A V<sup>4+</sup>-V<sub>2</sub>O<sub>5</sub> cathode with mixed vanadium valences was prepared via a novel synthetic method using VOOH as the precursor, and its zinc-ion storage performance was evaluated. The products are hollow spheres consisting of nanoflakes. The V<sup>4+</sup>-V<sub>2</sub>O<sub>...
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