Achieving highly stable Sn-based anode by a stiff encapsulation heterostructure

作     者：Ruizhe Li Jijian Xu Zhuoran Lv Wujie Dong Fuqiang Huang 李睿哲;徐吉健;吕卓然;董武杰;黄富强

作者机构：State Key Laboratory of High Performance Ceramics and Superfine MincrostructureShanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese of Academy of SciencesBeijing 100049China State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China 

出 版 物：《Science China Materials》 (中国科学（材料科学（英文版）)

年 卷 期：2022年第65卷第3期

页      面：695-703页

核心收录：

学科分类：081702[工学-化学工艺] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by China Postdoctoral Science Foundation(2020M671242 and 2021T140688) the Special Research Assistant program of CAS the Super Postdoctoral Fellow Program of Shanghai 

主　　题：heterostructure encapsulation SnO2/Nb2O5 interface chemical interaction atom migration 

摘      要：Rationally designed heterostructures provide attractive prospects for energy storage electrodes by combining different active materials with distinct electrochemical ***,through a phase separation strategy,a heterostructure of SnO_(2) encapsulated by amorphous Nb_(2)O_(5) is spontaneously ***-type anode Nb_(2)O_(5) outer shell,playing as reaction containers and fast ionic pathways,physically inhibits the Sn atoms’migration and enhances the reaction ***,strong chemical interactions are found at the SnO_(2)/Nb_(2)O_(5) interfaces,which ensure the solid encapsulation of the SnO_(2) cores even after 500 *** used for lithium-ion batteries,this heterostructured anode exhibits high cycling stability with a capacity of 626 mAhg^(-1) after 1000 cycles at 2Ag^(-1)(85% capacity retention)and good rate performance with the capacity of 340 mAhg^(-1) at 8Ag^(-1).