Lithiophilic N-doped carbon bowls induced Li deposition in layered graphene film for advanced lithium metal batteries

Lithium (Li) metal with high theoretical capacity and low electrochemical potential is the most ideal anode for next-generation high-energy batteries. However, the practical implementation of Li anode has been hindered by dendritic growth and volume expansion during cycling, which results in low Cou...

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Bibliographic Details
Published in:Nano research 2022, Vol.15 (1), p.352-360
Main Authors: Feng, Xiaoyu, Wu, Hong-Hui, Gao, Biao, Świętosławski, Michał, He, Xin, Zhang, Qiaobao
Format: Article
Language:English
Subjects:
Anodes
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Carbon
Chemistry and Materials Science
Condensed Matter Physics
Current density
Cycles
Dendritic structure
Electrochemical potential
Electrochemistry
Electrodes
Graphene
Hybrids
Life span
Lithium
Lithium batteries
Local current
Long range order
Materials Science
Metals
Nanotechnology
Nucleation
Research Article
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Summary:Lithium (Li) metal with high theoretical capacity and low electrochemical potential is the most ideal anode for next-generation high-energy batteries. However, the practical implementation of Li anode has been hindered by dendritic growth and volume expansion during cycling, which results in low Coulombic efficiency (CE), short lifespan, and safety hazards. Here, we report a highly stable and dendrite-free Li metal anode by utilizing N-doped hollow porous bowl-like hard carbon/reduced graphene nanosheets (CB@rGO) hybrids as three-dimensional (3D) conductive and lithiophilic scaffold host. The lithiophilic carbon bowl (CB) mainly works as excellent guides during the Li plating process, whereas the rGO layer with high conductivity and mechanical stability maintains the integrity of the composite by confining the volume change in long-range order during cycling. Moreover, the local current density can be reduced due to the 3D conductive framework. Therefore, CB@rGO presents a low lithium metal nucleation overpotential of 18 mV, high CE of 98%, and stable cycling without obvious voltage fluctuation for over 600 cycles at a current density of 1 mA·cm −2 . Our study not only provides a good CB@rGO host and pre-Lithiated CB@rGO composite anode electrode, but also brings a new strategy of designing 3D electrodes for those active materials suffering from severe volume expansion.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-021-3482-0