LITHIUM ION SECONDARY BATTERY

• Main Author: KAMIYA MASATO
• Format: Patent
• Language: English; Japanese
• Published: 28.05.2024
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a lithium ion secondary battery which can easily determine the presence/absence of a content of a metal impurity using an insulation inspection test in the lithium ion secondary battery having a groove in at least one of a positive electrode active material layer and a negative electrode active material layer.SOLUTION: A lithium ion secondary battery comprises an electrode body laminating a positive electrode that has a positive electrode active material layer and a positive electrode collector body, and a negative electrode having a negative electrode active material layer and a negative electrode collector body via a separator with a conductive layer. The positive electrode active material layer and the negative electrode active material layer are contacted to the separator, at least one of the positive electrode active material layer and the negative electrode active material layer includes a groove in a thickness direction. On a front surface of the separator faced to the front surface having the groove of at least one of the positive electrode active material layer and the negative electrode active material layer, the conductive layer is provided.SELECTED DRAWING: Figure 1 【課題】正極活物質層及び負極活物質層の少なくとも一方に溝を有するリチウムイオン二次電池において、絶縁検査試験を使用した金属不純物の含有の有無の判断が容易であるリチウムイオン二次電池の提供。【解決手段】正極活物質層及び正極集電体を有する正極及び負極活物質層並びに負極集電体を有する負極が導電層を有するセパレータを介して積層している電極体を備え、前記正極活物質層及び前記負極活物質層が前記セパレータと接触し、前記正極活物質層及び前記負極活物質層の少なくとも一方が厚さ方向に溝を有し、前記正極活物質層及び前記負極活物質層の少なくとも一方の前記溝を有する表面と向き合う前記セパレータの表面に前記導電層を有するリチウムイオン二次電池。【選択図】図１