Mitsubishi Materials Corporation

Akihiro Higami

Yusuke Watarai

Akio Minakuchi

Tadashi Kobayashi

Sawako Takeuchi

Kazuhiko Yamasaki

Shoubin Zhang

Tomohiko Yamaguchi

Koutarou Masuyama

A metal particle aggregate includes metal particles and an organic substance. The metal particles include first particles that contain one or both of silver and copper in an amount of 70% by mass or more relative to 100% by mass of all metals and have a particle diameter of 100 nm or more and less than 500 nm at a ratio of 20 to 30% by number, and include second particles that have a particle diameter of 50 nm or more and less than 100 nm, and third particles that have a particle diameter of less than 50 nm at a ratio of 80 to 70% by number in total. Surfaces of the first to third particles are covered with the same protective film.

Metal particle aggregates, method for producing same, paste-like metal particle aggregate composition, and method for producing bonded body using said paste-like metal particle aggregate composition

The present invention provides a lithium ion polymer battery comprising an electrode having excellent adhesion and electrical conductivity between a current collector and an active material layer, cycle capacity maintaining characteristics being improved, wherein a bonding layer, which bonds the current collector to the active material layer, is stable to an organic solvent in an electrolytic solution and is excellent in storage stability, and also, it is made possible to suppress the corrosion of the current collector by a strong acid such as hydrofluoric acid generated in the battery.

Lithium ion polymer secondary battery its electrode and method for synthesizing polymer compound in binder used in adhesion layer thereof

A lithium ion polymer secondary battery is a laminate of a positive-electrode sheet of a positive-electrode collector foil provided with an active material thereon, a negative-electrode sheet of a negative-electrode collector foil provided with another active material thereon, and a polymer electrolyte layer interposed between the positive-electrode sheet and the negative-electrode sheet. One of the positive-electrode sheet and the negative-electrode sheet is a strip and is fan-folded at least one time so that the positive-electrode sheet is provided on the surface of the active material on the sheet. The other one of the positive-electrode sheet and the negative-electrode sheet consists of a plurality of sheet segments having an area which is the same as the area of each flat portion of the fan-folded sheet. The sheet segments are interposed between the flat portions of the fan-folded sheet so that the polymer electrolyte layer is in contact with the surfaces of the active materials. The battery exhibits a large discharge capacity and improved discharge capacity characteristics after a number of discharge-charge cycles and does not cause internal short-circuiting.

Lithium ion polymer secondary battery and gelatinous polymer electrolyte for sheet battery

Growing community of inventors

Naka-gun, Japan

Akihiro Higami