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Solution-chemistry-driven phase evolution enables high-voltage sodium storage
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DOI：10.1016/j.mtchem.2026.103901.png)
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Abstract
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• The phase composition of the products is highly sensitive to the Na/Li ratio. • Vanadium exists as V4+ in the precursor solution, and transforms into a mixed V2+/V3+/V4+ valence state in the products. • The Na/Li ratio regulates the local electrostatic environment and electronic structure of vanadium, affecting the change of NVP and NVPP phases. • The minor change in lattice parameters during charge-discharge, accompanied by a slight shift of V 2p1/2 and masking of V 2p3/2.
Keywords:
Valence state of vanadium
High voltage
Sodium-ion battery
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