abstract |
Provided is a battery capable of improving energy density and improving battery characteristics such as cycle characteristics or high-temperature storage characteristics. A positive electrode 21 and a negative electrode 22 are arranged to face each other with a separator 23 interposed therebetween. The open circuit voltage during full charge is in the range of 4.25V to 6.00V. The separator 23 has a base material layer 23A and a surface layer 23B, and the surface layer 23B facing the positive electrode 21 is at least one of the group consisting of polyvinylidene fluoride, polytetrafluoroethylene, polypropylene, and aramid. It is formed by seeds. [Selection] Figure 2 |