1. Select solvents with high oxidation potential and wide electrochemical window (such as sulfones, nitriles and fluorinated solvents).
2. Some positive electrode protection additives can be added to the electrolyte to improve the interfacial properties of the positive electrode material.
3. Add a positive electrode film-forming additive to the electrolyte to suppress the reaction between the electrolyte and the positive electrode material interface.
4. Add novel high-voltage resistant lithium salts as additives to the electrolyte. For example, adding bis(oxalato)boronic acid (LiBOB) to the electrolyte can also form a film on the surface of the positive electrode material, preventing side reactions between the electrolyte and the electrode material.
High-voltage additives typically oxidize preferentially over solvent molecules during cycling, forming a passivation film on the positive electrode surface. This stabilizes the electrode/electrolyte interface, ultimately enabling the electrolyte to remain stable under high voltage. With technological advancements, the use of high-voltage lithium-ion batteries is undoubtedly the future trend.
Electrolytes are crucial; they are often referred to as the lifeblood of ion batteries. On one hand, electrolytes act as a bridge connecting the positive and negative electrodes; on the other hand, they serve as a medium for ion migration and transfer. To develop high-voltage electrolyte systems, additives are essential. Some additives can utilize competitive ions, introducing ions and lithium ions to compete for solvation, thereby altering the solvation structure of the electrolyte.
