Organic cathode materials have gained substantial attention in sodium-ion batteries (SIBs) because of their low cost, structure versatility, and environmental friendliness. Nevertheless, the use of organic materials is plagued by the unsatisfactory cycling performance caused by dissolution of organic electrode materials, use of inappropriate electrolytes, and/or poor interfacial compatibility. In this work, an ultralong cycle life of SIBs through coupling an insoluble organic cathode, N, N′-bis(glycinyl) naphthalene diimide, with ether-based electrolytes, is realized. A thin and stable inorganic-rich solid electrolyte interphase is constructed through a prior reduction of salt in the organic solvents in the ether-based electrolytes, promising fast charge transfer kinetics and stable cycling performance of organic electrodes in SIBs. A superb long cycle life of 70 000 cycles at 10C is demonstrated, which is a new record for organic cathode materials in SIBs. The findings highlight the key role of electrolytes and electrolyte/electrode interfaces in furthering the practical prospects of organic electrodes.

中文翻译：

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用于钠离子电池的醚基电解质实现超长循环寿命有机阴极

有机正极材料因其低成本、结构通用性和环境友好性而在钠离子电池（SIB）中受到广泛关注。然而，有机材料的使用受到有机电极材料溶解、使用不合适的电解质和/或界面相容性差导致循环性能不理想的困扰。在这项工作中，通过将不溶性有机阴极 N, N'-双（甘氨酰）萘二亚胺与醚基电解质结合，实现了 SIBs 的超长循环寿命。通过预先减少醚基电解质中有机溶剂中的盐，构建了薄而稳定的富含无机物的固体电解质中间相，有望实现快速电荷转移动力学和有机电极在 SIB 中的稳定循环性能。展示了在 10C 下 70 000 次循环的超长循环寿命，这是 SIB 中有机正极材料的新记录。研究结果强调了电解质和电解质/电极界面在促进有机电极的实际前景方面的关键作用。