期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 5, 期 19, 页码 9339-9349出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta02144e
关键词
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资金
- Strategic Priority Research Program [XDA09010403]
- National Natural Science Foundation of China [51502334]
- Zhejiang Provincial Natural Science Foundation of China [Q17E020023]
- National Natural Science Foundation of China (NSFC) for the research fund for International Young Scientists [51650110490]
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 similar to 300 & similar to 700 degrees C, and exhibit carbon-like characteristics at similar to 400 degrees 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 degrees 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 degrees C can stably operate for 350 cycles with an average coulombic efficiency as high as similar to 98%, which is the best efficiency recorded for carbonate-based electrolytes to date.
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