Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.156
Publication date: 18th July 2023
The development of high voltage and high capacity Na-ion cathodes is one of the key challenges for the successful realization of high energy density sodium ion batteries.1 Among the Na-ion cathodes explored so far, NASICON-Na3V2(PO4)3 cathode is attractive because of its high intercalation voltage (3.45 V vs. Na+/Na0), moderate capacity (~120 mAh g-1) and excellent rate capability. Further, other cations are substituted in the place of vanadium of the NVP lattice to seek the participation multiple redox centres, thereby enhancing intercalation capacities. Recently, our group has developed a series of Na3V2(PO4)3-type cathode in which vanadium cations are partially replaced by different cations such as Mn2+, Mg2+, Al3+ and In3+.2-3 The Mn-rich Na3.75V1.25Mn0.25(PO4)3 cathode has displayed highest capacity and rate performances (100 and 89 mAh g-1 at 1 and 5C rates, respectively) due to its modulated V- and Mn-redox centers and optimum bottleneck size. The substitution of Mg2+ and Al3+ into the Na3VMn(PO4)3-type cathode has enhanced its rate performances and cycling stability. The In-substituted Na3VIn(PO4)3 cathode has exhibited asymmetric multi-redox V5+/V4+/V3+ operation during Na-ion (de)intercalation reaction. During the talk, we will highlight the importance of chemical tunning to enhance the electrochemical performances of NASICON cathodes.
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