Solid-State Sodium-Ion Batteries: Theories, Challenges and Perspectives.

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Sodium-ion batteries (SIBs) are a cost-effective, sustainable alternative to lithium-ion batteries due to abundant sodium resources.
• Solid-state SIBs offer enhanced safety and energy density, showing promise for electric vehicles and grid storage.

Purpose of the Study:

• To systematically review the fundamental principles of solid-state sodium-ion batteries.
• To identify key scientific challenges hindering their commercialization, focusing on solid electrolytes.
• To explore interface modification techniques for improving solid-state electrolyte performance.

Main Methods:

• Comprehensive review of existing literature on solid-state sodium-ion battery technology.
• Analysis of working principles, electrode materials, and solid electrolyte characteristics.
• Discussion of interface modification strategies and their impact on performance.

Main Results:

• Identified low room-temperature ionic conductivity and high interfacial impedance as critical issues.
• Highlighted poor electrode-electrolyte compatibility as a significant barrier.
• Reviewed interface modification as a promising approach to overcome these challenges.

Conclusions:

• Solid-state sodium-ion batteries hold significant potential but require further research into solid electrolytes and interfaces.
• Interface engineering is crucial for enhancing ionic conductivity and reducing impedance.
• This review provides theoretical guidance for accelerating the development and industrial application of solid-state SIBs.