Process for a Free-Standing and Stable All-Metal Structure for Symmetrical Lithium-Oxygen Batteries.
ACS Nano
; 14(3): 3281-3289, 2020 Mar 24.
Article
em En
| MEDLINE
| ID: mdl-32119516
ABSTRACT
A number of inherent and thorny obstacles still stand in the way of the practical application of Li-O2 batteries, which require development of an advanced lithium anode and O2 cathode. Herein, the strategy of a symmetrical Li-O2 battery is presented. Specifically, Cu nanoneedle arrays with a nanoengineered Au coating are grown directly on a Cu foam substrate (Au/Cu@FCu), which can act as both the anode backbone and the cathode in a Li-O2 battery. The excellent conductivity, high porosity, large specific surface, and superior lithiophilicity as well as high catalytic activity of the Au/Cu@FCu electrodes can simultaneously regulate the deposition behavior of the lithium metal in the anode and catalyze the formation/decomposition of Li2O2 in the cathode. As a result, the Li uniformly deposited on the Au/Cu@FCu anode without Li dendrites, showing a high Coulombic efficiency over 96% and a long and stable cycle lifetime over 970 h. At the same time, the Au/Cu@FCu cathode demonstrates extremely low overpotentials (0.64 V) and a much higher specific capacity of 27â¯270 mAh g-1 compared to the Li-O2 batteries with a carbon-free cathode reported to date. Moreover, the "ebb and flow" phenomenon of the anode and cathode morphology is also observed in the Li-O2 battery.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2020
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Article