Selenium and selenium-sulfur cathode materials for high-energy rechargeable magnesium batteries

JOURNAL OF POWER SOURCES

卷:323

Article

Zhao-Karger, Zhirong¹  Lin, Xiu-Mei²  Minella, Christian Bonatto¹  Wang, Di¹  Diemant, Thomas³  Behm, R. Juergen^2,3  Fichtner, Maximilian^1,2 

[1] Karlsruhe Inst Technol, Inst Nanotechnol, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany

[2] Karlsruhe Inst Technol, Helmholtz Inst Ulm Electrochem Energy Storage HIU, Helmholtzstr 11, D-89081 Ulm, Germany

[3] Univ Ulm, Inst Surface Chem & Catalysis, Albert Einstein Allee 47, D-89081 Ulm, Germany

关键词: Rechargeable Mg battery;    Selenium cathode;    Selenium-sulfur cathode;    Electrochemical reactions;   

DOI  :  10.1016/j.jpowsour.2016.05.034

来源: Elsevier

【 摘 要 】

Magnesium (Mg) is an attractive metallic anode material for next-generation batteries owing to its inherent dendrite-free electrodeposition, high capacity and low cost. Here we report a new class of Mg batteries based on both elemental selenium (Se) and selenium-sulfur solid solution (SeS2) cathode materials. Elemental Se confined into a mesoporous carbon was used as a cathode material. Coupling the Se cathode with a metallic Mg anode in a non-nucleophilic electrolyte, the Se cathode delivered a high initial volumetric discharge capacity of 1689 mA h cm(-3) and a reversible capacity of 480 mA h cm(-3) was retained after 50 cycles at a high current density of 2 C. The mechanistic insights into the electrochemical conversion in Mg-Se batteries were investigated by microscopic and spectroscopic methods. The structural transformation of cyclic Se-8 into chainlike Se-n upon battery cycling was revealed by ex-situ Raman spectroscopy. In addition, the promising battery performance with a SeS2 cathode envisages the perspective of a series of SeSn cathode materials combining the benefits of both selenium and sulfur for high energy Mg batteries. (C) 2016 Elsevier B.V. All rights reserved.

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