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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\u2013shell SnSe<jats:sub>2<\/jats:sub> nanospheres (SnSe<jats:sub>2<\/jats:sub>@Se\uf8ffC) are prepared by a multistep templating method, with an in situ gas\u2010phase selenization of the SnO<jats:sub>2<\/jats:sub>@C hollow nanospheres. During this process, Se can be doped into the carbon shell with a tunable amount and form Se\uf8ffC bonds. Density functional theory calculation results reveal that the Se\uf8ffC bonding can enhance the charge transfer properties as well as the binding interaction between the SnSe<jats:sub>2<\/jats:sub> 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<jats:sup>\u22121<\/jats:sup> after 2000 cycles at 2 and 5 A g<jats:sup>\u22121<\/jats:sup>, respectively, as the anode material for a sodium\u2010ion battery. Such performances are significantly better than the control sample without the Se\uf8ffC bonding and also other metal selenide\u2010based anodes, evidently showing the advantage of Se doping in the carbon shell.<\/jats:p>","DOI":"10.1002\/smll.202002486","type":"journal-article","created":{"date-parts":[[2020,9,23]],"date-time":"2020-09-23T05:38:12Z","timestamp":1600839492000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":148,"title":["Se\uf8ffC Bonding Promoting Fast and Durable Na<sup>+<\/sup> Storage in Yolk\u2013Shell SnSe<sub>2<\/sub>@Se\uf8ffC"],"prefix":"10.1002","volume":"16","author":[{"given":"Shuhao","family":"Xiao","sequence":"first","affiliation":[{"name":"School of Materials and Energy University of Electronic Science and Technology of China  Chengdu 610054 China"},{"name":"Center for Applied Chemistry University of Electronic Science and Technology of China  No. 2006, Xiyuan Ave. West Hi\u2010Tech Zone Chengdu 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