A stable lithiated silicon–chalcogen battery via synergetic chemical coupling between silicon and selenium

KwangSup Eom, Jung Tae Lee, Martin Oschatz, Feixiang Wu, Stefan Kaskel, Gleb Yushin () and Thomas F. Fuller ()
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KwangSup Eom: Center for Innovative Fuel Cell and Battery Technologies, School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive, NW, Atlanta, Georgia 30332, USA
Jung Tae Lee: School of Materials Science and Engineering, Georgia Institute of Technology
Martin Oschatz: Dresden University of Technology
Feixiang Wu: School of Materials Science and Engineering, Georgia Institute of Technology
Stefan Kaskel: Dresden University of Technology
Gleb Yushin: School of Materials Science and Engineering, Georgia Institute of Technology
Thomas F. Fuller: Center for Innovative Fuel Cell and Battery Technologies, School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive, NW, Atlanta, Georgia 30332, USA

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract Li-ion batteries dominate portable energy storage due to their exceptional power and energy characteristics. Yet, various consumer devices and electric vehicles demand higher specific energy and power with longer cycle life. Here we report a full-cell battery that contains a lithiated Si/graphene anode paired with a selenium disulfide (SeS2) cathode with high capacity and long-term stability. Selenium, which dissolves from the SeS2 cathode, was found to become a component of the anode solid electrolyte interphase (SEI), leading to a significant increase of the SEI conductivity and stability. Moreover, the replacement of lithium metal anode impedes unwanted side reactions between the dissolved intermediate products from the SeS2 cathode and lithium metal and eliminates lithium dendrite formation. As a result, the capacity retention of the lithiated silicon/graphene—SeS2 full cell is 81% after 1,500 cycles at 268 mA gSeS2−1. The achieved cathode capacity is 403 mAh gSeS2−1 (1,209 mAh cmSeS2−3).

Date: 2017
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DOI: 10.1038/ncomms13888

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