Non-aqueous Liquid Electrolyte Additives for Sodium-Ion Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Sodium-ion batteries (SIBs) are a promising alternative to lithium-ion batteries due to abundant sodium resources, lower cost, and enhanced safety.
• The electrolyte is critical for SIB performance, influencing coulombic efficiency, energy density, and cycle life.

Purpose of the Study:

• To review the fundamentals of sodium-ion battery electrolytes, including electrode-electrolyte interfaces and solvation structures.
• To discuss the mechanisms of various electrolyte additives in improving SIB performance.
• To provide insights into future research directions for SIB electrolytes.

Main Methods:

• Literature review of scientific publications on sodium-ion battery electrolytes.
• Analysis of fundamental principles governing electrolyte behavior and performance.
• Categorization and discussion of different types of electrolyte additives and their functions.

Main Results:

• Electrolyte composition and additives significantly impact SIB performance metrics.
• Film-forming, flame-retardant, and overcharge protection additives offer distinct benefits.
• Understanding electrode-electrolyte interfaces and solvation structures is crucial for electrolyte design.

Conclusions:

• Optimizing SIB electrolytes through functional additives is essential for advancing battery technology.
• Future research should focus on developing novel additives and understanding fundamental electrolyte mechanisms for practical applications.
• Electrolyte engineering holds significant potential for unlocking the full capabilities of sodium-ion batteries.