POSITIVE ELECTRODE AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

• Main Authors: HIRATSUKA HIDEKAZU, TERAUCHI MASUMI, KURAMOTO MAMORU, WATANABE YUKI
• Format: Patent
• Language: English; Japanese
• Published: 03.10.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To ensure both packing characteristic and resistivity of a positive electrode active material layer.SOLUTION: A positive electrode 10 is used for a nonaqueous electrolyte secondary battery. The positive electrode 10 includes a positive electrode substrate 11 and a positive electrode active material layer 12. The positive electrode active material layer 12 is disposed on a surface of the positive electrode substrate 11. The positive electrode active material layer 12 includes a first layer 1 and a second layer 2. The second layer 2 is disposed between the positive electrode substrate 11 and the first layer 1. The first layer 1 includes a first positive electrode active material. The first positive electrode active material includes first aggregated particles mc1. The second layer 2 includes a second positive electrode active material.The second positive electrode active material includes second aggregated particles mc2 and single-particles sc2. Each of the first aggregated particles mc1 and the second aggregated particles mc2 is formed by aggregation of 50 or more primary particles. The single-particles sc2 have an arithmetic mean diameter larger than the primary particles.SELECTED DRAWING: Figure 3 【課題】正極活物質層の充填性と抵抗率とを両立する。【解決手段】正極１０は非水電解質二次電池に使用される。正極１０は正極基材１１と正極活物質層１２とを含む。正極活物質層１２は、正極基材１１の表面に配置されている。正極活物質層１２は第１層１と第２層２とを含む。第２層２は、正極基材１１と第１層１との間に配置されている。第１層１は第１正極活物質を含む。第１正極活物質は第１凝集粒子ｍｃ１を含む。第２層２は第２正極活物質を含む。第２正極活物質は第２凝集粒子ｍｃ２と単粒子ｓｃ２とを含む。第１凝集粒子ｍｃ１および第２凝集粒子ｍｃ２の各々は、５０個以上の一次粒子が凝集することにより形成されている。単粒子ｓｃ２は、一次粒子に比して大きい算術平均径を有する。【選択図】図３