Lithiophilic Co/Co4N nanoparticles embedded in hollow N-doped carbon nanocubes stabilizing lithium metal anodes for Li–air batteries

The metallic Li electrode is considered as the most promising anode candidate for next-generation rechargeable batteries due to its super-high energy density. However, the safety and passivation issue, low coulombic efficiency and short cycle-life derived from uneven Li dendrites and an unstable sol...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2018, Vol.6 (44), p.22096-22105
Main Authors: Guo, Ziyang, Wang, Fengmei, Li, Zijian, Yang, Yu, Andebet Gedamu Tamirat, Haocheng Qi, Han, Jishu, Li, Wei, Wang, Lei, Feng, Shouhua
Format: Article
Language:English
Subjects:
Air batteries
Anodes
Batteries
Carbon
Cobalt
Dendrites
Electrodes
Flux density
Graphitization
Lithium
Metal-organic frameworks
Metals
Nanoparticles
Nitrogen
Pyrolysis
Rechargeable batteries
Solid electrolytes
Storage capacity
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Summary:The metallic Li electrode is considered as the most promising anode candidate for next-generation rechargeable batteries due to its super-high energy density. However, the safety and passivation issue, low coulombic efficiency and short cycle-life derived from uneven Li dendrites and an unstable solid electrolyte interphase (SEI) have hindered the practical application of Li metal batteries, especially Li–air batteries. Herein, we have synthesized Co4N-doped Co nanoparticles embedded into hollow nitrogen (N)-doped carbon nanocubes (Co/Co4N-NC) through the pyrolysis of a metal–organic framework (MOF), and further applied it as the Li plating matrix. The high content of lithiophilic Co4N, pyridinic and pyrrolic N species in Co/Co4N-NC can effectively ensure the uniform distribution of Li. In addition, the intercalation reaction in graphitized carbon coupled with electrodeposition reaction in the porous framework can further enhance the Li storage capacity of Co/Co4N-NC. Moreover, we have also demonstrated the formation of a stable SEI layer on the Co/Co4N-NC electrode during the Li plating process. Hence, the Co/Co4N-NC electrode can significantly suppress dendritic Li and shows a high coulombic efficiency of 98.5% over 300 cycles. More importantly, a Li–air battery using the lithiated Co/Co4N-NC electrode displays better cycle performance than a Li–air cell with a Li-anode in ambient air.
ISSN:2050-7488
2050-7496
DOI:10.1039/c8ta05013a