Recent Advances in Non‐Aqueous Liquid Electrolytes for High‐Voltage Sodium‐Ion Batteries

ABSTRACT Sodium‐ion batteries are considered one of the most promising candidates for lithium‐ion batteries. Increasing charging voltage is an effective way to realize sodium‐ion batteries with low cost and high energy density. However, the narrow voltage window of the existing electrolyte is a serious constraint. This review systematically summarizes the development of electrolytes for high‐voltage sodium‐ion batteries in recent years. Firstly, the basic characteristics and critical influencing factors of high‐voltage electrolytes are presented. Secondly, the strategies of developing high‐voltage sodium‐ion electrolytes in recent years are systematically summarized, including the regulation of solvation structure, the characteristics and applications of new high voltage resistant solvents, and the action mechanism of high‐voltage additives. Finally, the future development trend of sodium‐ion high‐voltage electrolytes is proposed, aiming to promote the breakthrough and application of high energy density sodium‐ion batteries.