 The voltage difference upon constant current charge and discharge is usually between 1.3 and 1.8 V (with an OCP of ca.4.2 V) even at such ridiculously low currents as 0.01–0.5 mA/cm² and 50–500 mA/g of C on the positive electrode (see Figure 2), However, the carbonate solvents evaporate and get oxidized due to a high overvoltage upon charge.Other solvents, such as end-capped glymes, DMSO, dimethylacetamide, and ionic liquids, have been considered.