NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND METHOD FOR MANUFACTURING THE SAME

• Main Authors: OSAWA RYOSUKE, TSUJIKO AKIRA, INOUE KAORU
• Format: Patent
• Language: English; Japanese
• Published: 06.06.2019
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To enhance the cycle characteristics of a nonaqueous electrolyte secondary battery which includes silicon-containing particles and graphite particles as a negative electrode active material.SOLUTION: A nonaqueous electrolyte secondary battery comprises at least, a negative electrode 20, a positive electrode and an electrolyte solution. The electrolyte solution contains at least one kind selected from the group consisting of ethylene carbonate, fluoroethylene carbonate and vinylene carbonate. The negative electrode 20 includes at least a negative electrode mixture layer 22. The negative electrode mixture layer 22 includes, at least, silicon-containing particles 1 and graphite particles 2. In a log differential pore volume distribution of the negative electrode mixture layer 22, a ratio of a log differential pore volume when the pore diameter is 2 μm to a log differential pore volume when the pore diameter is 0.2 μm is 10.5 or more and 33.1 or less.SELECTED DRAWING: Figure 2 【課題】珪素含有粒子および黒鉛粒子を負極活物質として含む非水電解質二次電池のサイクル特性を向上させること。【解決手段】非水電解質二次電池は、負極２０、正極および電解液を少なくとも含む。電解液は、エチレンカーボネート、フルオロエチレンカーボネートおよびビニレンカーボネートからなる群より選択される少なくとも１種を含む。負極２０は負極合材層２２を少なくとも含む。負極合材層２２は珪素含有粒子１および黒鉛粒子２を少なくとも含む。負極合材層２２のＬｏｇ微分細孔容積分布において、細孔直径が０．２μｍであるときのＬｏｇ微分細孔容積に対する、細孔直径が２μｍであるときのＬｏｇ微分細孔容積の比が、１０．５以上３３．１以下である。【選択図】図２