Patent ID: 8753769
Filing Date: 2014-06-17
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
1. A method for manufacturing a lithium ion secondary battery comprising a nonaqueous electrolyte solution that contains a lithium salt in which fluorine is a constituent element and a battery container, said method comprising the steps of: preparing an electrode assembly having positive and negative electrode sheets; preparing a voltage-application cathode plate and a voltage-application anode plate; immersing the electrode assembly into a nonaqueous liquid containing the lithium salt and a nonaqueous solvent; taking out the electrode assembly from the nonaqueous liquid; applying a voltage of at least 2 V to the nonaqueous liquid used in the immersion treatment by applying the voltage between the voltage-application cathode plate and the voltage-application anode plate inserted in the nonaqueous liquid, said voltage application treatment is conducted in a processing container which is different from the battery container and in the absence of the electrode assembly; separating the nonaqueous liquid from the voltage-application cathode plate and the voltage-application anode plate after the voltage application treatment; and placing the nonaqueous electrolyte solution obtained using the nonaqueous liquid after the voltage application treatment in the battery container along with the electrode assembly.