Showa Denko K.k.

Showa Denko Kabushiki Kaisha

Hideo Yashima

Masataka Takeuchi

Koji Tokita

Jun Noguchi

Miyuki Ueda

Kazuhiko Ooga

Eri Tamura

Hiroshi Ohsawa

Shin-ichi Ogawa

A solid polymer electrolyte comprising a composite of (a) a polymeric component which comprises (i) a polymer obtained from at least one compound represented by general formula (IA), (IIA) and/or (IIIA) as described in the specification; or (ii) a polymer obtained from at least one compound having alcoholic hydroxyl groups wherein at least one hydrogen atom of said alcoholic hydroxyl groups is replaced by a unit represented by general formula (X) or (XI) as described in the specification, and (b) at least one electrolyte salt, which has a high ionic conductivity and can be made into a thin film. The present invention is also directed to an electrode comprising the solid polymer electrolyte and an electroactive substance or polarizable material; as well as a process for manufacturing the same. In addition, the present invention is directed to a primary an secondary battery having the solid polymer electrolyte, as well as a process for manufacturing the same. The battery of the present invention has a high capacity, high current density, and, in the case of a secondary battery, has good cyclability. Finally, the present invention is directed to a solid-state electric double layer capacitor comprising the solid polymer electrolyte, as well as a process for manufacturing the same. The electric double layer capacitor has a high output voltage and a large take-out current.

Solid polymer electrolyte, battery and solid-state electric double layer

A solid polymer electrolyte comprising a composite of (a) a polymeric component which comprises (i) a polymer obtained from at least one compound represented by general formula (IA), (IIA) and/or (IIIA) as described in the specification; or (ii) a polymer obtained from at least one compound having alcoholic hydroxyl groups wherein at least one hydrogen atom of said alcoholic hydroxyl groups is replaced by a unit represented by general formula (X) or (XI) as described in the specification, and (b) at least one electrolyte salt, which has a high ionic conductivity and can be made into a thin film. The present invention is also directed to an electrode comprising the solid polymer electrolyte and an electroactive substance or polarizable material; as well as a process for manufacturing the same. In addition, the present invention is directed to a primary and secondary battery having the solid polymer electrolyte, as well as a process for manufacturing the same. The battery of the present invention has a high battery, has good cyclability. Finally, the present invention is directed to a solid-state electric double layer capacitor comprising the solid polymer electrolyte, as well as a process for manufacturing the same. The electric double layer capacitor has a high output voltage and a large take-out current.

A magnetic recording medium having an improved CSS characteristics is made by a process including a surface texture treatment step of either (1) focusing an ultraviolet laser beam in a ring-shaped band, or (2) focusing a pulsed ultraviolet laser beam at an energy density of at least 0.01 J/cm.sup.2 but lower than the threshold level successively at least two times but up to 1,000 times, on a substrate composed of glass or silicon, followed by the formation of an undercoat, a magnetic layer, and a protective coating in this order on the surface-textured substrate.

Process for producing magnetic recording medium

Growing community of inventors

Ichihara, Japan

Hideo Yashima