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Colligative Properties of Electrolytes
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Concentrated electrolytes stabilize bismuth-potassium batteries.

Ruding Zhang1, Jingze Bao1, YuHuang Wang2

  • 1CAS Key Laboratory of Design and Assembly of Functional Nanostructures , Fujian Provincial Key Laboratory of Nanomaterials , Fujian Institute of Research on the Structure of Matter , Chinese Academy of Sciences , Fuzhou , Fujian 350002 , P. R. China .

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A concentrated ether-based electrolyte significantly improves bismuth anode performance in rechargeable potassium-ion batteries. This approach enhances stability and capacity retention for long-cycle-life energy storage applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Bismuth (Bi) is a promising anode material for potassium-ion batteries due to its high theoretical capacity.
  • Conventional electrolytes lead to poor electrochemical cyclability of bismuth anodes.
  • Developing stable electrolytes is crucial for advancing potassium-ion battery technology.

Purpose of the Study:

  • To investigate the effect of high concentration electrolytes on bismuth anode performance.
  • To improve the electrochemical cyclability and stability of bismuth anodes in potassium-ion batteries.
  • To explore a novel electrolyte strategy for high-performance potassium-ion battery development.

Main Methods:

  • Utilizing a 5 molar (M) ether-based electrolyte for bismuth anodes.
  • Comparing performance against conventional 1 M electrolytes.
  • Electrochemical testing including cycling stability, capacity retention, Coulombic efficiency, and rate capability.

Main Results:

  • The 5 M electrolyte effectively passivates the bismuth surface, enhancing reduction resistance.
  • The bismuth-carbon anode achieved high specific capacity and excellent electrochemical cyclability.
  • Over 600 cycles, 85% capacity retention and 99.35% average Coulombic efficiency were observed at 200 mA g⁻¹.
  • Improved rate capability and reduced potential hysteresis were demonstrated.

Conclusions:

  • High concentration electrolytes offer a viable strategy to overcome the limitations of bismuth anodes in potassium-ion batteries.
  • The "concentrated electrolyte" approach significantly enhances cycling life and stability.
  • This research provides new insights for developing long-cycle-life and high-safety potassium-ion batteries.