Low-Concentration Electrolyte Engineering for Rechargeable Batteries

Area of Science:

• Electrochemistry
• Materials Science
• Energy Storage

Background:

• Low-concentration electrolytes (LCEs) are promising for rechargeable batteries due to cost, viscosity, and stability.
• Current research overlooks LCE-specific design principles and optimization strategies.
• Existing theories for concentrated electrolytes do not adequately address LCE challenges.

Purpose of the Study:

• To provide a systematic overview of recent progress in LCEs.
• To suggest development directions and tailored strategies for LCEs.
• To highlight challenges and solutions for LCEs in rechargeable batteries.

Main Methods:

• Review of recent literature on low-concentration electrolytes.
• Analysis of core challenges, including high solvent ratio and interface instability.
• Discussion of modification strategies like passivation and solvent-anion interaction optimization.

Main Results:

• Identified high solvent ratio as a key challenge in LCEs.
• Proposed strategies to mitigate unstable organic-enriched electrolyte/electrode interfaces.
• Demonstrated effectiveness of modification strategies in various rechargeable battery systems.

Conclusions:

• LCEs require tailored strategies distinct from concentrated electrolytes.
• Interface engineering and solvent-anion optimization are crucial for LCE performance.
• Advanced simulations and characterization are vital for understanding LCE failure mechanisms and future development.