The invention discloses an aluminum-doped
spinel manganese-based material and a preparation method thereof. The method comprises the steps of respectively putting configured
manganese source compound solution, or a
nickel source compound, aluminum salt compound solution and a precipitator solution into a reactor according to the flow rate being 0.5-2L / h, stirring to control the pH value of a
system to be 7-8.5 and the
heating temperature of the
system to be 30 DEG C-60 DEG C, heating and then curing for 10h-20h to obtain a spherical precipitate precursor, washing and
drying the spherical precipitate precursor;
forging the dried precipitate for 5-20h under the temperature being 600-900 DEG C; and sufficiently mixing oxidizing materials and a
lithium source compound according to a proportion that the stoichiometric ratio exceeds the
lithium source compound by 1-10%, and
forging for 5-20h under the temperature being 600-900 DEG C to obtain the modified
spinel manganese-based material. According to the method disclosed by the invention, the feature of the precursor and the
distribution uniformity of an
Al element can be improved effectively; due to the reasonable high
forging temperature and
doping proportion, the structure stability of the aluminum-doped
spinel manganese-based material can be improved greatly, and the circulation performance and high-temperature and low-temperature performances of the material can be improved; and the process is simple, and the
repeatability is good.