Skip to main content
. 2017 Feb 8;3(2):135–140. doi: 10.1021/acscentsci.6b00389

Figure 4.

Figure 4

Electrochemical characterization of the electrodes for Li deposition/dissolution. (a, b) Comparison of Coulombic efficiency of Li metal anode with and without SiO2@PMMA nanosphere coating at various current rates of (a) 0.5 mA cm–2 and (b) 1.0 mA cm–2 with the same areal capacity of 2.0 mAh cm–2. (c) Experimental impedance spectra for the electrode with and without interfacial layer of SiO2@PMMA nanospheres before and after the first and 10th cycles. (d) Experimental and fitted impedance spectra for the electrode with and without coating after the 10th cycle, and equivalent circuit. In the equivalent circuit, R1 is the electrolyte resistance. R2 and R3 correspond to the current collector/electrolyte interface and Li/electrolyte interface, respectively. CPE1 and CPE2 are the constant phase elements to fit capacitances. The straight line in the lower frequencies is due to an ion diffusion limited process contributing to an impedance response (Warburg impedance Zw).