Prime Planet Energy & Solutions, Inc.

Kaijo Corporation

Hikaru Yoshida

Shigeki Matsuta

Mizuho Shiroto

Atsushi Obayashi

A slurry is prepared by mixing active material particles, capsule-shaped particles, a binder, and an organic solvent. The slurry is applied to a surface of a substrate to form a coating film. The coating film is heated to dry to form an active material layer. The active material layer is compressed to produce an electrode. Each of the capsule-shaped particles includes a thermoplastic resin. The thermoplastic resin softens when heated in the presence of the organic solvent. When the thermoplastic resin softens, the capsule-shaped particles shrink to form voids in the active material layer.

Method of producing electrode, method of producing battery, electrode, and battery

A non-aqueous electrolyte secondary battery comprises a positive electrode, a negative electrode, a separator, and an electrolyte solution. At least part of the separator is interposed between the positive electrode and the negative electrode. The negative electrode includes a negative electrode substrate and a negative electrode active material layer. The negative electrode active material layer is placed on a surface of the negative electrode substrate. Voids are formed in the negative electrode active material layer. In a cross section parallel to a thickness direction of the negative electrode active material layer, the voids have an average equivalent circle diameter from 9.6 μm to 35.8 μm, an average circularity of 0.26 or more, and an area percentage from 3.1% to 30.9%.

Non-aqueous electrolyte secondary battery

To provide a wire bonding method and a wire bonding device capable of stably forming a free air ball having a large ball diameter while suppressing oxidation of the free air ball, in addition to supply of an oxidation prevention gas from gas supply means () into an insertion portion (), an oxidation prevention gas is supplied from a gas supply nozzle (), which is arranged outside the insertion portion (), so as to cover an inlet of the insertion portion (). Under a state in which a leading end of a wire () is positioned inside the insertion portion (), and in which a leading end of a capillary () is positioned outside the insertion portion (), spark discharge is generated. With this, a free air ball () having a large ball diameter can be formed while suppressing oxidation of the free air ball () and stabilizing the free air ball ().

Growing community of inventors

Ibaraki, Japan

Hikaru Yoshida