NEGATIVE ELECTRODE

• Main Authors: OSAWA RYOSUKE, TSUJIKO AKIRA, TANIGUCHI AKIHIRO, INOUE KAORU
• Format: Patent
• Language: English; Japanese
• Published: 04.06.2020
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To improve Li acceptability while suppressing a reduction of a cycle characteristic at a negative electrode including a graphite material and a silicon material.SOLUTION: A negative electrode active material layer 220 includes a first layer 221 and a second layer 222. The second layer 222 is laminated on the first layer 221. The second layer 222 includes a second main surface S2. The first layer 221 includes a first negative electrode active material and a first conductive material. The first negative electrode active material includes a graphite material and a silicon material. The first conductive material includes a carbon nano-tube. The first conductive material is included in a range from 0.3 pts.mass to 0.7 pts.mass inclusive with respect to 100 pts.mass of the first negative electrode active material. The second layer 222 includes a second negative electrode active material and a second conductive material. The second negative electrode active material includes a graphite material. The second conductive material is included in a range from 0.05 pts.mass to 0.15 pts.mass inclusive with respect to 100 pts.mass of the second negative electrode active material.SELECTED DRAWING: Figure 1 【課題】黒鉛材料および珪素材料を含む負極において、サイクル特性の低下を抑制しつつ、Ｌｉ受入性を向上させること。【解決手段】負極活物質層２２０は第１層２２１および第２層２２２を含む。第２層２２２は第１層２２１に積層されている。第２層２２２は第２主面Ｓ２を含む。第１層２２１は第１負極活物質および第１導電材を含む。第１負極活物質は黒鉛材料および珪素材料を含む。第１導電材はカーボンナノチューブを含む。第１導電材は、１００質量部の第１負極活物質に対して、０．３質量部以上０．７質量部以下含まれている。第２層２２２は第２負極活物質および第２導電材を含む。第２負極活物質は黒鉛材料を含む。第２導電材は、１００質量部の第２負極活物質に対して、０．０５質量部以上０．１５質量部以下含まれている。【選択図】図１