材料科学
阳极
纳米颗粒
锡
化学工程
纳米复合材料
电化学
热解
多孔性
碳纤维
钠
纳米技术
电极
离子
复合材料
冶金
复合数
有机化学
化学
工程类
物理化学
作者
Yongchang Liu,Ning Zhang,Lifang Jiao,Zhanliang Tao,Jun Chen
标识
DOI:10.1002/adfm.201402943
摘要
Designed as a high‐capacity, high‐rate, and long‐cycle life anode for sodium‐ion batteries, ultrasmall Sn nanoparticles (≈8 nm) homogeneously embedded in spherical carbon network (denoted as 8‐Sn@C) is prepared using an aerosol spray pyrolysis method. Instrumental analyses show that 8‐Sn@C nanocomposite with 46 wt% Sn and a BET surface area of 150.43 m 2 g −1 delivers an initial reversible capacity of ≈493.6 mA h g −1 at the current density of 200 mA g −1 , a high‐rate capacity of 349 mA h g −1 even at 4000 mA g −1 , and a stable capacity of ≈415 mA h g −1 after 500 cycles at 1000 mA g −1 . The remarkable electrochemical performance of 8‐Sn@C is owing to the synergetic effects between the well‐dispersed ultrasmall Sn nanoparticles and the conductive carbon network. This unique structure of very‐fine Sn nanoparticles embedded in the porous carbon network can effectively suppress the volume fluctuation and particle aggregation of tin during prolonged sodiation/desodiation process, thus solving the major problems of pulverization, loss of electrical contact and low utilization rate facing Sn anode.
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