Self-supporting, eutectic-like, nanoporous biphase bismuth-tin film for high-performance magnesium storage
Self-supporting, eutectic-like, nanoporous biphase bismuth-tin film for high-performance magnesium storage
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用于高性能镁存储的自支撑、类共晶、纳米多孔双相铋锡薄膜
DOI：
10.1007/s12274-019-2291-1
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发表时间：
2019
期刊：
影响因子：
9.9
通讯作者：
Zhang Zhonghua
中科院分区：
文献类型：
--
作者：
Song Meijia;Niu Jiazheng;Yin Kuibo;Gao Hui;Zhang Chi;Ma Wensheng;Luo Fakui;Peng Zhangquan;Zhang Zhonghua
镁离子电池正在成为锂离子电池的有前途的替代品，因为它们的优势包括高能密度，无树突的特征和低成本。然而，镁离子电池的主要挑战之一是动力学缓慢的镁插入/提取和电极材料中的扩散。针对这个问题，本文设计了双相共晶型bismuth-tin膜，旨在构建具有相互插入相位分布和层次多孔结构的自支撑阳极，并通过便捷的一步木磁性辅助途径进一步制造。通过单相二晶或锡膜的基准测试，Biphase Bismuth-Tin膜可提供高特异性容量（538 mAh/g时50 mA/g），出色的速率性能（417 mAh/g，1,000 mA/g）和良好的循环稳定性（在200th周期为233 mAh/g）。溅射的鞭毛丁物薄膜的上镁储存性能可归因于互插的二晶/锡相分布，层次多孔结构和Biphase缓冲矩阵的协同作用，这可能会增加离子传输通道，缩短扩散长度并减少总体积变化。
Magnesium ion batteries are emerging as promising alternatives to lithium ion batteries because of their advantages including high energy density, dendrite-free features and low cost. Nevertheless, one of the major challenges for magnesium ion batteries is the kinetically sluggish magnesium insertion/extraction and diffusion in electrode materials. Aiming at this issue, biphase eutectic-like bismuth-tin film is designed herein to construct a self-supporting anode with interdigitated phase distribution and hierarchically porous structure, and further fabricated by a facile one-step magnetron cosputtering route. As benchmarked with single-phase bismuth or tin film, the biphase bismuth-tin film delivers high specific capacity (538 mAh/g at 50 mA/g), excellent rate performance (417 mAh/g at 1,000 mA/g) and good cycling stability (233 mAh/g at the 200th cycle). The superior magnesium storage performance of the sputtered bismuth-tin film could be attributed to the synergetic effect of the interdigitated bismuth/tin phase distribution, hierarchically porous structure and biphase buffering matrices, which could increase ionic transport channels, shorten diffusion lengths and reduce total volume changes.