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Issue 25, 2017
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Ionic conductivity promotion of polymer electrolyte with ionic liquid grafted oxides for all-solid-state lithium–sulfur batteries

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Abstract

Recently, great attention has been paid to all-solid-state lithium–sulfur (Li–S) batteries for their high energy density and security. But large-scale application of this technology is hindered by the poor ionic conductivity of solid-state electrolytes and high interfacial resistance at ambient temperature. In addition, seeking an appropriate carbon matrix for solid-state Li–S batteries is challenging. Herein, with the purpose of addressing these problems, N-doped carbon nanosheets (N-CNs) as a matrix for optimizing a sulfur cathode was successfully prepared. Furthermore, we fabricated innovative poly(ethylene oxide) (PEO)-based solid-state polymer electrolytes (SSPEs) containing ionic liquid grafted oxide nanoparticles (IL@NPs), which showed high ionic conductivity at low temperatures. Additionally, the differences among IL@NPs based on ZrO2, TiO2, and SiO2 are compared. The electrolyte with IL@ZrO2 showed the highest ionic conductivity of 4.95 × 10−4, 2.32 × 10−4 S cm−1 at 50 and 37 °C, respectively. With advanced and innovative designs in both cathode and electrolyte, our solid-state Li–S battery exhibits improved electrochemical performance. The battery with SSPEs based on IL@ZrO2 delivered a high specific capacity of 986, 600 mA h g−1 at 50 and 37 °C, respectively. It's believed that this strategy, using IL@NPs added SSPEs and the N-CNs/S cathode, may shed light on prospective applications with all-solid-state Li–S batteries.

Graphical abstract: Ionic conductivity promotion of polymer electrolyte with ionic liquid grafted oxides for all-solid-state lithium–sulfur batteries

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Publication details

The article was received on 29 Apr 2017, accepted on 24 May 2017 and first published on 24 May 2017


Article type: Paper
DOI: 10.1039/C7TA03699J
Citation: J. Mater. Chem. A, 2017,5, 12934-12942
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    Ionic conductivity promotion of polymer electrolyte with ionic liquid grafted oxides for all-solid-state lithium–sulfur batteries

    O. Sheng, C. Jin, J. Luo, H. Yuan, C. Fang, H. Huang, Y. Gan, J. Zhang, Y. Xia, C. Liang, W. Zhang and X. Tao, J. Mater. Chem. A, 2017, 5, 12934
    DOI: 10.1039/C7TA03699J

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