Oxygen-Regulated Spontaneous Solid Electrolyte Interphase Enabling Ultra-Stable Solid-State Na Metal Batteries

Keshuang Cao, Yufan Xia, Haosheng Li, Huiqin Huang, Sikandar Iqbal, Muhammad Yousaf, Ben Bin Xu, Wenping Sun, Mi Yan, Hongge Pan, Yinzhu Jiang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Solid-state sodium metal batteries utilizing inorganic solid electrolytes (SEs) hold immense potentials such as intrinsical safety, high energy density, and environmental sustainability. However, the interfacial inhomogeneity/instability at the anode-SE interface usually triggers the penetration of sodium dendrites into the electrolyte, leading to short circuit and battery failure. Herein, confronting with the original nonuniform and high-resistance solid electrolyte interphase (SEI) at the Na-Na3Zr2Si2PO12 interface, an oxygen-regulated SEI innovative approach is proposed to enhance the cycling stability of anode-SEs interface, through a spontaneous reaction between the metallic sodium (containing trace amounts of oxygen) and the Na3Zr2Si2PO12 SE. The oxygen-regulated spontaneous SEI is thin, uniform, and kinetically stable to facilitate homogenous interfacial Na+ transportation. Benefitting from the optimized SEI, the assembled symmetric cell exhibits an ultra-stable sodium plating/stripping cycle for over 6600 h under a practical capacity of 3 mAh cm¬−¬2. Quasi-solid-state batteries with Na3V2(PO4)3 cathode deliver excellent cyclability over 500 cycles at a rate of 0.5 C with a high capacity retention of 95.4%. This oxygen-regulated SEI strategy may offer a potential avenue for the future development of high-energy-density solid-state metal batteries.
Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalScience Bulletin
Early online date7 Nov 2023
Publication statusE-pub ahead of print - 7 Nov 2023

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