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

Wenhua Zuo, Xiangsi Liu, Jimin Qiu, Dexin Zhang, Zhumei Xiao, Jisheng Xie, Fucheng Ren, Jinming Wang, Yixiao Li, Gregorio F. Ortiz, Wen Wen, Shunqing Wu, Ming-Sheng Wang (), Riqiang Fu and Yong Yang ()
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Wenhua Zuo: Xiamen University
Xiangsi Liu: Xiamen University
Jimin Qiu: Peking University Shenzhen Graduate School
Dexin Zhang: Xiamen University
Zhumei Xiao: Xiamen University
Jisheng Xie: Xiamen University
Fucheng Ren: Xiamen University
Jinming Wang: Xiamen University
Yixiao Li: Xiamen University
Gregorio F. Ortiz: University of Córdoba
Wen Wen: Chinese Academy of Sciences
Shunqing Wu: Xiamen University
Ming-Sheng Wang: Xiamen University
Riqiang Fu: National High Magnetic Field Laboratory
Yong Yang: Xiamen University

Nature Communications, 2021, vol. 12, issue 1, 1-11

Abstract: Abstract 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 NaxMnO2 (S-NMO) electrode that is derived from a simple but effective water-mediated strategy. This strategy expands the Na+ layer spacings of P2-type Na0.67MnO2 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.

Date: 2021
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DOI: 10.1038/s41467-021-25074-9

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