Cathode Interface Regulation in Solid-state Sodium Batteries Based on Sodium Oxychloride

doi:10.15541/jim20260319

Abstract

Abstract: Na₃Zr₂Si₂PO₁₂ (NZSP), featuring a unique three-dimensional open-framework structure, exhibits high room-temperature ionic conductivity, a wide electrochemical stability window, and excellent chemical stability, making it one of the most promising solid electrolytes for solid-state sodium-ion batteries. However, poor interfacial contact and high interfacial resistance between NZSP and cathode materials remain critical challenges. In this work, an amorphous sodium oxychloride, Na-Ta-Cl-O (NTCO), was prepared by mechanical ball milling and employed as an interfacial modification layer between NZSP and the cathode to improve interfacial Na⁺ transport kinetics and electrochemical performance. The results show that NTCO forms a uniform and continuous ion-conducting interface between NZSP and Na₃V₂(PO₄)₃ (NVP), effectively improving interfacial contact and facilitating rapid Na⁺ transport. After NTCO modification, the polarization resistance (Rp) decreased from 2475 Ω·cm² to 1038 Ω·cm². At a rate of 0.5C, the assembled solid-state cell exhibited a capacity retention of 81.2% after 100 cycles. These results demonstrate that sodium oxychloride can serve as an effective interfacial modification material for the NZSP/NVP interface, significantly reducing interfacial resistance and enhancing interfacial stability.

Key words: Na-Ta-Cl-O, Na₃Zr₂Si₂PO₁₂, interfacial engineering, solid-state sodium-ion battery, Na⁺ transport

CLC Number:

TM911

SUN Chang, JIA Yaya, HAN Xiangyu, ZHANG Xiaoyan, LI Gaomeng, LIU Bing, ZHU Guohua, LIU Shan. Cathode Interface Regulation in Solid-state Sodium Batteries Based on Sodium Oxychloride[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20260319.

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