Shin-etsu Chemical Co., Ltd.

Mitsugu Saito

Tetsuya Inukai

Susumu Ueno

Hirofumi Fukuoka

Masanao Kamei

Hiroyuki Moriya

Chihiro Hayakawa

Ryuichi Inaba

Hiroko Kikuchi

Tomoki Okawa

The present invention addresses the problem of evaluating the hydrophobicity of a powder. According to the present invention, a powder is charged into a mixed solvent composed of a lipophilic solvent and a hydrophilic solvent, the voltage rate R of the mixed solvent is measured at predetermined time intervals while adding a lipophilic solvent to the mixed solvent charged with the powder, a parameter x correlating with the concentration of powder is defined for an arbitrary voltage rate R, a continuous function HP(x) of the ratio of a lipophilic solvent corresponding to x is defined, and HP(x) for required x is set as a representative value of a lipophilic solvent ratio distribution and used as an index of hydrophobicity.

Method for analyzing degree of hydrophobicity of powder, highly hydrophobized coloring pigment, and cosmetic containing said coloring pigment

A silicon oxide material having a cobalt content of 2-200 ppm is provided. A negative electrode is formed using the silicon oxide material as active material. A nonaqueous electrolyte secondary battery constructed using the negative electrode exhibits improved cycle performance while maintaining the high battery capacity and low volume expansion of silicon oxide.

Silicon oxide material, making method, negative electrode, lithium ion secondary battery, and electrochemical capacitor

Particulate silicon oxide having a Cu content of 100-20,000 ppm, an Fe content of 20-1,000 ppm, an Al content of up to 1,000 ppm, an average particle size of 0.1-30 &#x3bc;m, and a BET specific surface area of 0.5-30 m/g is used as negative electrode material in constructing a nonaqueous electrolyte secondary battery. The secondary battery is improved in cycle performance while maintaining the high battery capacity and low volume expansion of silicon oxide.

Silicon oxide, making method, negative electrode, lithium ion secondary battery, and electrochemical capacitor

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Annaka, Japan

Mitsugu Saito