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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
Nature communications, 08/2021, Volume: 12, Issue: 1Journal Article
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 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.
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