Enhanced cycleability and dendrite-free lithium deposition by adding potassium ion to the electrolyte for lithium metal batteries
By Xu, Qian; Yang, Yifu; Shao, Huixia
Published in Electrochimica Acta
NULL
2016
Abstract
Abstract 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
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