Abstract
HighlightsHollow V4+-V2O5 nanospheres are prepared by a novel and simple method using VOOH as the precursor.V4+-V2O5 with mixed vanadium valences is firstly constructed as an electrochemically active cathode for aqueous zinc-ion batteries.The V4+-V2O5 cathode exhibits a prominent cycling performance up to 1000 cycles and an excellent rate capability.
Highlights
Significant achievements have been made for the high energy density and long-cycle-life lithium-ion batteries practical applications, the limited lithium supply, high cost, and low safety impede their further development in large-scale energy storage [1,2,3,4], motivating us to find an alternative battery chemistry
The precursor VOOH was prepared via suction filtration and was dried at 50 °C in vacuum. V4+-V2O5 was obtained by annealing the precursor in air atmosphere for 6 h at 250 °C with a heating rate of 2 °C min−1. V2O5 with pure pentavalent vanadium can be obtained at temperatures above 300 °C
It is reported that V2O5 is a promising cathode for aqueous zinc-ion batteries (ZIBs) [22, 34, 40, 41]
Summary
Significant achievements have been made for the high energy density and long-cycle-life lithium-ion batteries practical applications, the limited lithium supply, high cost, and low safety impede their further development in large-scale energy storage [1,2,3,4], motivating us to find an alternative battery chemistry. As a result of the multiple electrons involved in redox reactions, aqueous multivalent ion battery systems possess higher energy density
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