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AssigneeTaiyo Yuden Co., Ltd.
InventorsChie KAWAMURA, Masaki MOCHIGI, Daigo ITO, Akitoshi WAGAWA, Yoichiro OGATA, Toshiyuki OCHIAI, Isao TAKAHASHI, Toshimasa SUZUKI
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A ceramic material offering both high capacity and high rate characteristics includes, as a main constituent, titanium oxide, and 0.004 to 0.249 percent by mass of potassium, 0.013 to 0.240 percent by mass of phosphorous and 0.021 to 1.049 percent by mass of niobium, has a spinel structure, and preferably has a peak intensity measured on the Li27.84Ti36.816Nb1.344O90 (310) plane by powder X-ray diffraction corresponding to 3/10 of the peak intensity of the Li4Ti5O12 (111) plane or less, or preferably has a maximum primary particle size of 2 μm or less. The ceramic material is used in an electrode which is used in a lithium ion secondary battery.
A ceramic material whose main constituent is a lithium titanate having a spinel structure, containing 0.004 to 0.249 percent by mass of potassium, 0.013 to 0.240 percent by mass of phosphorous and 0.021 to 1.049 percent by mass of niobium.
A lithium ion secondary battery having:
A lithium-titanium complex oxide consisting essentially of a lithium titanate having a spinel structure, 0.004 to 0.249 percent by mass of potassium, 0.013 to 0.240 percent by mass of phosphorous, and 0.021 to 1.049 percent by mass of niobium.
Dependencies are inferred from the claim text.