期刊
ELECTROCHIMICA ACTA
卷 212, 期 -, 页码 758-766出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.07.080
关键词
Lithium metal anode; Lithium-Stannum alloy; Electrodeposition; Lithium dendrite; Electrolyte
资金
- National Natural Science Foundation of China [21233004]
The effects of adding potassium ion (K+) to lithium oxalyldifluroborate (LiODFB)/ethylene carbonate (EC) + dimethyl carbonate (DMC) (1 1 vol.%) electrolyte on the cycle behaviors of lithium deposition-stripping on a Li22Sn5 substrate electrode are investigated. The functions and mechanism of K+ addition to the electrolyte are evaluated through scanning electron microscopy (SEM), inductively coupled plasma-atomic emission spectrometry (ICP-AES), element mapping, energy dispersive spectrometer (EDS), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) analyses. The addition of K+ to the electrolyte significantly improves the morphology of the lithium deposits and the cycleability of lithium deposition-stripping. K+ is not reduced nor incorporated on the substrate during lithium deposition. Based on the reported self-healing electrostatic shield (SHES) mechanism, this study proposes the SHES-kinetics mechanism, which considers both kinetic and thermodynamic factors. (C) 2016 Published by Elsevier Ltd.
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