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. The reversible specific capacity of this kind of nanosphere is higher (the battery capacity is 1237mAh/g when the current is 200 mA/g), and it has excellent stability (the current capacity is 4A/g, the battery capacity is 425mAh/g) and extremely long The cycle life (current is 4A/g, after 3,000 cycles, there is no significant capacity decay).
Theoretically, transition metal oxides have high capacity and low cost, and are promising anode candidate materials. In this type of material, Mn3O4 is abundant in storage, difficult to oxidize, and electrochemically competitive. As a battery anode material, Mn3O4 has a good prospect and is also widely used in the research of various types of battery materials.
However, transition metal oxides can be used as anode materials for lithium ion batteries (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. Valuable. Second, the large volume shrinkage of metal oxides during lithiation and delithiation can lead to electrode comminution, thereby accelerating capacity decay during the cycle of use. As we all know, nano-engineering and carbon hybridization are effective ways to overcome and limit such problems.
The team used solvothermal reactions to synthesize a self-assembled manganese-based metal complex (Mn-MOC), which has a spherical structure. Then, the researchers transformed the Mn-MOC precursor material into porous Mn3O4/C nanospheres by thermal annealing.
The researchers attributed the lithium storage capacity to the unique porous hierarchical structure of the nanospheres. The nanospheres consist of Mn3O4 nanocrystals, which cover uniformly distributed thin carbon shells. The nanostructure reaction area is large, the conductivity is enhanced, and the formation of stable solid electrolyte interface (SEI) is easy to generate and can adapt to the volume change of the conversion reaction type electrode.
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