Sodium-ion batteries (SIBs) are amongst the most attractive alternatives for stationary applications and light electromobility due to potentially substantial cost reductions resulting from the availability, wide distribution, and easily accessible nature its constituents. However, commercialization is hindered - especially by lack of high-performance negative electrodes, little development of advanced electrolytes with suitable electrochemical stability windows (ESW) and electrode-electrolyte interphases (EEI), and the necessity of ongoing optimization of the most promising positive electrodes. Sodium layered oxides (SLOs) are considered one of the best positive electrodes for SIBs, due to relatively facile synthesis, flexibility, versatility, high specific capacity and fast structural Na⁺ ion diffusion (which potentially enables work at high current densities). Amongst SLOs, sodium manganese-rich layered oxides (SMRLOs) - with general formula Na_xMn_yTM_1-yO₂ (y ≥ 0.67; where TM = one or more metal/s) - are the most promising candidates in terms of low-cost, environmental friendliness and cyclability. Advances in research have exploited a wide range of investigative approaches and characterization techniques (e.g. solid-state nuclear magnetic resonance (ssNMR), in situ and ex situ Synchrotron XRD (SXRD), ab initio calculations, etc.) and subsequently established a good understanding of the physicochemical properties of SMRLOs, particularly with respect to their effect on electrochemical performance. The goal of this review is, therefore, to highlight and contextualize the most recent improvements relating to SMRLOs, so as to make available a good understanding of the potential challenges facing commercialization. Conclusions regarding strategies for future SIB commercialization, especially the use of SMRLOs as positive electrodes, are proposed.

钠离子电池（SIB）是固定应用和轻型电动汽车最有吸引力的替代产品之一，这是由于其成分的可用性，广泛的分布和易于使用的特性可能会大大降低成本。但是，商品化受到阻碍-特别是由于缺少高性能负极，具有合适的电化学稳定性窗口（ESW）和电极-电解质中间相（EEI）的先进电解质的开发以及对最有希望的正极进行持续优化的必要性。钠层氧化物（SLO）被认为是SIB的最佳正极之一，因为其合成相对较容易，具有灵活性，多功能性，高比容量和快速的结构性Na ⁺离子扩散（有可能在高电流密度下工作）。在SLO中，通式为Na _x Mn _y TM _1-y O ₂（y≥0.67 ；其中TM =一种或多种金属/ s）的富钠锰层状氧化物（SMRLO）是最有前途的候选材料低成本，环境友好和可循环使用。在研究进展已经利用了广泛的调查方法和表征技术（例如，固态核磁共振（SSNMR），就地和异地同步XRD（SXRD），从头计算等），并随后对SMRLO的理化特性，尤其是它们对电化学性能的影响，有了很好的了解。因此，本次审查的目标是突出显示与SMRLO相关的最新改进并将其背景化，以便对商业化面临的潜在挑战有一个很好的了解。提出了有关未来SIB商业化策略的结论，尤其是使用SMRLO作为正极的结论。