Patent ID: 8895188

Claim:
An electrode material comprising: an active material comprising a titanium oxide compound having a monoclinic titanium dioxide crystal structure; and a compound which exists on a surface of the active material and has a trialkylsilyl group represented by the formula (I): wherein, R 1 , R 2 and R 3 , which may be the same or different, respectively represent an alkyl group having 1 to 10 carbon atoms; wherein the compound having the trialkylsilyl group is at least one selected from phosphoric acid compounds containing the trialkylsilyl group and boric acid compounds containing the trialkylsilyl group; and when a surface of the electrode material is measured by time-of-flight type secondary ion mass-analysis method, a peak intensity ratio (I 1 /I 2 ) satisfies the equation (II): 3.30 ≦I 1 /I 2 (II) wherein I 1 is a peak intensity of Si(CH 3 ) 3 + and I 2 is a peak intensity of Ti + .