Preparation method of modified manganese-based lithium ion sieve

The invention discloses a modified manganese-based lithium ion sieve preparation method, which comprises: S01, mixing and grinding a lithium salt and a manganese oxide, placing into a homogeneous reactor, carrying out a reaction for 24-48 h, and drying and grinding the product after the reaction is completed to obtain LiMnO2 powder; s02, calcining the LiMnO2 powder for 1 to 8 hours at the temperature of between 300 and 600 DEG C, so as to obtain Li1. 6Mn1. 6O4 powder; s03, mixing and grinding the Li1. 6Mn1. 6O4 powder and NH4F, putting the mixture into a homogeneous reactor, and keeping the rotating speed of the homogeneous reactor at 1-5 revolutions per minute, the reaction temperature at 100-300 DEG C and the reaction time at 1-4 hours; modified powder is obtained; s04, carrying out acidizing treatment on the modified powder in inorganic acid for 12 to 24 hours; and after acidizing, centrifugally drying to obtain the modified manganese-based lithium ion sieve. The modified manganese-based lithium ion sieve