公开(公告)号：US20220181697A1

公开(公告)日：2022-06-09

申请号：US17676875

申请日：2022-02-22

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Kazuhei NARITA ,  Ryota TAJIMA ,  Teppei OGUNI, I

IPC: H01M10/0569 ,  H01G11/28 ,  H01G11/32 ,  H01G11/52 ,  H01G11/60 ,  H01G11/62 ,  H01G11/84 ,  H01G11/86 ,  H01M4/36 ,  H01M4/525 ,  H01M4/587 ,  H01M4/66 ,  H01M10/0525 ,  H01M10/0568 ,  H01M50/411 ,  H01M50/429 ,  H01M50/44 ,  G04G19/00

Abstract: To provide a power storage device whose charge and discharge characteristics are unlikely to be degraded by heat treatment. To provide a power storage device that is highly safe against heat treatment. The power storage device includes a positive electrode, a negative electrode, a separator, an electrolytic solution, and an exterior body. The separator is located between the positive electrode and the negative electrode. The separator contains polyphenylene sulfide or solvent-spun regenerated cellulosic fiber. The electrolytic solution contains a solute and two or more kinds of solvents. The solute contains LiBETA. One of the solvents is propylene carbonate.