| abstract |
According to one approach, there is provided a secondary battery (100) including a negative electrode active material-containing layer (3b), a positive electrode active material-containing layer (5b), and an electrical insulation layer (4). The electrical insulation layer (4) is provided between the negative electrode active material-containing layer (3b) and the positive electrode active material-containing layer (5b) and contains electrically insulating particles. The particle size distribution of the electrically insulating particles includes at least two peaks. |