| abstract |
The present invention provides a battery capable of obtaining high energy density and attaining excellent cycle characteristics.n n n In addition, the thickness of the positive electrode active material layer 21B of the present invention is 100 µm or more and 130 µm or less, the thickness of the negative electrode active material layer 22B is 85 µm or more and 120 µm or less, and the bulk density is 1.7 g / cm 3 or more and 1.85. g / cm 3 or less. The electrolyte solution contains 4-fluoro-1,3-dioxolan-2-one. Thereby, even if the thickness of the positive electrode active material layer 21B and the thickness of the negative electrode active material layer 22B are thickened, the diffusion and introduction of lithium in the negative electrode 22 is improved, and excellent cycle characteristics can be obtained. |