Tin selenide(SnSe)is considered as a potential anode for sodium-ion batteries(SIBs)owing to its high theoretical specific capacity.Unfortunately,it suffers from drastic volume expansion/contraction during sodium ions insertion/extraction,resulting in poor cycling stability.Herein,a pomegranate-inspired por-ous carbon shell wrapped heterogeneous SnSe/ZnSe composite(SnSe/ZnSe@C)is exquisitely designed and fabricated through electrostatic spraying followed by high-temperature selenization.The polyacrylonitrile-derived carbon shell acts as an adhesive to link the porous cubic SnSe/ZnSe and form highly interconnected microcircuits to improve the electron/ion transfer efficiency and inhibit the bulk volume change of internal metallic selenide nanoparticles and polyselenides dissolution during repeated cycling.Moreover,the abundant heterostructure interface of SnSe/ZnSe further significantly accelerates the electrons/ions transport.As a result,the as-prepared SnSe/ZnSe@C electrode exhibits a high specific capacity(508.3 mAh g-1 at 0.05 A g-1),excellent rate performance(177.8 mAh g-1 at 10.0 A g-1),and remarkable cycling stability(195.9 mAh g-1 after 10,000 cycles at 5.0 A g-1).Furthermore,in-situ X-ray diffraction(XRD)/Raman,ex-situ transmission electron microscopy,and kinetic analysis clearly reveal a four-step electrochemical reaction process and battery-capacitor dual-mode sodium storage mecha-nism.This work provides a new perspective for developing commercial SIBs anode materials with high capacity and long lifespan.

Zhixin Liang;Qinghua Li;Wang Zhang;Dandan Yu;Wei Zhang;Jiawei Wu;Gaoyu Wang;Wenbo Fan;Junling Wang;Shaoming Huang

School of Materials and Energy,Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices,Guangdong University of Technology,Guangzhou 510006,Guangdong,China;College of Materials Science and Engineering,Shenzhen University,Shenzhen 518055,Guangdong,China;College of Materials and Chemistry,China Jiliang University,Hangzhou 310018,Zhejiang,China

能源化学

[1]Zhixin Liang;Qinghua Li;Wang Zhang;Dandan Yu;Wei Zhang;Jiawei Wu;Gaoyu Wang;Wenbo Fan;Junling Wang;Shaoming Huang-.Pomegranate-inspired porous SnSe/ZnSe@C anode:A stress-buffer nanostructure for fast and ultrastable sodium-ion storage)[J].能源化学,2022(12):369-377

microcircuits,polyselenides

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