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 H2Ti5O11at a temperature in the range of 200 to 600°C.