Development of Nonaqueous Electrolytes for High-Voltage K-Ion Batteries
Tomooki Hosaka, Shinichi Komaba
Abstract
Abstract K-ion batteries (KIBs) are a widely attractive alternative to Li-ion batteries. While avoiding scarce/toxic elements in their construction, the low standard electrode potential of K+/K allows a low cut-off potential of the negative electrode and high operation voltages that are competitive with those observed in LIBs. Because of the wide operating potential range, developing improved non-aqueous electrolytes with higher oxidation stability and the ability to passivate low-potential negative electrodes is one of the major challenges of high-voltage KIB production. This account primarily covers our recent studies on non-aqueous electrolytes design based on potassium salt and solvent properties. We also discuss remaining/emerging challenges and provide our perspective on non-aqueous electrolytes for high-voltage KIBs.