Fast-kinetic multivalent ion storage enabled by multiscale structural modulation in two-dimensional magnetic materials.
basic_science · Level V
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- Record sourced from PubMed, PMID 42009669.
- Also identified by DOI 10.1038/s41467-026-71942-7.
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Abstract
Rechargeable multivalent ion batteries represent a promising avenue for high-energy-density storage; however, their practical application is plagued by sluggish multivalent ion diffusion kinetics in the host materials. Here we propose a multiscale structural modulation strategy based on two-dimensional magnetic materials to enhance the multivalent ion storage kinetics. Using two-dimensional ferromagnetic Ti<sub>0.6</sub>Fe<sub>0.4</sub>O<sub>2</sub> nanosheets as a model system, we show that Fe-induced spin-polarized interactions reduce the surface migration barrier of the multivalent ions, improving the microscopic transport kinetics; meanwhile, the ferromagnetism enables magnetic-field-induced assembly of vertically aligned, low-tortuosity nanosheet electrodes that shorten the mesoscopic diffusion pathways. This strategy accelerates multivalent-ion migration, enabling nonaqueous Mg- and Al-ion batteries to achieve specific powers of ~18.2 and 15.7 kW kg<sup>-1</sup> based on electrodes, nearly two orders of magnitude higher than those of state-of-the-art multivalent batteries. This strategy can be extended to various two-dimensional magnetic materials, thereby providing a potentially universal methodology in designing fast-kinetic multivalent-ion batteries.