Electrostatic Regulation of Na⁺ Coordination Chemistry for High-Performance All-Solid-State Sodium Batteries

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Song, Penghui ; Chen, Suli ; Guo, Junhong ; Wu, Junchen ; Lu, Qiongqiong ; Xie, Haijiao ; Wang, Qingsong ; Liu, Tianxi:
Electrostatic Regulation of Na⁺ Coordination Chemistry for High-Performance All-Solid-State Sodium Batteries.
In: Nano-Micro Letters. Bd. 18 (2026) Heft 1 . - 72.
ISSN 2150-5551
DOI: https://doi.org/10.1007/s40820-025-01910-1

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Abstract

An electrostatic engineering strategy is proposed to regulate the Na+ coordinated structure by employing a fluorinated metal–organic framework as an electron-rich model.The abundant electron-rich F sites can accelerate Na-salt disassociation while forcing anions into Na+ coordination structure though electrostatic effect to weaken the Na–O coordination, thus promoting rapid Na+ transport.Anion-rich weak Na+ solvation structure is achieved and contributes to a highly stable inorganic-rich solid–electrolyte interphase, significantly enhances the interfacial stability toward Na anode.Impressively, Na/Na symmetric cell delivered stable Na plating/stripping over 2500 h, and the assembled all-solid-state sodium metal batteries demonstrated stable performance of over 2000 cycles under high rate of 2C with capacity retention nearly 100%.