Rechargeable sodium-ion batteries (SIBs) have attracted great attention for large-scale electric energy storage applications and smart grid owing to the abundance of Na resources and comparable performance with lithium-ion batteries. The use of organic electrode materials enables a sodium storage system with high energy/power density, metal-free, environmental friendliness, flexibility, lightweight, and cost-effectiveness. More importantly, the structural diversity and the ease of functionalizing organic molecules allows straightforward controllability on the redox properties and thus on the battery performances. Despite the development of organic SIBs is still in its infant state, they have drawn dramatically growing attentions and shown great promises throughout research works. In this review, we summarize the research efforts to push forward the electrochemical performance of the organic SIBs. We explore the efforts made on molecular design and electrode design, and the combination of both forms the basis to regulate the electrochemical properties. Moreover, we summarize the strategies for reducing the solubility of the organic electrode materials in light of the importance of this issue. The crucial differences between organic lithium-ion batteries and organic SIBs are presented. Finally, future challenges and opportunities of further developing organic electrode materials are discussed.

中文翻译：

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用于可充电钠离子电池的有机材料

由于钠资源丰富且性能与锂离子电池相当，可充电钠离子电池（SIBs）在大规模电能存储应用和智能电网中引起了极大的关注。有机电极材料的使用使钠储存系统具有高能量/功率密度、无金属、环保、柔韧性、重量轻和成本效益。更重要的是，结构的多样性和有机分子功能化的简易性使得可以直接控制氧化还原特性，从而控制电池性能。尽管有机 SIB 的开发仍处于起步阶段，但它们已引起越来越多的关注，并在整个研究工作中显示出巨大的希望。在这次审查中，我们总结了推动有机 SIBs 电化学性能的研究工作。我们探索了在分子设计和电极设计方面所做的努力，两者的结合构成了调节电化学性能的基础。此外，鉴于这个问题的重要性，我们总结了降低有机电极材料溶解度的策略。介绍了有机锂离子电池和有机 SIB 之间的关键区别。最后，讨论了进一步开发有机电极材料的未来挑战和机遇。鉴于此问题的重要性，我们总结了降低有机电极材料溶解度的策略。介绍了有机锂离子电池和有机 SIB 之间的关键区别。最后，讨论了进一步开发有机电极材料的未来挑战和机遇。鉴于此问题的重要性，我们总结了降低有机电极材料溶解度的策略。介绍了有机锂离子电池和有机 SIB 之间的关键区别。最后，讨论了进一步开发有机电极材料的未来挑战和机遇。