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Adv Mater. 2018 Mar;30(10). doi: 10.1002/adma.201706216. Epub 2018 Jan 15.

Uniform Lithium Nucleation/Growth Induced by Lightweight Nitrogen-Doped Graphitic Carbon Foams for High-Performance Lithium Metal Anodes.

Liu L1,2, Yin YX1,2, Li JY1,2, Wang SH1, Guo YG1,2, Wan LJ1,2.

Author information

1
CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, 100190, P. R. China.
2
School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences (CAS), Beijing, 100049, P. R. China.

Abstract

The lithium metal anode has attracted soaring attention as an ideal battery anode. Unfortunately, nonuniform Li nucleation results in uncontrollable growth of dendritic Li, which incurs serious safety issues and poor electrochemical performance, hindering its practical applications. Herein, this study shows that uniform Li nucleation/growth can be induced by an ultralight 3D current collector consisting of in situ nitrogen-doped graphitic carbon foams (NGCFs) to realize suppressing dendritic Li growth at the nucleating stage. The N-containing functional groups guide homogenous growth of Li nucleus nanoparticles and the initial Li nucleus seed layer regulates the following well-distributed Li growth. Benefiting from such favorable Li growth behavior, superior electrochemical performance can be achieved as evidenced by the high Coulombic efficiency (≈99.6% for 300 cycles), large capacity (10 mA h cm-2 , 3140 mA h g-1NGCF-Li ), and ultralong lifespan (>1200 h) together with low overpotential (<25 mV at 3 mA cm-2 ); even under a high current density up to 10 mA cm-2 , it still displays low overpotential of 62 mV.

KEYWORDS:

3D current collector; large capacity; lithium metal anodes; nitrogen-doped graphitic carbon foams; uniform lithium nucleation

PMID:
29334147
DOI:
10.1002/adma.201706216

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