2) and transforms the particles into accordion-like morphology. Therefore, the S-NMO electrode exhibits improved Na(+) mobility and near-zero-strain property during charge-discharge processes, which leads to outstanding rate capability (100 mAh g(−1) at the operation time of 6 min) and cycling stability (>3000 cycles). In addition, the water-mediated strategy is feasible to other layered sodium oxides and the obtained S-NMO electrode has an excellent tolerance to humidity. This work demonstrates that engineering the spacings of alkali-metal layer is an effective strategy to stabilize the structure of layered transition metal oxides.