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SeC Bonding Promoting Fast and Durable Na + Storage in Yolk–Shell SnSe 2 @SeC
Author(s) -
Xiao Shuhao,
Li Zhenzhe,
Liu Jintao,
Song Yushan,
Li Tingshuai,
Xiang Yong,
Chen Jun Song,
Yan Qingyu
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202002486
Subject(s) - anode , materials science , selenide , carbon fibers , chemical engineering , tin , battery (electricity) , phase (matter) , lithium (medication) , electrode , ion , shell (structure) , doping , sodium ion battery , nanotechnology , composite material , selenium , chemistry , metallurgy , organic chemistry , optoelectronics , composite number , thermodynamics , medicine , power (physics) , physics , faraday efficiency , engineering , endocrinology
Tin‐based compounds have received much attention as anode materials for lithium/sodium ion batteries owing to their high theoretical capacity. However, the huge volume change usually leads to the pulverization of electrode, giving rise to a poor cycle performance, which have severely hampered their practical application. Herein, highly durable yolk–shell SnSe 2 nanospheres (SnSe 2 @SeC) are prepared by a multistep templating method, with an in situ gas‐phase selenization of the SnO 2 @C hollow nanospheres. During this process, Se can be doped into the carbon shell with a tunable amount and form SeC bonds. Density functional theory calculation results reveal that the SeC bonding can enhance the charge transfer properties as well as the binding interaction between the SnSe 2 core and the carbon shell, favoring an improved rate performance and a superior cyclability. As expected, the sample delivers reversible capacities of 441 and 406 mAh g −1 after 2000 cycles at 2 and 5 A g −1 , respectively, as the anode material for a sodium‐ion battery. Such performances are significantly better than the control sample without the SeC bonding and also other metal selenide‐based anodes, evidently showing the advantage of Se doping in the carbon shell.