The development of sodium-ion full cells is seriously suppressed by the incompatibility between elec-trodes and electrolytes.Most representatively,high-voltage ester-based electrolytes required by the cathodes present poor interfacial compatibility with the anodes due to unstable solid electrode inter-phase(SEI).Herein,FeS@N,S-C(spindle-like FeS nanoparticles individually encapsulated in N,S-doped carbon)with excellent structural stability is synthesized as a potential sodium anode material.It exhibits exceptional interfacial stability in ester-based electrolyte(1 M NaClO4 in ethylene carbonate/propylene carbonate with 5％fluoroethylene carbonate)with long-cycling lifespan(294 days)in Na|FeS@N,S-C coin cell and remarkable cyclability in pouch cell(capacity retention of 82.2％after 170 cycles at 0.2 A g-1).DFT calculation reveals that N,S-doping on electrode surface could drive strong repulsion to solvated Na+and preferential adsorption to CIO4 anion,guiding the anion-rich inner Helmholtz plane.Consequently,a robust SEI with rich inorganic species(NaCl and Na2O)through the whole depth stabi-lizes the electrode-electrolyte interface and protects its integrity.This work brings new insight into the role of electrode's surface properties in interfacial compatibility that can guide the design of more versatile electrodes for advanced rechargeable metal-ion batteries.

Jiyu Zhang;Zhen Meng;Dan Yang;Kerning Song;Liwei Mi;Yunpu Zhai;Xinxin Guan;Weihua Chen

College of Chemistry,Zhengzhou University,Zhengzhou 450001,Henan,China;Helmholtz Institute Ulm(HIU)Electrochemical Energy Storage,Ulm D-89081,Germany;Centre of Advanced Materials Research,Zhongyuan University of Technology,Zhengzhou 450007,Henan,China

能源化学

[1]Jiyu Zhang;Zhen Meng;Dan Yang;Kerning Song;Liwei Mi;Yunpu Zhai;Xinxin Guan;Weihua Chen-.Enhanced interfacial compatibility of FeS@N,S-C anode with ester-based electrolyte enables stable sodium-ion full cells)[J].能源化学,2022(05):27-34

representatively,CIO4,lizes

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