Fig. 2: Investigation of structural changes in SEI upon ageing.
From: Borate–pyran lean electrolyte-based Li-metal batteries with minimal Li corrosion
a,b, Cryo-TEM (a), corresponding FFT (insets) and inverse FFT (b) images obtained from crystallite signals of SEI layers formed on Li-metal deposit (1.0 mA cm−2, 1.0 mAh cm−2) in LiPF6 EC:EMC:VC, LiFSI DME:TTE and borate–pyran electrolytes at t = 0 and 12 h (t represents the storage time after completion of Li deposition). c, Thickness of SEI on as-deposited Li and 12-h-aged Li. The data are represented by measuring the thickness of different locations (n = 14) for each sample. Dots represent raw data, boxes represent the 25–75% range, and in-box horizontal lines represent mean values. The whisker lines represent the maximum and minimum values without outliers. d,e, Atomic concentrations obtained from XPS survey scan and deconvoluted O 1s and F 1s XPS spectra of SEI for the borate–pyran electrolyte before (d) and after (e) 12 h ageing.
