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Highly uniform Ni(HCO3)2 spheres: the morphology evolution and electrochemical performance.

Cuixia Cheng1, Fang Chen1, Huiyang Yi1

  • 1Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi 435002, Hubei, P. R. China. Chengcx@hbnu.edu.cn.

Dalton Transactions (Cambridge, England : 2003)
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Summary

Nickel bicarbonate spheres offer enhanced performance for lithium-ion batteries and supercapacitors. This study details a simple hydrothermal synthesis method for these advanced energy storage materials.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Nickel bicarbonate (Ni(HCO3)2) is a promising electrode material for energy storage devices.
  • Optimizing morphology is key to enhancing electrochemical performance in batteries and supercapacitors.
  • Existing synthesis methods may not fully exploit the potential of nickel bicarbonate.

Purpose of the Study:

  • To synthesize nickel bicarbonate spheres using a facile one-step hydrothermal method.
  • To investigate the influence of hydrothermal duration on phase and morphology.
  • To evaluate the electrochemical performance of the synthesized material in lithium-ion batteries and supercapacitors.

Main Methods:

  • One-step hydrothermal synthesis of nickel bicarbonate spheres.
  • X-ray Diffraction (XRD) for phase analysis.
  • Scanning Electron Microscopy (SEM) for morphological investigation.
  • Electrochemical testing in lithium-ion battery and supercapacitor configurations.

Main Results:

  • A novel phase conversion from NiCO3 to Ni(HCO3)2 was observed.
  • Hydrothermal duration significantly impacts the phase and morphology of the material.
  • Nickel bicarbonate spheres synthesized for 15 hours demonstrated high capacity (602.4 mA h g-1 in LIBs) and capacitance (450 F g-1 in SCs).
  • Excellent cycling stability was achieved for both applications.

Conclusions:

  • The one-step hydrothermal method is effective for synthesizing Ni(HCO3)2 spheres.
  • Morphology and phase control are crucial for optimizing electrochemical properties.
  • Nickel bicarbonate spheres show significant potential for advanced energy storage applications.