Single-ion conducting polymer electrolyte for Li||LiNi0.6Mn0.2Co0.2O2 batteries—impact of the anodic cutoff voltage and ambient temperature

Abstract Polymer-based electrolytes potentially enable enhanced safety and increased energy density of lithium-metal batteries employing high capacity, transition metal oxide–positive electrodes. Herein, we report the investigation battery cells comprising Li[Ni 0.6 Mn 0.2 Co ]O 2 as active material for positive electrode a poly(arylene ether sulfone)-based single-ion conductor electrolyte incorporating ethylene carbonate (EC) selectively coordinating molecular transporter. The resulting provide very stable cycling more than 300 cycles accompanied by excellent average Coulombic efficiency (99.95%) at an anodic cutoff potential 4.2 V. To further increase achievable density, stepwise to 4.3 V 4.4 is herein investigated, highlighting that polymer offers comparable stability, least, common liquid organic electrolytes. Moreover, impact temperature EC content on rate capability evaluated, showing with higher offer capacity retention 2C equal 61% recorded 0.05 C 60 °C.