HIGH-VOLTAGE NON-AQUEOUS ELECTROLYTE SOLUTION AND HIGH-VOLTAGE NON-AQUEOUS ELECTROLYTE SOLUTION SECONDARY BATTERY

摘要

A high-voltage non-aqueous electrolyte solution and a high-voltage non-aqueous electrolyte solution secondary battery. The high-voltage non-aqueous electrolyte solution comprises a lithium salt and, dissolving the lithium salt, a non-aqueous solvent and an additive; the additive is selected from at least one of the compounds as represented by formula (I), where: R1 is F, a C1-C8 alkyl group, a C1-C8 fluoroalkyl group or a C1-C8 fluoroalkoxy group, and R2 is a C1-C8 fluoroalkyl group or a C1-C8 fluoroalkoxy group. The high-voltage non-aqueous electrolyte solution secondary battery can form on a positive electrode surface thereof a protective layer by being charged initially to a high voltage such as 5.1 V, thus increasing the use performance of the high-voltage non-aqueous electrolyte solution secondary battery. The secondary battery has a charging cut-off voltage of 4.7 to 4.9 V, a high operating voltage platform, a high energy density, a low cycle capacity fade, a high charging/discharging coulomb efficiency, a great performance in withstanding high temperatures, and a wide range of applications.