标题：Self-supporting, eutectic-like, nanoporous biphase bismuth-tin film for high-performance magnesium storage
作者：Song, Meijia; Niu, Jiazheng; Yin, Kuibo; Gao, Hui; Zhang, Chi; Ma, Wensheng; Luo, Fakui; Peng, Zhangquan; Zhang, Zhonghua
作者机构：[Song, Meijia; Niu, Jiazheng; Gao, Hui; Ma, Wensheng; Luo, Fakui; Zhang, Zhonghua] Shandong Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Liquid Soli 更多
通讯作者：Zhang, ZH;Zhang, Zhonghua
通讯作者地址：[Zhang, ZH]Shandong Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Jingshi Rd 17923, Jinan 250061, Shandong, Pe 更多
关键词：magnesium ion batteries; alloying-type anode; biphase bismuth-tin film;; hierarchically porous structure; magnetron cosputtering
摘要：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.