Artificial solid electrolyte interphase based on polyacrylonitrile for homogenous and dendrite-free deposition of lithium metal

Xu Hang-Yu^{1, 2}, Li Quan^{1, 2}, Pan Hong-Yi^{1, 2}, Qiu Ji-Liang^{1, 2}, Cao Wen-Zhuo^{1, 2}, Yu Xi-Qian^{1, 2, ‡}, Li Hong^{1, 2, †}

Electrochemical characterizations of Cu electrodes with no coating, pristine PAN coating, and heat-treated PAN coating in Li|Cu cells. (a) Coulombic efficiency at a constant current density of 0.5mA·cm−2 of the Cu electrode (loading capacity 1.0mAh·cm−2). (b) The corresponding galvanostatic discharge/charge profiles of the 1st cycle. Impedance spectra of pristine (c) Li|Cu cells and (d) cycled cells at open circuit potential after the 70th discharge. The scattered dots in panel (d) represent impedance data while the solid lines are fitting curves.