Preparation and Study of a Simple Three-Matrix Solid Electrolyte Membrane in Air.

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Science

Background:

• Solid-state lithium batteries offer enhanced safety and energy density.
• Polymer electrolytes are crucial for stable cycling but suffer from low ionic conductivity and high interfacial resistance.
• Developing advanced solid electrolytes is key to overcoming current limitations in battery technology.

Purpose of the Study:

• To prepare a composite solid electrolyte with high mechanical flexibility and non-flammability.
• To improve ionic conductivity and electrochemical stability for solid-state lithium batteries.
• To provide a viable alternative to liquid electrolytes in next-generation batteries.

Main Methods:

• Tertiary polymer polymerization to reduce crystallinity and enhance Li+ fluidity.
• Formation of a solpolymer solution with lithium salt for ion transport.
• Incorporation of an inorganic solid electrolyte into the polymer matrix.
• Fabrication and testing of a composite solid electrolyte-based lithium battery.

Main Results:

• Achieved a Li+ conductivity of 3.18 × 10^-4 mS cm^-1 in the composite solid electrolyte.
• Demonstrated a capacity retention rate of 98.4% after 100 cycles for the LNMO/SPLL/Li battery.
• Observed significantly improved performance compared to batteries without inorganic oxides.

Conclusions:

• The developed composite solid electrolyte exhibits excellent mechanical flexibility and non-flammability.
• The composite structure effectively enhances ionic conductivity and interfacial stability.
• This work offers a promising reference for the development of high-performance all-solid-state batteries.