Method for preparing lithium manganate used as lithium ion battery anode material by using trimanganese tetroxide

The invention discloses a method for preparing lithium manganate used as a lithium ion battery anode material by using trimanganese tetroxide, comprising the following steps of: firstly, preparing the trimanganese tetroxide and the lithium salt according to the molar ratio of lithium to manganese 0.5-0.6, uniformly mixing the trimanganese tetroxide and the lithium salt to get the precursor, and then, pre-sintering the precursor; executing ball milling and spray drying after pre-sintering, and then, executing secondary sintering; finally, executing isostatic cool pressing on the products of the secondary sintering process, and crashing and classifying the products to get the lithium manganate used as the lithium ion battery anode material. The method has the advantages of being simple and practical in technical steps, low in cost, easy to realize mass industrial production, excellent in product performance, and the like.