LITHIUM ION BATTERY

• Main Authors: SATO HAJIME, HORIE HIDEAKI, AKAMA HIROSHI, KUSACHI TAKEKI, AZUMA KEIICHIRO, OSAWA YASUHIKO
• Format: Patent
• Language: English; Japanese
• Published: 05.12.2019
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a lithium ion battery capable of inhibiting reduction in a battery characteristic by improving charging performance into a frame body of at least one of a positive electrode active material layer and a negative electrode active material layer.SOLUTION: On surfaces of a sheet-like positive electrode collector and negative electrode collector are formed along their margins an annular positive electrode frame body and negative electrode frame body, respectively. On inner sides of the positive electrode frame body and negative electrode frame body are formed a positive electrode active material layer and negative electrode active material layer, respectively. The positive electrode active material layer is a non-binding body of positive electrode active material particles; the negative electrode active material layer is a non-binding body of negative electrode active material particles. An inner wall surface of the positive electrode frame body, the positive electrode frame body's side in contact with the positive electrode active material layer, is formed as a surface not orthogonal to a separator's first surface in contact with the positive electrode active material layer and/or an inner wall surface of the negative electrode frame body, the negative electrode frame body's side in contact with the negative electrode active material layer, is formed as a surface not orthogonal to the separator's second surface in contact with the negative electrode active material layer.SELECTED DRAWING: Figure 2 【課題】正極活物質層及び負極活物質層の少なくとも一方の枠体内への充填性を良好にすることで電池特性の低下を抑制することの可能なリチウムイオン電池を提供する。【解決手段】シート状の正極集電体及び負極集電体の表面にはその縁部に沿ってそれぞれ環状の正極枠体及び負極枠体が形成され、正極活物質層及び負極活物質層はそれぞれ正極枠体及び負極枠体の内側に形成され、正極活物質層は正極活物質粒子の非結着体であり、負極活物質層は負極活物質粒子の非結着体であり、正極活物質層に接する側である正極枠体の内壁面が、セパレータの正極活物質層に接する第一面に対して直交しない面に形成され、及び／または、負極活物質層に接する側である負極枠体の内壁面が、セパレータの負極活物質層に接する第二面に対して直交しない面に形成されている。【選択図】 図２