The invention relates to a porous metallic
cathode material doped with
lithium manganate / carbon for composite
lithium batteries, and a preparation method of the porous metallic cathodmaterial. The preparation method comprises the following steps: dissolving a surfactant in absolute ethyl
alcohol, and stirring the surfactant and the absolute ethyl
alcohol so as to obtain gel; adding
lithium nitrate, and
nitrate mixed with
metal nitrate and
manganese in the obtained gel, and performing uniform stir; after uniformly mixing,
drying the mixture in a blast
drying box, and further calcining the dried mixture in a
muffle furnace so as to obtain the porous material doped with lithium
manganate LiM0.2Mn1.8O4; dissolving the LiM0.2Mn1.8O4 in glucose solution, enabling the LiM0.2Mn1.8O4 to uniformly disperse, and after performing
air blast drying, calcining the dried product in
nitrogen atmosphere so as to obtain the metallic
composite material LiM0.2Mn1.8O4 / C doped with lithium
manganate / carbon, wherein M refers to the doped
metal. Compared with the prior art, the porous metallic
cathode material prepared through the preparation method disclosed by the invention has the advantages that the crystallizing property is good, the particle size is about 20nm, and the material has good
specific discharge capacity, rate capability and
cycling properties as the
cathode material for lithium batteries. The preparation idea of the preparation method disclosed by the invention can be applied to the preparation of other cathode materials of composite materials of porous metallic oxides.