Advancements and Challenges in Organic-Inorganic Composite Solid Electrolytes for All-Solid-State Lithium Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Lithium-ion batteries face limitations in energy density and safety.
• All-solid-state lithium batteries (ASSLBs) with solid-state electrolytes (SEs) are emerging alternatives.
• Organic-inorganic composite solid electrolytes (OICSEs) combine polymer and inorganic material advantages for potential large-scale use.

Purpose of the Study:

• To provide a comprehensive review of recent research on OICSEs.
• To systematically discuss the influence of inorganic fillers on OICSE functional parameters.
• To analyze lithium-ion conduction mechanisms and categorize inorganic filler types.

Main Methods:

• Literature review of OICSE research.
• Systematic discussion of inorganic filler effects on ionic conductivity, Li+ transfer number, mechanical strength, electrochemical stability, electronic conductivity, and thermal stability.
• Analysis of lithium-ion conduction mechanisms from a microscopic perspective.
• Categorization of inert and active inorganic fillers based on structure-performance relationships.

Main Results:

• Inorganic fillers significantly influence OICSE properties, including ionic conductivity and stability.
• Understanding filler structure-performance relationships is crucial for optimizing OICSEs.
• Advanced characterization techniques are essential for evaluating OICSEs.

Conclusions:

• OICSEs show great potential for ASSLBs but face challenges in ionic conductivity and interfacial stability.
• Tailoring inorganic filler design is key to overcoming limitations.
• Further research and advanced characterization are needed for superior ASSLB development.