NaBr-Assisted Sintering of Na3Zr2Si2PO12 Ceramic Electrolyte Stabilizes a Rechargeable Solid-state Sodium Metal Battery,ACS Applied Materials & Interfaces

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NaBr-Assisted Sintering of Na3Zr2Si2PO12 Ceramic Electrolyte Stabilizes a Rechargeable Solid-state Sodium Metal Battery
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-10-17 , DOI: 10.1021/acsami.3c13483
Yang Li _{1,

2} , Zheng Sun ₁ , Xuanyi Yuan ₃ , Haibo Jin ₁ , Yongjie Zhao _{1,

2}

Affiliation

Solid-state metal batteries with nonflammable solid-state electrolytes are regarded as the next generation of energy storage technology on account of their high safety and energy density. However, as for most solid electrolytes, low room temperature ionic conductivity and interfacial issues hinder their practical application. In this work, Na super ionic conductor (NASICON)-type Na₃Zr₂Si₂PO₁₂ (NZSP) electrolytes with improved ionic conductivity are synthesized by the NaBr-assisted sintering method. The effects of the NaBr sintering aid on the crystalline phase, microstructure, densification degree, and electrical performance as well as the electrochemical performances of the NZSP ceramic electrolyte are investigated in detail. Specifically, the NZSP-7%NaBr-1150 ceramic electrolyte has an ionic conductivity of 1.2 × 10^–3 S cm^–1 (at 25 °C) together with an activation energy of 0.28 eV. A low interfacial resistance of 35 Ω cm² is achieved with the Na/NZSP-7%NaBr-1150 interface. Furthermore, the Na/NZSP-7%NaBr-1150/Na₃V₂(PO₄)₃ battery manifests excellent cycling stability with a capacity retention of 98% after 400 cycles at 1 C and 25 °C.

中文翻译：

Na3Zr2Si2PO12 陶瓷电解质的 NaBr 辅助烧结可稳定可充电固态钠金属电池

具有不可燃固态电解质的固态金属电池因其高安全性和能量密度而被视为下一代储能技术。然而，对于大多数固体电解质来说，较低的室温离子电导率和界面问题阻碍了它们的实际应用。在这项工作中，通过NaBr辅助烧结方法合成了具有改进离子电导率的Na超离子导体（NASICON）型Na ₃ Zr ₂ Si ₂ PO _{12 （NZSP）电解质。}详细研究了NaBr烧结助剂对NZSP陶瓷电解质的晶相、微观结构、致密化程度、电性能以及电化学性能的影响。具体而言，NZSP-7%NaBr-1150陶瓷电解质的离子电导率为1.2 × 10 –3 ^S cm ^–1（25 °C），活化能为0.28 eV。Na/NZSP-7%NaBr-1150 界面可实现35 Ω cm ²的低界面电阻。此外，Na/NZSP-7%NaBr-1150/Na ₃ V ₂ (PO ₄ ) ₃电池表现出优异的循环稳定性，在1 C和25 °C下循环400次后容量保持率为98%。

更新日期：2023-10-17

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