【摘 要】
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Ammonium vanadate has been considered as a competitive high-performance cathode material for aque-ous Zn-ion batteries. However, it still suffers from insufficient rate capability and poor cyclability due to the low electronic conductivity. Herein, (NH4)2
【机 构】
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School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;
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Ammonium vanadate has been considered as a competitive high-performance cathode material for aque-ous Zn-ion batteries. However, it still suffers from insufficient rate capability and poor cyclability due to the low electronic conductivity. Herein, (NH4)2V6O16·0.9H2O nanobelts with reduced graphene oxide (RGO) modification are synthesized by one-step hydrothermal reaction. Benefiting from the addition of RGO, an excellent electrochemical performance of (NH4)2V6O16·0.9H2O@RGO nanobelts can be obtained. The (NH4)2V6O16·0.9H2O@RGO displays a high-rate capacity and a high energy density of 386 Wh/kg at 72 W/kg. In particular, after 1000 cycles at 5 A/g, the capacity remains at 322 mAh/g with 92.8％capacity retention. In addition, the key reaction mechanisms of reversible Zn2+ insertion/extraction in (NH4)2V6O16·0.9H2O@RGO are clarified.
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