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Rechargeable Room-Temperature Na-CO2 Batteries.

Xiaofei Hu1,2, Jianchao Sun1,2, Zifan Li1,2

  • 1Key Laboratory of Advanced Energy Materials Chemistry, Ministry of Education.

Angewandte Chemie (International Ed. in English)
|April 19, 2016
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Rechargeable sodium-carbon dioxide (Na-CO2) batteries are now possible, offering high capacity and 200 cycles. This breakthrough enables efficient CO2 utilization and energy conversion.

Keywords:
3-dimensional porosityCO2 utilizationNa-CO2 batteriescathode designmulti-wall carbon nanotubes

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Developing rechargeable sodium-carbon dioxide (Na-CO2) batteries is crucial for CO2 utilization and energy conversion.
  • Existing Na-CO2 batteries in pure CO2 atmospheres are non-rechargeable with limited discharge capacity (200 mAh g⁻¹).

Purpose of the Study:

  • To achieve rechargeability in Na-CO2 batteries.
  • To demonstrate a novel reversible reaction for Na-CO2 batteries.
  • To enhance CO2 conversion and energy storage efficiency.

Main Methods:

  • Designed a Na-CO2 battery with a sodium anode, ether-based electrolyte, and a cathode of electrolyte-treated multi-wall carbon nanotubes.
  • Investigated the reversible reaction: 3CO2 + 4Na ↔ 2Na2CO3 + C.
  • Characterized battery performance, including capacity, cycling stability, and charge voltage.

Main Results:

  • Achieved rechargeability in a Na-CO2 battery with a reversible capacity of 60,000 mAh g⁻¹ at 1 A g⁻¹ (≈1000 Wh kg⁻¹).
  • Demonstrated stable cycling for 200 cycles with a controlled capacity of 2000 mAh g⁻¹ at a charge voltage below 3.7 V.
  • Attributed high performance to the cathode's porous structure, high electrical conductivity, and excellent electrolyte wettability, reducing electrochemical polarization.

Conclusions:

  • Successfully developed a rechargeable Na-CO2 battery, overcoming previous limitations.
  • The designed battery offers a promising pathway for efficient CO2 recycling and energy storage.
  • This work presents a viable alternative approach for clean CO2 utilization.