Electrolytes for Aluminum-Ion Batteries: Progress and Outlook

Area of Science:

• Electrochemistry
• Materials Science
• Energy Storage

Background:

• Aluminum-ion batteries (AIBs) are attractive due to high theoretical capacity, safety, and low cost.
• Despite theoretical advantages, commercialization of AIBs is hindered by electrolyte challenges.
• Current electrolytes often fail to support the critical Al³⁺/Al three-electron transfer.

Purpose of the Study:

• To review recent advancements in electrolytes for AIBs.
• To identify limitations of existing AIB electrolytes.
• To provide guidance for enhancing AIB performance through electrolyte modification.

Main Methods:

• Comprehensive literature review of AIB electrolyte research.
• Analysis of electrolyte properties and their impact on battery performance.
• Discussion of electrolyte modification strategies.

Main Results:

• Identified significant limitations in current AIB electrolyte choices.
• Highlighted specific electrolyte types and their respective advantages and disadvantages.
• Detailed various strategies for electrolyte improvement.

Conclusions:

• Electrolyte development is crucial for realizing the potential of AIBs.
• Overcoming current electrolyte limitations is key to commercializing safe and efficient aluminum-ion batteries.
• Future research should focus on novel electrolytes facilitating efficient Al³⁺/Al redox reactions.