公开(公告)号：US20170141428A1

公开(公告)日：2017-05-18

申请号：US15346932

申请日：2016-11-09

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Ai NAKAGAWA ,  Teppei OGUNI ,  Kai KIMURA ,  Rika YATABE

IPC: H01M10/0525 ,  H01M4/36 ,  H01M4/66 ,  H01M10/04 ,  H01M4/133 ,  H01M10/058 ,  H01M4/136 ,  H01M4/58 ,  H01M10/0567 ,  H01M4/587

CPC classification number: H01M10/0525 ,  G01R31/36 ,  H01M4/133 ,  H01M4/136 ,  H01M4/366 ,  H01M4/5825 ,  H01M4/587 ,  H01M4/62 ,  H01M4/626 ,  H01M4/661 ,  H01M10/0422 ,  H01M10/0463 ,  H01M10/0567 ,  H01M10/0568 ,  H01M10/0569 ,  H01M10/058 ,  H01M10/425 ,  H01M2010/4271 ,  H01M2220/30 ,  H01M2300/0025 ,  H01M2300/0037 ,  H02J7/0014

Abstract: A lithium-ion secondary battery with a high capacity retention rate is provided. In addition, a fabricating method of a lithium-ion secondary battery with a high capacity retention rate is provided. The lithium-ion secondary battery includes a positive electrode, a negative electrode, and an electrolyte solution. The negative electrode includes a negative electrode active material layer. The electrolyte solution includes at least one of lithium bis(trifluoromethanesulfonyl)amide (LiTFSA) and lithium bis(fluorosulfonyl)amide (LiFSA). The electrolyte solution includes vinylene carbonate (VC). A coating film including lithium oxide is on a surface of the negative electrode active material layer. A fabricating method of a lithium-ion secondary battery includes a first step of enclosing a positive electrode, a negative electrode, and an electrolyte solution in an exterior body, and a second step of annealing the exterior body enclosing the positive electrode, the negative electrode, and the electrolyte solution for 24 hours or longer after the first step. The annealing in the second step is performed at a temperature higher than or equal to 80° C. and lower than or equal to 100° C.