New boron based salts for lithium-ion batteries using conjugated ligands

Area of Science:

• Materials Science
• Electrochemistry
• Computational Chemistry

Background:

• Development of advanced lithium salts is crucial for enhancing lithium-ion battery performance.
• Current lithium salts face limitations in solubility, ionic conductivity, and electrochemical stability.
• Novel anion designs are needed to overcome these challenges for next-generation batteries.

Purpose of the Study:

• To introduce a new anion design concept for alternative lithium salts in lithium-ion batteries.
• To evaluate the properties of novel boron-centered anions with conjugated ligands using computational methods.
• To assess key factors including cation-anion interaction strength, oxidation limits, and reduction stability.

Main Methods:

• Density Functional Theory (DFT) calculations were employed to design and evaluate novel anions.
• The study focused on boron-centered anions with various conjugated systems as ligands.
• Key properties analyzed included cation-anion interaction energy, oxidation potential, and reduction stability.

Main Results:

• Several novel anions demonstrated superior properties compared to existing lithium salts.
• Significantly low cation-anion interaction strengths were predicted, indicating enhanced solubility and ionic conductivity.
• The (1Z,3Z)-buta-1,3-diene-1,2,3,4-tetracarbonitrile ligand notably decreased lithium cation interaction energy.

Conclusions:

• The proposed anion design strategy is versatile and effective for developing advanced lithium salts.
• The novel anions show potential for improving lithium-ion battery performance, particularly in conductivity and stability.
• This approach opens new avenues for designing functional anions beyond boron-centered systems.