Rational design of layered oxide materials for sodium-ion batteries

By Chenglong Zhao, Qidi Wang, Zhenpeng Yao, Jianlin Wang, Benjamín Sánchez-Lengeling, Feixiang Ding, Xingguo Qi, Yaxiang Lu, X. Bai, Baohua Li and 7 more. Science, 2020

1,123 citations recorded by the source corpus.

Layering the charge Layered metal oxides such as lithium cobalt oxide have attracted great attention for rechargeable batteries. In lithium cells, only the octahedral structure forms, but in sodium cells, trigonal prismatic structures are also possible. However, there is a lack of understanding about how to predict and control the formation of each structure. Zhao et al. used the simple properties of ions, namely their charge and their radius appropriately weighted by stoichiometry, to determine whether sodium in the interlayers between the transition metal or other ion-oxide layers remain octahedral rather than switching over to trigonal prismatic coordination. Science, this issue p. 708 The energy storage properties of layered oxides are characterized and optimized for cathodes in sodium ion batteries. Sodium-ion batteries have captured widespread attention for grid-scale energy storage owing to the natural abundance of sodium. The performance of such batteries is limited by available electrode materials, especially for sodium-ion layered oxides, motivating the exploration of high compositional diversity. How the composition determines the structural chemistry is decisive for the electrochemical performance but very challenging to predict, especially for complex compositions. We introduce the “cationic potential” that captures the key interactions of layered materials and makes it possible to predict the stacking structures. This is demonstrated through the rational design and preparation of layered electrode materials with improved performance. As the stacking structure determines the functional properties, this methodology offers a solution toward the design of alkali metal layered oxides.

Subfields: Automotive Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/e1b292d85e0deaf45c1a10c9d6f2fa076e939756

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Citations in the corpus

2021 roadmap for sodium-ion batteries (2021, background): “As a baseline electrolyte, this study used commercially available NP30 (1 M NaPF6 in EC:DMC 50:50), a direct analogue to the LP30 electrolyte, and standard 18 650 cells and protocols.”