Lithium electrolytes are conductive media that facilitate the movement of lithium ions between the cathode and anode in lithium-ion batteries. They are usually composed of lithium salts dissolved in organic solvents or solid polymers and play a crucial role in determining battery performance. Lithium electrolytes must have high ionic conductivity, good chemical and electrochemical stability, and low flammability to ensure safe and efficient battery operation. Advances in lithium electrolyte materials, such as the development of solid-state electrolytes, are driving the advancement of next-generation battery technology. The properties and composition of lithium electrolytes are carefully tailored to meet the specific requirements of different battery applications, such as electric vehicles, consumer electronics, and energy storage systems.