Upgrading Electrolyte Antioxidant Chemistry by Constructing Potential Scaling Relationship.

Area of Science:

• Electrochemistry
• Materials Science
• Battery Technology

Background:

• High-voltage electrolytes are crucial for next-generation high-energy-density batteries.
• Limited understanding of electrolyte antioxidant chemistry hinders new electrolyte development.
• Lack of valid quantization approaches creates a knowledge gap in electrolyte formulation.

Purpose of the Study:

• To develop a method for quantifying the oxidation stability of ether-based electrolytes.
• To establish a correlation between electrolyte structure and oxidation potential.
• To design and optimize advanced electrolytes for high-voltage battery applications.

Main Methods:

• Constructed a standard curve based on solvation structures to quantify oxidation stability.
• Investigated the linear correlation between oxidation potential and atomic charge of the least oxidation-resistant solvent.
• Designed a (Trifluoromethyl)cyclohexane-based localized high-concentration electrolyte.

Main Results:

• Revealed a linear correlation between oxidation potential and atomic charge of the solvent.
• Demonstrated that electrolyte design based on solvation structure-oxidation potential regularity optimizes cycling performance.
• Achieved 80% capacity retention after 440 cycles in 4.5V Li||LiCoO2 batteries.

Conclusions:

• The proposed principles offer a fundamental guideline for evaluating and designing aggressive electrochemical systems.
• The developed quantization approach addresses the knowledge gap in electrolyte antioxidant chemistry.
• This work facilitates the rational design of advanced electrolytes for improved battery performance.