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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.


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Self-supporting, eutectic-like, nanoporous biphase bismuth-tin film for high-performance magnesium storage

Show Author's information Meijia Song1,§Jiazheng Niu1,§Kuibo Yin2Hui Gao1Chi Zhang3Wensheng Ma1Fakui Luo1Zhangquan Peng4Zhonghua Zhang1( )
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education),School of Materials Science and Engineering, Shandong University, Jingshi Road 17923,Jinan,250061,China;
SEU-FEI Nano-Pico Center,Key Lab of MEMS of Ministry of Education, Southeast University,Nanjing,210096,China;
School of Applied Physics and Materials,Wuyi University, Dongcheng Village 22,Jiangmen,529020,China;
State Key Laboratory of Electroanalytical Chemistry,Changchun Institute of Applied Chemistry, Chinese Academy of Sciences,Changchun,130022,China;

§ Meijia Song and Jiazheng Niu contributed equally to this work.

Abstract

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.

Keywords: hierarchically porous structure, magnesium ion batteries, alloying-type anode, biphase bismuth-tin film, magnetron cosputtering

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Publication history
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Acknowledgements

Publication history

Received: 13 October 2018
Revised: 12 December 2018
Accepted: 04 January 2019
Published: 25 January 2019
Issue date: April 2019

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© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Acknowledgements

Acknowledgements

The authors gratefully acknowledge financial support by National Natural Science Foundation of China (Nos. 51671115 and 51871133), the support of Department of Science and Technology of Shandong Province for Young Tip-top Talent Support Project, and Young Tip-top Talent Support Project (the Organization Department of the Central Committee of the CPC).

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