LITHIUM ION SECONDARY BATTERY AND METHOD OF MANUFACTURING LITHIUM ION SECONDARY BATTERY

• Main Authors: YASUDA TAKENORI, UCHIDA HARUAKI
• Format: Patent
• Language: English; Japanese
• Published: 16.04.2020
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To simplify the constitution of a thin film type lithium ion secondary battery comprising a solid electrolyte.SOLUTION: A lithium ion secondary battery 100 comprises: a battery part 1 formed by laminating, on a substrate 10 having conductivity and serving as a positive electrode collector layer, a ground layer 20, a positive electrode layer 30, a solid electrolyte layer 40, a holding layer 50, a diffusion preventive layer 60, and a negative electrode collector layer 70; and a covering part 2 having insulation properties and covering a side part of the battery part 1. The covering part 2 covers neither a center part of an upper surface of the negative electrode collector layer 70 located in the upper part of the battery part 1 nor a back surface of the substrate 10 located in the lower part of the battery part 1, and those uncovered part are used for electric connections with the outside.SELECTED DRAWING: Figure 4 【課題】固体電解質を備える薄膜型のリチウムイオン二次電池の構成の簡易化を図る。【解決手段】リチウムイオン二次電池１００は、導電性を有し且つ正極集電体層を兼ねる基板１０に、下地層２０、正極層３０、固体電解質層４０、保持層５０、拡散防止層６０および負極集電体層７０を積層してなる電池部１と、絶縁性を有し電池部１の側部を被覆する被覆部２とを備える。被覆部２は、電池部１の上方側に位置する負極集電体層７０の上面の中央部と、電池部１の下方側に位置する基板１０の裏面とを覆わないようになっており、これらは、外部との電気的な接続に用いられる。【選択図】図４