1.2V NiMH battery

　　US researchers developed Mn3O4/C hierarchical porous nanospheres and used them as anode materials for lithium-ion batteries

　　According to foreign media reports, researchers at the University of Akron in the United States have developed Mn3O4/C hierarchical porous nanospheres and used them as anode materials for lithium-ion batteries. This type of nanosphere has high reversible specific capacity (when the current is 200?mA/g, the battery capacity is 1237mAh/g), excellent stability (when the current is 4A/g, the battery capacity is 425mAh/g) and extremely long Cycling service life (current is 4A/g, after 3000 cycles of use, there is no obvious capacity attenuation).

　　In theory, transition metal oxides have high capacity and low cost, making them promising anode candidates. Among this type of materials, Mn3O4 has abundant reserves, is not easily oxidized, and is competitive in electrochemistry. As a battery anode material, it has good prospects and is widely used in the research of various battery materials.

　　However, transition metal oxides have encountered several problems when they can become anode materials for lithium-ion batteries (LIBs): First, the inherent poor conductivity of metal oxides limits electron transport throughout the electrode, resulting in low utilization of active materials. Valuation is low. Secondly, the large volume shrinkage and expansion of metal oxides during the lithiation and delithiation processes will cause the electrode to shatter, thereby accelerating capacity fading during cycle use. Nanoengineering and carbon hybridization are known to be effective methods to overcome and limit such problems.

　　The research team used solvothermal reaction to synthesize a self-assembled manganese-based metal composite (Mn-MOC), which has a spherical structure. The researchers then transformed the Mn-MOC precursor material into hierarchically porous Mn3O4/C nanospheres through thermal annealing treatment.

　　The researchers attribute the lithium storage ability to the unique porous hierarchical structure of the nanospheres. Nanospheres are composed of Mn3O4 nanocrystals covered with evenly distributed thin carbon shells. This nanostructure has a large reaction area, enhances conductivity, and is easy to form a stable solid electrolyte interface (SEI) and can adapt to volume changes of conversion reaction electrodes.

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