All-solid-state sodium batteries (ASSBs) offer an attractive low-cost and high-safety power source for vehicles and stationary power plants beyond of lithium-based batteries. Currently, their application is limited by the rigid solid electrolyte (SE)/electrode contact interface which causes large interfacial resistance and poor cycling stability. Here we reveal a soft perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) as a representative organic cathode material shows good mechanical and electrochemical compatibility with a rigid inorganic Na3Zr2Si2PO12 SE, thus can promote the ASSBs using organic cathodes. Specifically, all-solid-state PTCDA/Na3Zr2Si2PO12/sodium batteries are assembled which show a smaller charge transfer resistance of 310 Ω cm2 at 25 °C than that (460 Ω cm2) of the PTCDA//sodium batteries using a conventional liquid electrolyte. Moreover, the all-solid-state sodium battery delivers an initial capacity of 120.8 mAh g-1, and achieves a retention of 73.4% over 500 cycles at 200 mA g-1, while the liquid battery shows quick capacity decay after the 50th cycles. This work demonstrates an effective strategy by combining a soft cathode with a rigid solid electrolyte to overcome the interfacial issues of ASSBs, and will promote the development of ASSBs using diverse cathodes of low cost, high specific capacity, and long-term reliability.

中文翻译：

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揭示稳定的有机正极/固体电解质界面，促进使用有机阴极的全固态钠电池


全固态钠电池 （ASSB） 为锂基电池以外的车辆和固定发电厂提供了一种有吸引力的低成本和高安全性电源。目前，它们的应用受到刚性固体电解质 （SE）/电极接触界面的限制，导致界面电阻大和循环稳定性差。在这里，我们揭示了一种软苝-3,4,9,10-四羧酸二酐 （PTCDA） 作为代表性的有机正极材料与刚性无机 Na3Zr2Si2PO12 SE 具有良好的机械和电化学相容性，因此可以使用有机正极促进 ASSBs。具体来说，组装了全固态 PTCDA/Na3Zr2Si2PO12/钠电池，在 25 °C 时显示出更小的电荷转移电阻 310 Ω cm2 比使用常规液体电解质的 PTCDA//钠电池 （460 Ω cm2）。此外，全固态钠电池的初始容量为 120.8 mAh g-1，在 200 mA g-1 下，在 500 次循环中可实现 73.4% 的保留率，而液态电池在第 50 次循环后容量迅速衰减。这项工作展示了一种通过将软阴极与刚性固体电解质相结合来克服 ASSB 界面问题的有效策略，并将促进使用低成本、高比容量和长期可靠性的多种阴极的 ASSB 的发展。