Researchers at the University of Akron in the United States have developed Mn3O4/C graded porous nanospheres and used them as anode materials for lithium-ion batteries. These types of nanospheres have a higher reversible specific capacity (200 mA/g current, the battery Capacity of 1237mAh/g), Excellent stability (425mAh/g battery capacity at 4A/g current) and extremely long cycle life (current 4A/g, 3000 cycles, no use Obvious capacity fade).
Theoretically, the transition metal oxide has high capacity and low cost, and is a promising anode candidate material. Among such materials, Mn3O4 is rich in storage, is not easily oxidized, and is electrochemically competitive as a battery. Anode materials have a good prospect and are also widely used in the research of various types of battery materials.
However, transition metal oxides can become anode materials for lithium-ion battery (LIBs), and several problems have also been encountered: First, the inherent poor conductivity of metal oxides limits the electron transport throughout the electrode, resulting in low utilization of active materials. The low appraisal rate. Secondly, the large volume shrinkage of metal oxides during lithiation and delithiation can lead to electrode comminution, thereby accelerating capacity decay during recycling. It is well known that nanoengineering and carbon hybrids are overcome and An effective way to limit such issues.
The research team used a solvothermal reaction to synthesize a self-assembled manganese-based metal complex (Mn-MOC) that has a spherical structure. The researchers then converted the Mn-MOC precursor material into porous layers by thermal annealing. Mn3O4/C nanospheres.
The researchers attributed the lithium storage capacity to the unique porous hierarchical structure of the nanospheres. The nanospheres consist of Mn3O4 nanocrystals, which cover a uniformly distributed thin carbon shell. This nanostructure has a larger reaction area and enhances conductivity, and The formation of a stable solid electrolyte interface (SEI) is easy to generate and can adapt to the volume change of the conversion reaction type electrode.