Sanyo Electric Co., Ltd.

Koh Masahara

Hiroshi Nonoue

Masahisa Fujimoto

Katsunori Yanagida

Kenichiro Wakisaka

A lithium ion secondary battery including a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, and a nonaqueous electrolyte. The positive electrode active material is a lithium transition metal oxide that contains niobium and is represented by xLi[LiMnNb]O&#xb7;(1&#x2212;x)LiMNbO(0&#x3c;x&#x3c;1, 0&#x3c;xq+(1&#x2212;x)r&#x2266;0.3, 0&#x2266;q&#x2266;0.3, 0&#x2266;r&#x2266;0.3, and M: at least one element selected from the group consisting of nickel, cobalt, and manganese). During initial charging, oxygen desorbs from the positive electrode active material.

Lithium ion secondary battery

A dielectric ceramic obtained by firing a raw material comprising an alumina powder, a crystallizable glass powder mainly containing SiO, CaO and MgO, and a noncrystallizable glass powder mainly containing SiO, BOand NaO. After the firing, the dielectric ceramic contains an alumina crystal phase, a diopside crystal phase (Ca(Mg, Al)(Si, Al)O) and a magnesia-spinel crystal phase (MgAlO) and has a porosity of not higher than 2.2% when measured by a mercury penetration method.

Dielectric ceramic and multilayer ceramic substrate

A dielectric ceramic material which is obtained by firing a raw material comprising an alumina powder and a glass powder containing at least SiOand MgO, the dielectric ceramic material being characterized in that a ratio (MgAlO(311)/AlO(116)) in X-ray diffraction peak intensity of an MgAlO(311) to an AlO(116) is at least 0.5.

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Osaka, Japan

Koh Masahara