Abstract
Graphene oxide-wrapped amorphous copper vanadium oxide is fabricated through a template-engaged redox reaction followed by vacuum dehydration. This material exhibits high reversible capacity, excellent rate capability, and out standing high-rate cyclability. The outstanding performance is attributed to the fast capacitive charge storage and the in situ formed copper with enhanced electrical conductivity.
Highlights
Vanadium belongs to the early transition metal elements
It is generally accepted that vanadium-based oxides react with lithium through the insertion reaction,[33,34] while other oxides, such as Fe2O3[35] and CuO[36,37] react with lithium through the conversion reaction
In order to achieve high energy density and good conductivity simutaneously, the rational design of multifunctional ternary metal oxides, in which vanadium acts as the primary redox active center providing multielectron redox reaction and copper as the secondary redox active center during reduction for enhanced elctrical conductivity, is another insightful route
Summary
Vanadium belongs to the early transition metal elements. It is generally accepted that vanadium-based oxides react with lithium through the insertion reaction,[33,34] while other oxides, such as Fe2O3[35] and CuO[36,37] react with lithium through the conversion reaction. The formation of mesopores might be attributed to the dehydration process during which the crystallized water is removed and the sheet is broken down.[23] No obvious diffraction rings or spots are observed in the selected area electron diffraction (SAED) pattern, indicating the amorphous nature (Figure S6, Supporting Information).
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