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Novel Alkaline Zn/Na

Tianci Yuan, Jiexin Zhang, Xiangjun Pu

  • 1Dong Guan McNair New Power Co., Ltd. Dongguan 523800 , China.

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|September 15, 2018
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Summary
This summary is machine-generated.

A new alkaline Zn-Na0.44MnO2 dual-ion battery offers improved cycling stability and rate capability for grid-scale energy storage. This rechargeable aqueous battery system demonstrates potential for cost-effective and safe energy solutions.

Keywords:
Na0.44MnO2Zn/Mn batteryalkaline aqueous electrolytefull cellstructural evolution

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Rechargeable aqueous Zn/Mn batteries are promising for large-scale energy storage due to abundant resources, low cost, and high safety.
  • However, MnO2's electrochemical instability in aqueous electrolytes limits their cycle life.
  • Developing stable and efficient cathode materials is crucial for advancing these systems.

Purpose of the Study:

  • To develop a novel alkaline Zn-Na0.44MnO2 dual-ion battery (AZMDIB) for improved energy storage performance.
  • To investigate the charge-discharge mechanism and structural evolution of the Na0.44MnO2 cathode.
  • To evaluate the electrochemical performance, including capacity, rate capability, and cycling stability, of the AZMDIB.

Main Methods:

  • Fabrication of an AZMDIB using Na0.44MnO2 as the cathode, zinc metal as the anode, and a 6 M NaOH aqueous electrolyte.
  • Electrochemical characterization including galvanostatic cycling across extended and narrower voltage windows.
  • Analysis of charge-discharge mechanisms and structural changes using electrochemical techniques.

Main Results:

  • The Na0.44MnO2 cathode delivered a high capacity of 345.5 mA h g-1 when discharged to 0.3 V, but exhibited poor cycling performance.
  • Two electrochemical processes were identified: reversible Na+ ion insertion/extraction (1.95-1.1 V) and an irreversible phase transition to Mn(OH)2 below 1.1 V, attributed to proton insertion.
  • In a narrower voltage range (2.0-1.1 V), the AZMDIB demonstrated a high reversible capacity (80.2 mA h g-1 at 0.5 C), excellent rate capability (32 mA h g-1 at 50 C), and stable cycling (73% retention over 1000 cycles at 10 C).

Conclusions:

  • The AZMDIB shows significant potential for grid-scale energy storage, offering a balance of performance and stability within an optimized voltage window.
  • The identified irreversible reaction below 1.1 V highlights the importance of controlling the operating potential to ensure long-term cyclability.
  • The rechargeable AZMDIB presents an environmentally friendly and cost-effective alternative for large-scale energy storage applications.