Mechanisms, development, and applications of silicon-based anodes in solid state batteries.

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Silicon anodes offer high energy density for next-generation batteries.
• Solid-state batteries (SSBs) promise enhanced safety and performance over conventional lithium-ion batteries (LiBs).
• Silicon-based anodes are critical for achieving high-energy-density SSBs.

Purpose of the Study:

• To systematically review research on silicon-based anodes in SSBs.
• To analyze electrochemical processes, structural evolution, and failure mechanisms of silicon anodes.
• To summarize the status of various solid electrolyte types in silicon anode systems.

Main Methods:

• Literature review of technological development pathways.
• Analysis of electrochemical performance and degradation mechanisms.
• Synthesis of research on polymer, oxide, sulfide, halide, and composite solid electrolytes.

Main Results:

• Silicon anodes in SSBs face challenges related to volume expansion and interface stability.
• Different solid electrolyte types (PSEs, OSSEs, SSSEs, HSSEs, CSEs) exhibit varying compatibility with silicon anodes.
• Understanding failure mechanisms is key to improving cycling stability and energy density.

Conclusions:

• Targeted research directions are proposed to overcome silicon anode limitations in SSBs.
• Silicon-based anode SSBs hold significant commercial potential for advanced energy storage.
• This review provides guidance for designing high-performance silicon-based SSBs and LiBs.