Fig. 6
From: Designable ultra-smooth ultra-thin solid-electrolyte interphases of three alkali metal anodes
Electrochemical performance of polished Na and K anodes. a–c Voltage profiles of symmetric Na cells with soaked (a) and polished (b, c) Na foil electrodes using electrolyte of 1 M NaOTf in diglyme. d, e Coulombic efficiency (d) and voltage profiles (e) of asymmetric Cu||Na cells using electrolyte of 1 M NaOTf in diglyme at a current density of 2 mA cm−2. Both of the Cu and Na electrodes were covered with SEIs created by the ESP process (see Methods section). f The optical images of soaked and polished Na foils after 400 cycles
