Formation of hierarchical LiMn sub( 2)O sub( 4) dual-porous nanostructures by pyrolysis of gel precursor

In this paper, a precursor-pyrolysing route to fabricate hierarchical LiMn2O4 porous nanostructures is presented. The product was characterised by an X-ray powder diffraction, a scanning electron microscopy, a transmission electron microscope, a high-resolution transmission electron microscope and a micromeritics analyser. The results show that the resulting material is a honeycomb-like dual-porous structure. One is quasi-hemispherical macropores of several hundred nanometres and the other is slit mesopores of several nanometres. This dual-porous nanostructure is composed of many ultrafine nanocrystallines whose size mainly falls into the range from 3 nm to 10 nm. Moreover, it has a large Brunauer-Emmett-Teller-specific surface area of 116 m super( 2)/g. The formation of such dual pores should be attributed to the Kirkendall effect and surface diffusion.