METHOD FOR MANUFACTURING LITHIUM SECONDARY BATTERY

摘要

Provided is a method for manufacturing a lithium secondary battery which is capable of preventing a local deposition of a metallic foreign substance at a negative electrode regardless of the type of a positive electrode and in which a short-circuit is less likely to occur. The present manufacturing method comprises: a step of assembling a cell that includes a positive electrode, a negative electrode, and a nonaqueous electrolyte; a micro charging step of performing a micro charge on the assembled cell before performing an initial conditioning charge until a positive electrode potential with respect to a metal lithium (Li) reference electrode exceeds an Me dissolution potential set in advance at which a mixing-anticipated metal species (Me) starts to dissolve; and an Me dissolution potential holding step of holding the positive electrode potential of the cell at or above the Me dissolution potential for a prescribed period of time after the micro charge.

主权项

1. A method for manufacturing a lithium secondary battery comprising a positive electrode including a positive electrode active material made of a lithium-containing complex oxide, a negative electrode including a negative electrode active material capable of storing and releasing lithium ions, and a nonaqueous electrolyte, the method comprising:
a step of assembling a cell that includes the positive electrode, the negative electrode, and the nonaqueous electrolyte; a micro charging step of performing a micro charge on the assembled cell at an amount of charge that is less than 0.01% of a capacity of the cell before performing an initial conditioning charge so that a positive electrode potential with respect to a metal lithium (Li) reference electrode exceeds an Me dissolution potential set in advance at which a mixing-anticipated metal species (Me) starts to dissolve; and an Me dissolution potential holding step of holding the positive electrode potential of the cell at or above the Me dissolution potential for a prescribed period of time after the micro charge, wherein in the Me dissolution potential holding step, dropping the positive electrode potential by self-discharge, and performing the micro charge before the positive electrode potential drops below the Me dissolution potential are performed in combination one or more times.