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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)
|July 27, 2021
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.
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.
