Phase-separated bimetal enhanced sodium storage:Dimer-like Sn-Bi@C heterostructures with high capacity and long cycle life  

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作  者:Xiaoxiao Hou Yansong Zhu Qian Yao Jinmei Song Chunsheng Wang Yanli Zhou Suyuan Zeng Jian Yang Yitai Qian 

机构地区:[1]Key Laboratory of Colloid and Interface Chemistry,Ministry of Education,School of Chemistry and Chemical Engineering,Shandong University,Jinan 250100,Shandong,China [2]Department of Environmental and Material Engineering,Yantai University,Yantai 264005,Shandong,China [3]Department of Chemistry and Chemical Engineering,Liaocheng University,Liaocheng 252059,Shandong,China [4]Hefei National Laboratory for Physical Science at Microscale,Department of Chemistry,University of Science and Technology of China,Hefei 230026,Anhui,China

出  处:《Journal of Energy Chemistry》2023年第4期468-476,共9页能源化学(英文版)

基  金:the financial support from Outstanding Youth Scholarship in Shandong University and the Nature Science Foundation of Shandong Province(No.ZR2021MB109)。

摘  要:Phase boundaries facilitate the charge transportation and alleviate the intrinsic stress upon cycles.Therefore,how to achieve regular phase boundaries is very attractive.Herein,dimer-like Sn-Bi@C nanostructures,where is a well-defined phase boundary between Sn and Bi,have been prepared by a two-step process for the first time.The phase boundary not only provides additional and fast transportation for Na+,but also mitigates the structure stress/strain upon cycling.Therefore,Sn-Bi@C exhibits a high capacity(472.1 m A h g^(-1)at 2 A g^(-1)for 200 cycles),an ultra-long cyclic life(355.6 mA h g^(-1)at 5 A g^(-1)for 4500cycles)and an excellent rate performance(372 mA h g^(-1)at 10 A g^(-1))for sodium storage,much higher than those of Sn@C,Bi@C,and Sn@C+Bi@C.Notably,the full cells of Sn-Bi@C//Na_(3)V_(2)(PO_(4))_(3)/rGO(SnBi@C//NVP/rGO)demonstrate impressive performance(323 mA h g^(-1)at 2 A g^(-1)for 300 cycles).The underlying mechanism for such an excellent performance is elucidated by in-situ X-ray diffraction,exsitu scanning electron microscopy/high-resolution transmission electron microscopy and atomic force microscopy,revealing the good electrode stability and improved mechanical properties of Sn-Bi@C.The synthetic method is extended to dimer-like Sn-Pb@C and Sn-Ag@C heterostructures,which also exhibit the good cycle stability for sodium storage.

关 键 词:Bi Sn Alloy-type anodes Sodium-ion batteries Phase boundaries 

分 类 号:TM912[电气工程—电力电子与电力传动]

 

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