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Meeting MS&T25: Materials Science & Technology
Symposium Energy Materials for Sustainable Development
Presentation Title Tailoring MXene-derived bilayered vanadium oxides for high-performance energy storage in diverse ion systems
Author(s) Ekaterina Pomerantseva
On-Site Speaker (Planned) Ekaterina Pomerantseva
Abstract Scope MXene-derived bilayered vanadium oxides (BVOs) with chemically preintercalated cations unlock new pathways for high-performance energy storage across diverse battery chemistries. In lithium-ion batteries, chemically preintercalated V₂CTₓ-derived BVOs with nanoflower morphology exhibited the highest reported capacity retention among BVO cathodes. This performance was attributed to morphological stabilization from 2D nanosheet-based BVO nanoflowers formed by oxidizing MXene nanoflakes obtained via mild etching. In contrast, strongly etched, initially more oxidized MXenes produced 1D nanoparticle-based oxide nanoflowers with inferior stability as evidenced by cycling K-preintercalated V₂CTₓ-derived BVO electrode in K-ion cells. Oxides derived from solid-solution (NbyV₂–y)CTₓ MXenes demonstrated tunable redox activity dependent on Nb content. In aqueous Zn-ion batteries, nanoflower-like Zn-preintercalated BVOs exhibited highest specific capacity compared to MXene-derived BVO polymorphs preintercalated with other cations attributed to reversible by-product formation. Our results reveal how subtle control over MXene chemistry and transformation pathways governs electrochemical activity of MXene-derived oxides in next-generation battery materials.

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