| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery capable of increasing discharge capacity and energy density, and a method for manufacturing the lithium ion secondary battery.SOLUTION: A lithium ion secondary battery includes a positive electrode, a negative electrode, and an electrolyte provided between the positive electrode and the negative electrode. The positive electrode includes a positive electrode current collector and a positive electrode active material layer provided over the positive electrode current collector. The positive electrode active material layer includes a plurality of lithium-containing composite oxides each of which is expressed by general formula: LiMPO(M is one or more of Fe (II), Mn (II), Co (II), and Ni (II)). The lithium-containing composite oxide is a single crystal particle with a flat shape in which the length in the b-axis direction is shorter than each of the lengths in the a-axis direction and the c-axis direction. The lithium-containing composite oxide is provided over the positive electrode current collector so that the b-axis direction of the single crystal particle intersects with the surface of the positive electrode current collector.SELECTED DRAWING: Figure 1 |
