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

The present invention provides a titanic acid compound-type electrode active material having a high battery capacity and excellent cycle characteristics. The titanic acid compound exhibited an X-ray diffraction pattern corresponding to the X-ray diffraction pattern of the bronze-type titanium dioxide except for the peaks of the (003) plane and the (-601) plane, The lattice spacing between faces, d ₍₀₀₃₎ -d _(-601), is less than 0.0040 nm. The titanic acid compound has a composition represented by a composition formula M _x M ' _{x/ 3} Ti _{2-x / 3} O ₄ (wherein M and M' represent an alkali metal and may be the same or different, and x ranges from 0.50 to 1.0) Reacting the indicated layered alkali metal titanate with an acidic compound and then heating the reaction product at a temperature in the range of 250 to 450 ° C.