Designing a Magnesium/Sodium Hybrid Battery Using Hierarchical Iron Selenide Architecture as Cathode Material and Modified Dual-Ion Salts in Ether as Electrolyte.
basic_science · Level V
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- Record sourced from PubMed, PMID 38568187.
- Also identified by DOI 10.1021/acs.nanolett.4c00041.
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Abstract
We developed a magnesium/sodium (Mg/Na) hybrid battery using a hierarchical disk-whisker FeSe<sub>2</sub> architecture (HD-FeSe<sub>2</sub>) as the cathode material and a modified dual-ion electrolyte. The polarizable Se<sup>2-</sup> anion reduced the Mg<sup>2+</sup> migration barrier, and the 3D configuration possessed a large surface area, which facilitated both Mg<sup>2+</sup>/Na<sup>+</sup> cation diffusion and electron transport. The dual-ion salts with NaTFSI in ether reduced the Mg plating/stripping overvoltage in a symmetric cell. The hybrid battery exhibited an energy density of 260.9 Wh kg<sup>-1</sup> and a power density of 600.8 W kg<sup>-1</sup> at 0.2 A g<sup>-1</sup>. It showed a capacity retention of 154 mAh g<sup>-1</sup> and a Coulombic efficiency of over 99.5% under 1.0 A g<sup>-1</sup> after 800 long cycles. The battery also displayed outstanding temperature tolerance. The findings of 3D architecture as cathode material and hybrid electrolyte provide a pathway to design a highly reliable Mg/Na hybrid battery.