TITANATE COMPOUND, ALKALI METAL TITANATE COMPOUND AND METHOD FOR PRODUCING SAME, AND POWER STORAGE DEVICE USING TITANATE COMPOUND AND ALKALI METAL TITANATE COMPOUND AS ACTIVE MATERIAL

摘要

A titanic acid compound is provided that can further increase the capacity of the power storage device when used as an electrode active material. The titanic acid compound according to the present invention has a specific surface area of 10 to 30 m 2 / g as measured by the BET point method by nitrogen adsorption and has an anisotropic shape and has a major axis diameter (L) RTI ID = 0.0 %, / RTI based on the number of particles. The method for producing a titanic acid compound of the present invention comprises a step of milling an alkali metal titanate compound until the specific surface area becomes 10 m 2 / g or more, a step of annealing the obtained milling product, and a step of bringing the titanic acid alkali metal compound into contact with an acidic aqueous solution And replacing at least a portion of the alkali metal cations in the alkali metal titanate with a proton. The method also comprises a step of heating the proton-substituted titanic acid compound.