Engineering the interface of organic/inorganic composite solid-state electrolyte by amino effect for all-solid-state...

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Science

Background:

• Composite solid-state electrolytes (CSSE) offer advantages over traditional electrolytes for all-solid-state lithium batteries (ASSLB).
• Poor dispersion of inorganic fillers and organic/inorganic incompatibility at interfaces hinder CSSE performance.
• Interface engineering is crucial for developing stable and high-performance ASSLB.

Purpose of the Study:

• To improve the interface compatibility and stability of organic/inorganic CSSE.
• To enhance the electrochemical performance of ASSLB by modifying CSSE.
• To investigate the role of aminopropyl triethoxysilane (ATS) in tailoring CSSE interfaces.

Main Methods:

• Introduction of aminopropyl triethoxysilane (ATS) as a silane coupling agent (SCA) to modify CSSE.
• Utilizing the chemical bridging effect and amino group interactions (hydrogen bonding, lone pair electrons) of ATS.
• Characterization of interface properties, ionic conductivity, mechanical/thermal stability, and electrochemical performance of ASSLB.

Main Results:

• ATS enhances interface interaction between polyethylene oxide (PEO) and ceramic fillers via hydrogen bonding and lone pair electron effects.
• ATS promotes uniform dispersion of ceramic fillers and Li+ ion transport, inhibiting lithium dendrite formation.
• Modified CSSE exhibits high ionic conductivity, superior mechanical/thermal stability, and excellent ASSLB performance (140.9 mAh g-1 capacity, 94.4% retention over 280 cycles).

Conclusions:

• Aminopropyl triethoxysilane (ATS) effectively tailors organic/inorganic interfaces in CSSE, significantly improving stability and performance.
• The study provides a new strategy for enhancing the applicability of CSSE in all-solid-state lithium batteries (ASSLB).
• ATS-modified CSSE demonstrates promising potential for next-generation high-performance and safe lithium batteries.