Patent attributes
According to one embodiment, a secondary battery including a positive electrode, a negative electrode, an insulating layer, and a nonaqueous electrolyte is provided. The positive electrode includes a positive electrode active material-containing layer containing a lithium nickel cobalt manganese composite oxide. The negative electrode includes a negative electrode active material-containing layer having a first surface. The insulating layer includes a solid electrolyte layer having a second surface that is at least partly opposed to or partly in contact with the first surface and containing a Li ion conductive oxide. At least part of the second surface or the first and second surfaces includes a Mn-containing substance. An abundance ratio of Mn on the second surface is higher than that on the first surface.
