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Oxocarbon Salts for Fast Rechargeable Batteries.

Qing Zhao1, Jianbin Wang1, Yong Lu1

  • 1Key Laboratory of Advanced Energy Materials Chemistry and State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China.

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|September 9, 2016
PubMed
Summary

New oxocarbon salts were developed as electrodes for rechargeable Li, Na, and K-ion batteries. The K2C6O6 electrode demonstrated ultrafast potassium-ion performance, paving the way for rapid potassium-ion batteries.

Keywords:
batterieselectrodesmolecular engineeringrenewable materialssustainable chemistry

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Rechargeable batteries are crucial for energy storage.
  • Developing efficient electrodes for Li, Na, and K-ion batteries is an active research area.
  • Oxocarbon materials offer potential as battery electrodes due to their tunable structures.

Purpose of the Study:

  • To design and synthesize novel oxocarbon salts for use as electrodes in rechargeable ion batteries.
  • To investigate the electrochemical performance of these oxocarbon salts in Li, Na, and K-ion battery systems.
  • To explore the potential of potassium-based oxocarbon materials for high-performance potassium-ion batteries.

Main Methods:

  • One-pot proton exchange reactions were employed to synthesize oxocarbon salts (M2(CO)n).
  • Electrochemical performance was evaluated using Li, Na, and K-ion battery setups.
  • Material properties, including band gap and ionic conductivity, were analyzed.

Main Results:

  • Oxocarbon salts M2(CO)5 and M2(CO)6 exhibited reversible insertion of two or four metal ions.
  • The K2C6O6 electrode showed exceptional ultrafast potassium-ion insertion/extraction capabilities (212 mAh g⁻¹ at 0.2 C, 164 mAh g⁻¹ at 10 C).
  • A potassium-ion battery utilizing K2C6O6 as cathode and K4C6O6 as anode demonstrated a rocking-chair mechanism with 1.1 V operation and 35 Wh kg⁻¹ energy density.

Conclusions:

  • Oxocarbon salts are promising electrode materials for rechargeable ion batteries.
  • K2C6O6 exhibits excellent electrochemical properties for fast potassium-ion storage.
  • This research presents a viable strategy for developing rapid potassium-ion batteries using abundant potassium resources.