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Optimizing electrolyte composition proportion is key for high-performance lithium-ion batteries. This study developed a new method balancing aluminum foil protection and battery performance, enhancing cycle life and capacity.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Optimizing electrolyte formulation is crucial for high-performance lithium-ion batteries.
  • Traditional methods focus on electrolyte type, neglecting composition proportion optimization.
  • Balancing aluminum foil corrosion inhibition and electrochemical performance is a key challenge.

Purpose of the Study:

  • To optimize the composition proportion of a specific electrolyte formulation.
  • To enhance the electrochemical performance and cycle life of lithium-ion batteries.
  • To investigate the impact of electrolyte optimization on aluminum foil corrosion.

Main Methods:

  • Utilized the simplex method for optimization.
  • Applied normalization techniques to electrolyte composition data.
  • Conducted electrochemical testing to evaluate performance.
  • Analyzed the composition of the cathode electrolyte interphase (CEI).

Main Results:

  • An optimized electrolyte formulation (LiFSI0.53-LiBOB0.35-EC/DEC/EMC) was determined.
  • A lithium iron phosphate cathode with the optimized electrolyte achieved high capacity (143.1 mAh g⁻¹ at 0.5C).
  • Remarkable cycle life was observed (94.9% retention after 100 cycles at 45 °C).
  • The CEI layer contained solid and dense LiF, AlF3, B2O3, and Li2CO3.

Conclusions:

  • The developed optimization method effectively balances electrolyte properties.
  • The optimized electrolyte significantly improves lithium-ion battery performance.
  • The findings offer a new approach for future electrolyte formulation development.