Significance of particle morphology: Semi-single-crystalline O3-Type Na[Ni1/3Fe1/3Mn1/3]O2 cathode for practical Na-ion batteries

Le résumé fourni par la source

O3-type Na[Ni 1/3 Fe 1/3 Mn 1/3 ]O 2 (O3-NFM) has been widely regarded as a promising cathode material for practical Na-ion batteries (NIBs) owing to its low cost and high reversible capacity. To advance the practical application of O3-NFM cathodes in NIBs, an effective strategy is to enhance electrochemical stability under high-voltage operation by modulating particle morphology. This study investigates the effect of particle morphology in O3-NFM—specifically, three distinct types: polycrystalline, single-crystalline, and semi-single-crystalline—to optimize the cycle life and energy density of NIBs under a practical capacity loading of 4 mAh cm −2 and a high-voltage operation of 4.2 V (vs. Na/Na + ). Through a combination of experimental and computational analyses, the structural and interfacial properties of the cathode materials, including phase transitions, lattice strain, and the cathode–electrolyte interphase, were systematically characterized. By taking unique physicochemical features, the semi-single-crystalline NFM cathode demonstrates a great practical applicability with delivering high reversible capacity and excellent cycling stability.

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