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Application of Li2S to Compensate for Loss of Active Lithium in Si-C anode


Mixed silicon and carbon (Si-C) materials with high capacity are ideal candidates for the substitution of graphite or other carbon anodes in lithium-ion batteries. However, the low coulombic efficiency of the Si-C anode in the first cycle due to the formation of a solid electrolyte interphase and the consumption of active lithium have hindered its commercial applications. Here, we report using Li2S as a prelithiation material to compensate for the loss of active lithium in the first cycle and, consequently, to enhance the specific energy of lithium-ion batteries. The Si-C anode has an initial discharge specific capacity of ~738 mAh/g and a charge specific capacity of ~638 mAh/g. The prelithiation material with a core-shell structure is prepared by mixing Li2S, Ketjenblack (KB) and poly(vinylpyrrolidone) (PVP) in anhydrous ethanol, which shows a high irreversible capacity of ~1084 mAh/g. The effect of the compensation of lost active lithium is verified via a LiFePO4 (Li2S)/Si-C full cell, which exhibits not only a high specific capacity but also a stable cycling performance. The specific energy of the LiFePO4 (Li2S)/Si-C full cell shows a remarkable increase compared to the LiFePO4/Si-C full cell, exhibiting ~13.4%, ~26.7%, ~65.0% and ~110.2% more specific energy after the 1st, 10th, 100th and 200th cycle, respectively.

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Publication details

The article was received on 16 Jan 2018, accepted on 12 Mar 2018 and first published on 14 Mar 2018

Article type: Communication
DOI: 10.1039/C8TA00496J
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Application of Li2S to Compensate for Loss of Active Lithium in Si-C anode

    Y. Zhan, H. Yu, L. Ben, B. N. Liu, Y. Chen, Y. Wu, W. Zhao, H. Li and X. Huang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA00496J

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