Lithium-ion secondary battery, vehicle, electronic device and manufacturing method of lithium-ion secondary battery

A manufacturing method of a lithium-ion secondary battery, comprising:

• a first step of forming a negative-electrode active material layer having a striped structure made up of a plurality of pattern elements containing Li4Ti5O12 as a negative-electrode active material and parallel to and spaced apart from each other on a surface of a base material which will become a negative-electrode current collector layer, so that the pattern elements form stripes of the striped structure;
• a second step of forming a solid electrolyte layer which is made of a solid electrolyte containing polyethylene oxide and polystyrene and covers both surfaces of the negative-electrode active material layer and exposed surfaces of the base material not covered by the negative-electrode active material layer;
• and
• a third step of laminating a positive-electrode active material layer containing LiCoO2 as a positive-electrode active material and a positive-electrode current collector layer on a surface of the solid electrolyte layer,
• wherein, in the first step, an angle at a side including the negative-electrode active material layer out of angles formed between the surface of the negative-electrode current collector layer and a tangent drawn to the negative-electrode active material layer at a contact point of each pattern element and the negative-electrode current collector layer is set smaller than 90°.