Статья

Sn Anodes Protected by Intermetallic FeSn<sub>2</sub> Layers for Long‐lifespan Sodium‐ion Batteries with High Initial Coulombic Efficiency of 93.8 %

Ming ChenShanghai Electrochemical Energy Devices Research Center School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 P. R. ChinaPing XiaoNational and Local Collaborative Engineering Center of Chinese Medicinal Resources Industrialization and Formulae Innovative Medicine Nanjing University of Chinese Medicine Nanjing 210023 ChinaKe YangShanghai Electrochemical Energy Devices Research Center School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 P. R. ChinaBoxu DongShanghai Electrochemical Energy Devices Research Center School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 P. R. ChinaDong XuShanghai Electrochemical Energy Devices Research Center School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 P. R. ChinaChangyu YanShanghai Electrochemical Energy Devices Research Center School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 P. R. ChinaXuejiao LiuShanghai Electrochemical Energy Devices Research Center School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 P. R. ChinaJiantao ZaiShanghai Electrochemical Energy Devices Research Center School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 P. R. ChinaCheeTong John LowWarwick Electrochemical Engineering Group WMG Energy Innovation Centre University of Warwick Warwick CV4 7AL UKXuefeng QianShanghai Electrochemical Energy Devices Research Center School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 P. R. China

2023en

ABI

Аннотация

Abstract With a theoretical capacity of 847 mAh g −1 , Sn has emerged as promising anode material for sodium‐ion batteries (SIBs). However, enormous volume expansion and agglomeration of nano Sn lead to low Coulombic efficiency and poor cycling stability. Herein, an intermetallic FeSn 2 layer is designed via thermal reduction of polymer‐Fe 2 O 3 coated hollow SnO 2 spheres to construct a yolk‐shell structured Sn/FeSn 2 @C. The FeSn 2 layer can relieve internal stress, avoid the agglomeration of Sn to accelerate the Na + transport, and enable fast electronic conduction, which endows quick electrochemical dynamics and long‐term stability. As a result, the Sn/FeSn 2 @C anode exhibits high initial Coulombic efficiency (ICE=93.8 %) and a high reversible capacity of 409 mAh g −1 at 1 A g −1 after 1500 cycles, corresponding to an 80 % capacity retention. In addition, NVP//Sn/FeSn 2 @C sodium‐ion full cell shows outstanding cycle stability (capacity retaining rate of 89.7 % after 200 cycles at 1 C).

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Идентификаторы

DOI: 10.1002/anie.202219177

Цитирования и источники

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