| abstract |
The present invention provides a method for manufacturing a lithium ion secondary battery that can reduce cell expansion caused by a negative electrode active material layer storing lithium ions. [1] A method of manufacturing a lithium ion secondary battery 1 including a cell having a negative electrode 4 having a negative electrode active material layer 3 and a positive electrode 7, wherein the negative electrode active material layer has a volume density of 0. after adjusting below .8g / cm 3 or more 1.5 g / cm 3, the production of lithium ion secondary battery having a pre-doping step for lithium pre-doping, and a charging step of performing initial charging while pressurizing the cell Method. [2] The said manufacturing method which performs lithium pre dope in the said pre dope process, pressurizing the said cell. [3] The manufacturing method of pressurizing the cell at a pressure of 0.3 kg / cm 2 or more 6.6 kg / cm 2. [4] In the charging step, the manufacturing method of pressurizing the cell at a pressure of 0.3 kg / cm 2 or more 6.6 kg / cm 2. [Selection figure] None |