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Issue 5, 2020
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Trace fluorinated-carbon-nanotube-induced lithium dendrite elimination for high-performance lithium–oxygen cells

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Abstract

Lithium metal has attracted considerable attention due to its ultrahigh theoretical capacity. Nevertheless, issues such as dendritic Li formation and instability of the Li metal/electrolyte interface still restrain its practical applications. In this work, we design a Li composite anode with fluorinated carbon nanotubes (FCNT) fabricated by a simple melting–soaking method. It was found that trace amounts of added FCNT (only 1.6 wt%) lead to a significant chemical/electrochemical stability of metallic Li. The obtained Li/FCNT composite electrode (LFCNT) exhibits much better stability in open air and electrolyte than bare Li. The LFCNT enables uniform plating/stripping of metallic Li, preventing the dendrite formation during repeated cycling. In situ optical microscopy observations confirm dendrite-free Li deposition with the mechanism clarified by density functional theory calculations. Compared with bare Li, the LFCNT shows a considerable improvement in rate capability, voltage hysteresis and cycle performance, sustaining stable cycling at a high current density of 3 mA cm−2 or a capacity up to 5 mA h cm−2. Li–O2 cells with a LFCNT anode exhibit a long life of 135 cycles at a capacity of 1000 mA h g−1, which is six-fold than that with the bare Li anode.

Graphical abstract: Trace fluorinated-carbon-nanotube-induced lithium dendrite elimination for high-performance lithium–oxygen cells

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Supplementary files

Article information


Submitted
15 Nov 2019
Accepted
30 Dec 2019
First published
31 Dec 2019

Nanoscale, 2020,12, 3424-3434
Article type
Paper

Trace fluorinated-carbon-nanotube-induced lithium dendrite elimination for high-performance lithium–oxygen cells

H. Cheng, Y. Mao, Y. Lu, P. Zhang, J. Xie and X. Zhao, Nanoscale, 2020, 12, 3424
DOI: 10.1039/C9NR09749J

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