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Long life-span of Li-metal anode enabled by a protective layer based on the pyrolyzed N-doped binder network

Abstract

The attempts to utilize Lithium metal in secondary batteries are seriously restricted by its uncontrollable side reactions with electrolyte solvent. Here we tend to utilize a protective porous structure based on pyrolyzed PAN binder to stabilize the electrolyte/lithium interface to prolong its working life. As the increase of pyrolysis temperatures, the treated PAN fibers possess two mutational points in mechanical-properties located at ~300 & ~700 ℃, and exhibit carbon-like characteristics at ~400 ℃ and higher temperatures. Compared to the control electrode, the cyclic life-span of the treated electrodes can extend 1.8 times at the first mutational point, and surprisingly rise to 12 & 7 times for the samples pyrolyzed at 400 & 500 ℃, 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 tightly 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 ℃ can stably operate for 350 cycles with an average columbic efficiency as high as ~98%, which represents the best record in the carbonate-based electrolytes.

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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, Accepted Manuscript
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    Long life-span of 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, Accepted Manuscript , DOI: 10.1039/C7TA02144E

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