Journal
ACS ENERGY LETTERS
Volume 3, Issue 9, Pages 2259-+Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b01244
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Funding
- National Key RAMP
- D Program of China [2016YFA0202500]
- National Natural Science Foundation of China [51822211]
- Beijing Municipal Science AMP
- Technology Commission [Z181100004518003, Z171100000917021]
- Chinese Academy of Sciences
- Thousand Talents Program for Young Scientists
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Dendrite growth is one of the major problems that hinder the practical application of lithium metal electrodes in rechargeable lithium batteries. Herein, we report that the thin-film Cu3N coating can greatly suppress the lithium dendrite growth on the Cu current collector. Li vertical bar Cu and LiFePO4 vertical bar Cu cells using thin-film Cu3N-modified Cu foil as electrode exhibit improved cyclic stability and low charge-discharge over-potential. A multifaceted investigation demonstrates that Cu3N can convert to Li3N/Cu nanocomposite after initial lithium plating, forming in situ a highly homogeneous conductive network. The peak-force tunneling atomic force microscopy experiments enable the direct measurement of the surface conductivity, confirming the improved distribution uniformity for the Cu3N-modified Cu. These findings suggest that the uniformity of surface electronic conductivity is an important factor for homogeneous lithium plating-stripping, and in situ formation of a nanoconductive network via conversion reaction could be an effective way to smoothen surface conductivity and thus to achieve high uniformity.
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