Electrolyte Design Strategies to Construct Stable Cathode-Electrolyte Interphases for High-Voltage Sodium-Ion Batteries

Abstract

Elevating the working voltage of sodium-ion batteries is crucial for expanding their application scenarios. However, as the operating voltage of these batteries increases, the interfacial stability of existing electrolytes becomes inadequate to meet the demands of high-voltage cathode materials. Along with the interaction with cathode interface, electrolyte trends to be decomposed forming an interphase between the cathode and electrolyte, which plays an essential role in the performance of batteries. This review systematically focuses on the reconstruction of cathode-electrolyte interphase maintaining the interfacial stability via various strategies at high voltage range. The state-of-the-art characterization techniques and modeling approaches associated with cathode-electrolyte interphase are also discussed. From the perspective of electrolyte design, the interphase reconstruction strategies focus on solvent molecule manipulation, solute ion manipulation, and the regulation of solvation-ion interaction. By summarizing strategies for constructing a stable CEI on the cathode, this review aims to provide new insights into achieving high-voltage sodium-ion batteries.