Mitsubishi Heavy Industries Limited

Other

Sumitomo Chemical Company, Limited

Kyushu University

Chulalongkorn University

Toshiyasu Kiyabu

Shigeto Okada

Kenji Nakane

Jun-ichi Yamaki

Akihiko Yano

Jun-Ichi Yamaki

Irina D Gocheva

Ikumi Watanabe

Manabu Nishijima

Takayuki Doi

Yoshinori Noguchi

Soorathep Kheawhom

An oil deterioration detection device performs an analysis based on impedances at at least three first specific frequencies selected from a first frequency range to calculate an arc of impedance on a Nyquist diagram, the impedances being measured by applying an AC voltage at the at least three first specific frequencies to counter electrodes when oil to be evaluated passes between the counter electrodes, and when the calculated arc is larger than a reference arc calculated in advance of the oil to be evaluated by a predetermined value or larger, determines that moisture is mixed and calculates the amount of moisture based on the shape of the calculated arc.

Oil deterioration detection device, oil deterioration detection system, and oil deterioration detection method

In a non-aqueous electrolyte secondary battery, in order to adjust a cathode active material in which guest cation such as Na and Li is included, alkaline metal fluoride which is expressed by a general formula AF and transition metal fluoride which is expressed by a formula M' Fare subjected to a mechanical milling process to produce metal fluoride compound AM&#x2032; F. The mechanical milling process desirably uses a planetary ball mill.

Cathode active material for non-aqueous electrolyte secondary battery and manufacturing method of the same

A positive electrode active material for a non-aqueous electrode secondary cell which comprises a composite oxide containing iron and sodium as main components, having a hexagonal crystal structure, and exhibiting a value obtained by dividing the intensity of a peak corresponding to an interplanar spacing of 2.20 &#x212b; by the intensity of a peak corresponding to an interplanar spacing of 5.36 &#x212b; of 2 or less in the X-ray diffraction analysis of said composite oxide; and a method for preparing the positive electrode active material wherein the above composite oxide is prepared by heating a metal compound mixture mainly containing a sodium compound and an iron compound in the temperature range of 400 to 900&#xb0; C., which comprises heating the metal compound mixture in an inert atmosphere in the temperature range of less than 100&#xb0; C. on the way of the rise in the temperature. The use of the above active material allows the manufacture of a cell which is free from the rapid reduction of the discharge voltage with the progress of discharge.

Positive electrode active material for non-aqueous electrolyte secondary cell

Growing community of inventors

Nagasaki-ken, Japan

Toshiyasu Kiyabu