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Issue 19, 2017
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The long life-span of a Li-metal anode enabled by a protective layer based on the pyrolyzed N-doped binder network

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Abstract

Attempts to utilize lithium metal in secondary batteries are seriously restricted by its uncontrollable side reactions with the electrolyte solvent. Here we utilize a protective porous structure based on the pyrolyzed PAN binder to stabilize the electrolyte/lithium interface to prolong its working life. With the increase of pyrolysis temperatures, the treated PAN fibers possess two mutational points in mechanical properties located at ∼300 & ∼700 °C, and exhibit carbon-like characteristics at ∼400 °C and higher. Compared to the control electrode, the cyclic life-span of the treated electrodes can increase 1.8 times at the first mutational point, and surprisingly rise to 12 & 7 times for the samples pyrolyzed at 400 & 500 °C, then fall back to 1.6 times at the second mutational point. These results reveal that the stable operation of lithium plating/stripping could be provided by the internal interwoven SEI layer grown on the carbon-like binder network with appropriate rigidity. Among the investigated systems, the protective structure treated at 400 °C can stably operate for 350 cycles with an average coulombic efficiency as high as ∼98%, which is the best efficiency recorded for carbonate-based electrolytes to date.

Graphical abstract: The long life-span of a Li-metal anode enabled by a protective layer based on the pyrolyzed N-doped binder network

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Publication details

The article was received on 10 Mar 2017, accepted on 03 Apr 2017 and first published on 03 Apr 2017


Article type: Paper
DOI: 10.1039/C7TA02144E
Citation: J. Mater. Chem. A, 2017,5, 9339-9349
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    The long life-span of a Li-metal anode enabled by a protective layer based on the pyrolyzed N-doped binder network

    Z. Zhang, Z. Peng, J. Zheng, S. Wang, Z. Liu, Y. Bi, Y. Chen, G. Wu, H. Li, P. Cui, Z. Wen and D. Wang, J. Mater. Chem. A, 2017, 5, 9339
    DOI: 10.1039/C7TA02144E

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