MANGANESE OXIDE AND METHOD FOR PRODUCING SAME, AND METHOD FOR PRODUCING LITHIUM MANGANESE COMPOSITE OXIDE USING SAME

There is provided manganese oxide having a pore volume fraction of no greater than 20% for pores with diameters of 10 µm or greater, as measured by mercury porosimetry, and a tap density of 1.6 g/cmor greater, and a method for producing it. There is also provided a method for producing a lithium manganese composite oxide using the manganese oxide.