Preparation and electrochemical performance of Al3 intercalated (NH4)2V10O25?8H2O cathode for aqueous zinc ion battery
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TM912

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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    Abstract:

    (NH4)2V10O25?8H2O(NVO) pure phase was synthesized by hydrothermal method with NH4VO3 as the vanadium source and C2H2O4?2H2O as the reducing agent. Al3 pre-intercalation modification Al(NO3)3?9H2O as aluminum source (Al-NVO). The phase and morphology of the material were characterized by XRD, SEM, TEM and EDS. The results show that Al3 is uniformly dispersed in the material, and the pre-embedding of Al3 changes the morphology of the material from the densely stacked sheet structure to the finer and more dispersed nanosheet structure. Electrochemical performance tests such as constant current charge and discharge, cyclic voltammetry (CV) and galvanostatic intermittent titration technique (GITT) showed that Al3 pre-embedding could effectively improve the capacity, rate performance and cyclic stability of the material. The initial discharge specific capacity of the sample Al-NVO material was 329 mAh/g at the current density of 0.5 A/g. After 100 cycles, the specific capacity was 252 mAh/g. At the current density of 2.0 A/g, the capacity is still 122.8 mAh/g after 1200 cycles, and the capacity retention rate is as high as 94.6 %. Through the calculation of cyclic voltammetry and pseudo capacitance at different scan rates, the interlayer pre-embedded Al3 effectively improves the diffusion kinetics of Zn2 and the electrochemical performance of the material.

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History
  • Received:September 07,2021
  • Revised:October 24,2021
  • Adopted:October 25,2021
  • Online: December 06,2021
  • Published:
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