Titanic Acid Compound, Process For Producing The Titanic Acid Compound, Electrode Active Material Containing The Titanic Acid Compound, And Storage Device Using The Electrode Active Material

摘要

This invention provides a titanic acid compound-type electrode active material having a high battery capacity and, at the same time, having excellent cycle characteristics. The titanic acid compound exhibits an X-ray diffraction pattern corresponding to a bronze-type titanium dioxide except for a peak for a (200) plane and having a peak intensity ratio between the (001) plane and the (200) plane, i.e., I_(200)/I(001), of not more than 0.2. The titanic acid compound may be produced by heat dehydrating H₂Ti₃O₇ at a temperature in the range of 200 to 330° C., by heat dehydrating H₂Ti₄O₉ at a temperature in the range of 250 to 650° C., or by heat dehydrating H₂Ti₅O₁₁ at a temperature in the range of 200 to 600° C.