Showa Denko K.k.

Group14 Technologies, Inc.

Resonac Corporation

Akifumi Takeda

Yuji Ito

Takeshi Nakamura

Hirofumi Inoue

Hitoshi Yokouchi

Shunsuke Saito

Masato Fujita

An object of the present invention is to provide composite particles capable of suppressing oxidation over time of a Si—C composite material. Composite particles (B) of the present invention contains composite particles (A) containing carbon and silicon; and amorphous layers coating surfaces thereof, where the composite particles (B) have I/Iof 0.10 or more and 0.65 or less, and have R value (I/I) of 1.00 or more and 1.30 or less, when a peak due to silicon is present at 450 to 495 cm, an intensity of the peak is defined as I, an intensity of a G band (peak intensity in the vicinity of 1600 cm) is defined as I, and an intensity of a D band (peak intensity in the vicinity of 1360 cm) is defined as Iin a Raman spectrum, and where the composite particles (B) have a full width at half maximum of a peak of a 111 plane of Si of 3.0 deg. or more using a Cu-Kα ray in an XRD pattern.

Composite particles, negative electrode material, and lithium-ion secondary battery

A current collector for electrical storage device includes a sheet-shaped conductive substrate and a coating layer disposed on one or both sides of the conductive substrate. The coating layer includes a powdery carbon material, acid-modified polyvinylidene fluoride and polyvinylpyrrolidone. The content of the polyvinylpyrrolidone is 0.099 to 5.0 mass %. The content of the powdery carbon material in the coating layer is 15.0 to 45.0 mass %. Also disclosed is a coating liquid for producing the current collector for electrical storage device as well as a method for producing the current collector for electrical storage device.

Current collector for electrical storage device, method for producing the same, and coating liquid used in said production method

Growing community of inventors

Tokyo, Japan

Akifumi Takeda