Journal
JOURNAL OF POWER SOURCES
Volume 277, Issue -, Pages 304-311Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.12.023
Keywords
Lithium nitride film; Metallic lithium; Nitridation; Dendrite formation
Funding
- National Natural Science Foundation of China [51271167]
- National Science and Technology Support Program [2012BAC08B08]
- Program for Innovative Research Team in University of Ministry of Education of China [IRT13037]
- Key Science and Technology Innovation Team of Zhejiang Province [2010R50013]
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To overcome the dendrite formation of metallic lithium anodes, polycrystalline Li3N films are coated on Li foil by an ex-situ nitridation method. The electrochemical performances of the Li3N-modified Li electrodes are investigated by galvanostatic charge/discharge tests, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) to determine the optimized nitridation condition. The morphologies and structures for the pure Li and the Li3N-modified Li electrodes, both before and after cycling, are characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The Li3N films on Li surface can efficiently prevent the contact between Li and the electrolyte, and reduce the side reaction, thus suppressing the formation of dendritic lithium effectively. (C) 2014 Elsevier B.V. All rights reserved.
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