Semi-Solid Flow Batteries: Fundamentals, Recent Advances, and Future Perspectives

Area of Science:

• Electrochemistry
• Materials Science
• Colloidal Science
• Fluid Mechanics

Background:

• Renewable energy intermittency necessitates large-scale energy storage solutions.
• Semi-solid flow batteries (SSFBs) offer high energy density via semi-solid slurry electrolytes.
• A comprehensive understanding of SSFB slurry electrolytes is lacking, with limited dedicated reviews.

Purpose of the Study:

• To review and consolidate research on semi-solid flow batteries (SSFBs).
• To elucidate the components, physicochemical properties, and operational aspects of SSFB slurry electrolytes.
• To identify key challenges and future research directions for SSFB technology.

Main Methods:

• Systematic review of existing SSFB research.
• Analysis of slurry electrolyte components: active materials, conductive additives, surfactants, and electrolytes.
• Examination of slurry physicochemical properties: stability, rheology, and conductivity.
• Evaluation of operating modes, electrochemical performance, and technical challenges.
• Emphasis on recent advances in electrode materials, transport kinetics, and reactor design.

Main Results:

• Detailed summary of SSFB slurry electrolyte constituents and their functions.
• Explanation of the interplay between slurry properties and regulatory mechanisms.
• Overview of SSFB operating principles, performance metrics, and current limitations.
• Highlighting of progress in materials, kinetics, and reactor engineering.

Conclusions:

• SSFBs represent a promising energy storage technology due to their high energy density.
• Further research is needed in materials modification, precise slurry property control, reactor scaling, and standardized characterization.
• Consolidating multi-disciplinary knowledge is crucial for accelerating SSFB technology maturation and industrial application.