Aluminum-doped cobalt(II,III) oxide and preparation method and application thereof

The invention discloses a preparation method of aluminum-doped cobalt(II,III) oxide, comprising the steps of (1) mixing aluminum salt solution and a complexing agent to obtain a mixed liquid; (2) adding cobalt salt solution, a precipitating agent solution containing carbonate ions and the mixed liquid of step (1) into a reaction device in concurrent manner, and co-precipitating to obtain aluminum-doped cobalt carbonate; (3) calcining the aluminum-doped cobalt carbonate of step (2) to obtain the aluminum-doped cobalt(II,III) oxide. The three solutions are fed in concurrent manner, so that the problem is solved that the process of preparing aluminum-doped cobalt(II,III) oxide by liquid co-precipitating experiences great differences between precipitating speeds of various elements; the prepared aluminum-doped cobalt(II,III) oxide has uniform distribution of elements, and the doping quantity of aluminum in the aluminum-doped cobalt(II,III) oxide can be significantly increased to 0.3-0.6%. 本发明公开了种铝元素掺杂四氧化三钴的制备方法，包