Achieving Ultra-Stable All-Solid-State Sodium Metal Batteries with Anion-Trapping 3D Fiber Network Enhanced Polymer Electrolyte

Junhong Guo; Fan Feng; Shiqiang Zhao; Rui Wang; Meng Yang; Zhenhai Shi; Yufeng Ren; Zifeng Ma; Suli Chen; Tianxi Liu

doi:10.1002/smll.202206740

Achieving Ultra-Stable All-Solid-State Sodium Metal Batteries with Anion-Trapping 3D Fiber Network Enhanced Polymer Electrolyte

Small. 2023 Apr;19(16):e2206740. doi: 10.1002/smll.202206740. Epub 2023 Jan 20.

Authors

Junhong Guo¹, Fan Feng², Shiqiang Zhao³, Rui Wang¹, Meng Yang¹, Zhenhai Shi¹, Yufeng Ren¹, Zifeng Ma², Suli Chen¹, Tianxi Liu¹

Affiliations

¹ The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, International Joint Research Laboratory for Nano Energy Composites, Jiangnan University, Wuxi, 214122, P. R. China.
² Shanghai Electrochemical Energy Devices Research Center, Department of Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China.
³ College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, P. R. China.

PMID: 36670093
DOI: 10.1002/smll.202206740

Abstract

All-solid-state sodium metal batteries paired with solid polymer electrolytes (SPEs) are considered a promising candidate for high energy-density, low-cost, and high-safety energy storage systems. However, the low ionic conductivity and inferior interfacial stability with Na metal anode of SPEs severely hinder their practical applications. Herein, an anion-trapping 3D fiber network enhanced polymer electrolyte (ATFPE) is developed by infusing poly(ethylene oxide) matrix into an electrostatic spun fiber framework loading with an orderly arranged metal-organic framework (MOF). The 3D continuous channel provides a fast Na⁺ transport path leading to high ionic conductivity, and simultaneously the rich coordinated unsaturated cation sites exposed on MOF can effectively trap anions, thus regulating Na⁺ concentration distribution for constructing stable electrolyte/Na anode interface. Based on such advantages, the ATFPE exhibits high ionic conductivity and considerable Na⁺ transference number, as well as enhanced interfacial stability. Consequently, Na/Na symmetric cells using this ATFPE possess cyclability over 600 h at 0.1 mA cm^-2 without discernable Na dendrites. Cooperated with Na₃ V₂ (PO₄ )₃ cathode, the all-solid-state sodium metal batteries (ASSMBs) demonstrate significantly improved rate and cycle performances, delivering a high discharge capacity of 117.5 mAh g^-1 under 0.1 C and rendering high capacity retention of 78.2% after 1000 cycles even at 1 C.

Keywords: Na + conductivity; all-solid-state sodium metal batteries; anion-trapping; interface stability; solid polymer electrolytes.

Abstract

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