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release time:2024-11-13 Hits: Popular:AG11 battery
Research and development of cost-effective manganese-based anode materials that can improve the performance of 16340 battery
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 a high reversible specific capacity (battery capacity is 1237mAh/g when the current is 200?mA/g), excellent stability (battery capacity is 425mAh/g when the current is 4A/g) and extremely long cycle life (current is 4A/g, after 3000 cycles, there is no obvious capacity decay). In theory, transition metal oxides have high capacity and low cost, and are very promising anode candidate materials. Among this type of material, Mn3O4 has abundant reserves, is not easy to oxidize, and is competitive in electrochemistry. As a battery anode material, it has good prospects and is also widely used in various battery material research. However, transition metal oxides have encountered several problems in becoming anode materials for lithium-ion batteries (LIBs): First, the intrinsic poor conductivity of metal oxides limits the electron transport of the entire electrode, resulting in low utilization and low valuation of active materials. Second, the large volume shrinkage of metal oxides during lithiation and delithiation can lead to electrode pulverization, thereby accelerating capacity decay during cycle use. It is well known that nanoengineering and carbon hybridization are effective methods to overcome and limit such problems. The research team used solvothermal reaction to synthesize self-assembled manganese-based metal composites (Mn-MOC) with spherical structures. Then, the researchers converted the Mn-MOC precursor material into hierarchically 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 are composed of Mn3O4 nanocrystals covered with a uniformly distributed thin carbon shell. This nanostructure has a large reaction area, enhanced conductivity, and is easy to generate a stable solid electrolyte interface (SEI) formation and can adapt to the volume change of the conversion reaction type electrode.
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