Abstract
Na-ion batteries possess great potential applications in the large-scale energy storage. The Na-ion layered oxide cathode (Na<sub><i>x</i></sub>TMO<sub>2</sub>) has received increasing attention in scientific and industrial research due to its high capacity, easy manufacture, adjustable voltage, and low cost. However, the larger the Na<sup>+</sup> radius and the stronger the Na<sup>+</sup>-Na<sup>+</sup> electrostatic repulsion is, which will lead to various structural configurations and complex structural transitions, resulting in multiple structure-property connections. In this paper, the structural types of Na-ion layered transition metal oxide cathode materials are introduced, and their structural evolutions during Na<sup>+</sup> de/intercalation are summarized for revealing the mechanism for structural transformation of Na-ion layered transition-metal oxide cathode material and its effect on electrochemical performance; the existing challenges are discussed; the improvement strategies are proposed finally.
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