Archive | 2019
Microwave Processed, Onionlike Carbon and Fluoropolymer Passivated Lithium Metal Electrode for Enhanced Li Stripping/Plating Performance
Abstract
One key limitation of lithium metal electrodes is their propensity for dendrite formation that limits their use in commercial batteries. Here, a simple surface modification method was demonstrated to improve the electrochemical stability of the lithium metal electrode through direct coating of onionlike carbon (OC) and a fluoropolymer onto the lithium metal electrode. Selective and rapid microwave heating of the OC resulted in the in situ formation of a LiF-rich composite with the simultaneous infiltration of lithium into the OC. The electrochemical stability of the modified electrode was compared with a neat lithium metal electrode using symmetric stripping/plating cells. The microwave processed surface coating acted as a robust and stable passivation layer to prevent electrolyte decomposition, while also suppressing fast dendrite growth. The potential stability during the stripping and plating was enhanced at all rates examined (0.5–2 mA/cm2) by this passivation layer. With the stripping/plating capacit...