NASICON-structured Ti-based polyanion compounds benefit from a stable structural framework, large ion channels, and fast ion mobility. However, the large radius of potassium and its poor electronic conductivity restrict its use in potassium-ion batteries. Herein, hierarchical mesoporous MnTi(PO)@C microspheres have been successfully synthesized using a simple electrospraying method. These microspheres consist of MnTi(PO) nanoparticles evenly embedded in three-dimensional mesoporous carbon microspheres. The hierarchical mesoporous micro/nanostructure facilitates the rapid insertion and extraction of K, while the three-dimensional carbon microspheres matrix enhances electrical conductivity and prevents active materials from collapsing during cycling. So the hierarchical mesoporous MnTi(PO)@C microspheres exhibit a high reversible discharge specific capacity (306 mA h g at 20 mA g), a notable rate capability (123 mA h g at 5000 mA g), and exceptional cycle performance (148 mA h g at 500 mA g after 1000 cycles). The results show that electrosprayed MnTi(PO)@C microspheres are a promising anode for PIBs.
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http://dx.doi.org/10.1016/j.jcis.2023.12.122 | DOI Listing |
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