Rationally designed hierarchical structures and heteroatomic doping of carbon are effective strategies to enhance the stability and electrical conductivity of materials.Herein,SnSe2 flakes were generated in the double-walled hollow carbon spheres(DWHCSs),in which N and Se atoms were doped in the carbon walls,to construct SnSe2@N,Se-DWHCSs by confined growth and in-situ derivatization.The N and Se-doped DWHCSs can effectively limit the size increase of SnSe2,promote ion diffusion kinetics,and buffer volume expansion,which can be proved by electron microscope observation and density functional the-ory calculation.Consequently,the SnSe2@N,Se-DWHCSs as an anode material for sodium ion batteries(SIBs)demonstrated a distinguished reversible capacity of 322.8 mAh g-1 at 5 A g-1 after 1000 cycles and a superior rate ability of 235.3 mAh g-1 at an ultrahigh rate of 15 A g-1.Furthermore,the structure evolution and electrochemical reaction processes of SnSe2@N,Se-DWHCSs in SIBs were analyzed by ex-situ methods,which confirmed the consecutive hybrid mechanism and the phase transition process.

Xiaoyu Wu;Zhenshan Yang;Lin Xu;JianHua Wang;Lele Fan;Fanjie Kong;Qiaofang Shi;Yuanzhe Piao;Guowang Diao;Ming Chen

School of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou 225002,Jiangsu,China;Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province,Yancheng Institute of Technology,Yancheng 224051,Jiangsu,China;Department of Physics,Yancheng Institute of Technology,Yancheng 224051,Jiangsu,China;Graduate School of Convergence Science and Technology,Seoul National University,145 Gwanggyo-ro,Yeongtong-gu,Suwon-si 16229,Gyeonggi-do,Republic of Korea;Advanced Institutes of Convergence Technology,145 Gwanggyo-ro,Yeongtong-gu,Suwon-si,Gyeonggi-do,16229,Republic of Korea

能源化学

[1]Xiaoyu Wu;Zhenshan Yang;Lin Xu;JianHua Wang;Lele Fan;Fanjie Kong;Qiaofang Shi;Yuanzhe Piao;Guowang Diao;Ming Chen-.Consecutive hybrid mechanism boosting Na+ storage performance of dual-confined SnSe2 in N,Se-doping double-walled hollow carbon spheres)[J].能源化学,2022(11):8-17

heteroatomic,DWHCSs

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