Nippon Steel Chemical Co., Ltd.

Hideki Ono

Yoichi Kawano

Taisa Ikeda

Kazuki Tagawa

Keiichi Hayashi

Hiroshi Ono

Koji Hirashima

Toshihisa Fujitaka

Keiji Taura

Ryoji Akamine

A negative electrode active material of lithium secondary battery includes: at least one of a petroleum-derived green coke and a coal-derived green coke, and at least one of a petroleum-derived calcined coke and a coal-derived calcined coke within a mass ratio range of 90:10 to 10:90, and a phosphorous compound within a range of 0.1 to 6.0 parts by mass in amount equivalent to phosphor relative to 100 parts by mass of the at least one of the green cokes and the at least one of the calcined cokes.

Negative electrode active material of lithium secondary battery, secondary battery using the same, method for manufacturing the same

This invention relates to a method for removing unreacted monomers and other volatile matters from a polymer solution composition produced from a mixture containing an aromatic vinyl monomer, utilizes two or more flash devolatilizing vessels, and effects the removal by adjusting the solid content of the polymer solution composition at the outlet of the devolitilizer before the last-stage devolitilizer to a level in excess of 97%, adding 0.5-4 parts by weight of a foaming agent to the total polymer solution composition, passing the polymer solution composition through the last-stage devolitilizer while maintaining the pressure of the polymer solution at 10 kg/cm or more by means of a pressure controller and the temperature in the range 190-260&deg; C., introducing the polymer solution composition to a vapor-liquid separation vessel maintained at a vacuum of 20 Torr or less, and allowing the composition to foam.

Method for removing volatile matter from polymer solution composition

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Kitakyushu, Japan

Hideki Ono