| abstract |
A lithium ion secondary battery having a high capacity retention ratio is provided. A lithium ion battery with a long service life is provided. A method of manufacturing a lithium ion secondary battery having a high capacity retention ratio is provided. A lithium ion battery comprising: a cathode; a cathode; and an electrolyte. Among them, the surface of the negative electrode has a coating film, and the coating film contains lithium oxide. The electrolyte may contain LiTFSA or LiFSA. A method for manufacturing a lithium ion secondary battery, comprising the steps of: sealing a positive electrode, a negative electrode and an electrolyte into a first process of the outer package; after the first process, maintaining the positive electrode, the negative electrode and the electrolyte at a temperature above 70 ° C The second process of packaging for more than 24 hours. |