材料科学
碳纳米纤维
锂(药物)
纳米纤维
碳纤维
化学工程
壳体(结构)
纳米技术
复合材料
碳纳米管
复合数
医学
工程类
内分泌学
作者
Weixin Song,Xinhua Liu,Billy Wu,Nigel P. Brandon,Paul R. Shearing,Dan J. L. Brett,Fazhi Xie,David Riley
标识
DOI:10.1016/j.ensm.2018.12.012
摘要
Metallic Sn has high conductivity and high theoretical capacity for lithium storage but it suffers from severe volume change in lithiation/delithiation leading to capacity fade. Yolk-shell and core-shell [email protected] spheres interconnected by carbon nanofibers were synthesized by thermal vapor and thermal melting of electrospun nanofibers to improve the cycling stability. Sn particles in yolk-shell spheres undergo dynamic structure evolution during thermal melting to form core-shell spheres. The core-shell spheres linked along the carbon nanofibers show outstanding performance and are better than the yolk-shell system for lithium storage, with a high capacity retention of 91.8% after 1000 cycles at 1 A g-1. The superior structure of core-shell spheres interconnected by carbon nanofibers has facile electron conductivity and short lithium ion diffusion pathways through the carbon nanofibers and shells, and re-develops [email protected] structures with Sn clusters embedded into carbon matrix during electrochemical cycling, enabling the high performance.
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